{"version":3,"file":"/pc/all/libs/knockout-latest.js.map","sources":["/pc/all/libs/knockout-latest.js"],"sourcesContent":["/*!\n * Knockout JavaScript library v3.4.0\n * (c) Steven Sanderson - http://knockoutjs.com/\n * License: MIT (http://www.opensource.org/licenses/mit-license.php)\n */\n\n(function(){\n    var DEBUG=true;\n    (function(undefined){\n        // (0, eval)('this') is a robust way of getting a reference to the global object\n        // For details, see http://stackoverflow.com/questions/14119988/return-this-0-evalthis/14120023#14120023\n        var window = this || (0, eval)('this'),\n            document = window['document'],\n            navigator = window['navigator'],\n            jQueryInstance = window[\"jQuery\"],\n            JSON = window[\"JSON\"];\n        (function(factory) {\n            // Support three module loading scenarios\n            if (typeof define === 'function' && define['amd']) {\n                // [1] AMD anonymous module\n                define(['exports', 'require'], factory);\n            } else if (typeof exports === 'object' && typeof module === 'object') {\n                // [2] CommonJS/Node.js\n                factory(module['exports'] || exports);  // module.exports is for Node.js\n            } else {\n                // [3] No module loader (plain <script> tag) - put directly in global namespace\n                factory(window['ko'] = {});\n            }\n        }(function(koExports, amdRequire){\n// Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).\n// In the future, the following \"ko\" variable may be made distinct from \"koExports\" so that private objects are not externally reachable.\n            var ko = typeof koExports !== 'undefined' ? koExports : {};\n// Google Closure Compiler helpers (used only to make the minified file smaller)\n            ko.exportSymbol = function(koPath, object) {\n                var tokens = koPath.split(\".\");\n\n                // In the future, \"ko\" may become distinct from \"koExports\" (so that non-exported objects are not reachable)\n                // At that point, \"target\" would be set to: (typeof koExports !== \"undefined\" ? koExports : ko)\n                var target = ko;\n\n                for (var i = 0; i < tokens.length - 1; i++)\n                    target = target[tokens[i]];\n                target[tokens[tokens.length - 1]] = object;\n            };\n            ko.exportProperty = function(owner, publicName, object) {\n                owner[publicName] = object;\n            };\n            ko.version = \"3.4.0\";\n\n            ko.exportSymbol('version', ko.version);\n// For any options that may affect various areas of Knockout and aren't directly associated with data binding.\n            ko.options = {\n                'deferUpdates': false,\n                'useOnlyNativeEvents': false\n            };\n\n//ko.exportSymbol('options', ko.options);   // 'options' isn't minified\n            ko.utils = (function () {\n                function objectForEach(obj, action) {\n                    for (var prop in obj) {\n                        if (obj.hasOwnProperty(prop)) {\n                            action(prop, obj[prop]);\n                        }\n                    }\n                }\n\n                function extend(target, source) {\n                    if (source) {\n                        for(var prop in source) {\n                            if(source.hasOwnProperty(prop)) {\n                                target[prop] = source[prop];\n                            }\n                        }\n                    }\n                    return target;\n                }\n\n                function setPrototypeOf(obj, proto) {\n                    obj.__proto__ = proto;\n                    return obj;\n                }\n\n                var canSetPrototype = ({ __proto__: [] } instanceof Array);\n                var canUseSymbols = !DEBUG && typeof Symbol === 'function';\n\n                // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)\n                var knownEvents = {}, knownEventTypesByEventName = {};\n                var keyEventTypeName = (navigator && /Firefox\\/2/i.test(navigator.userAgent)) ? 'KeyboardEvent' : 'UIEvents';\n                knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];\n                knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];\n                objectForEach(knownEvents, function(eventType, knownEventsForType) {\n                    if (knownEventsForType.length) {\n                        for (var i = 0, j = knownEventsForType.length; i < j; i++)\n                            knownEventTypesByEventName[knownEventsForType[i]] = eventType;\n                    }\n                });\n                var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406\n\n                // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)\n                // Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.\n                // Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.\n                // If there is a future need to detect specific versions of IE10+, we will amend this.\n                var ieVersion = document && (function() {\n                        var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');\n\n                        // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment\n                        while (\n                            div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',\n                                iElems[0]\n                            ) {}\n                        return version > 4 ? version : undefined;\n                    }());\n                var isIe6 = ieVersion === 6,\n                    isIe7 = ieVersion === 7;\n\n                function isClickOnCheckableElement(element, eventType) {\n                    if ((ko.utils.tagNameLower(element) !== \"input\") || !element.type) return false;\n                    if (eventType.toLowerCase() != \"click\") return false;\n                    var inputType = element.type;\n                    return (inputType == \"checkbox\") || (inputType == \"radio\");\n                }\n\n                // For details on the pattern for changing node classes\n                // see: https://github.com/knockout/knockout/issues/1597\n                var cssClassNameRegex = /\\S+/g;\n\n                function toggleDomNodeCssClass(node, classNames, shouldHaveClass) {\n                    var addOrRemoveFn;\n                    if (classNames) {\n                        if (typeof node.classList === 'object') {\n                            addOrRemoveFn = node.classList[shouldHaveClass ? 'add' : 'remove'];\n                            ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {\n                                addOrRemoveFn.call(node.classList, className);\n                            });\n                        } else if (typeof node.className['baseVal'] === 'string') {\n                            // SVG tag .classNames is an SVGAnimatedString instance\n                            toggleObjectClassPropertyString(node.className, 'baseVal', classNames, shouldHaveClass);\n                        } else {\n                            // node.className ought to be a string.\n                            toggleObjectClassPropertyString(node, 'className', classNames, shouldHaveClass);\n                        }\n                    }\n                }\n\n                function toggleObjectClassPropertyString(obj, prop, classNames, shouldHaveClass) {\n                    // obj/prop is either a node/'className' or a SVGAnimatedString/'baseVal'.\n                    var currentClassNames = obj[prop].match(cssClassNameRegex) || [];\n                    ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {\n                        ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);\n                    });\n                    obj[prop] = currentClassNames.join(\" \");\n                }\n\n                return {\n                    fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],\n\n                    arrayForEach: function (array, action) {\n                        for (var i = 0, j = array.length; i < j; i++)\n                            action(array[i], i);\n                    },\n\n                    arrayIndexOf: function (array, item) {\n                        if (typeof Array.prototype.indexOf == \"function\")\n                            return Array.prototype.indexOf.call(array, item);\n                        for (var i = 0, j = array.length; i < j; i++)\n                            if (array[i] === item)\n                                return i;\n                        return -1;\n                    },\n\n                    arrayFirst: function (array, predicate, predicateOwner) {\n                        for (var i = 0, j = array.length; i < j; i++)\n                            if (predicate.call(predicateOwner, array[i], i))\n                                return array[i];\n                        return null;\n                    },\n\n                    arrayRemoveItem: function (array, itemToRemove) {\n                        var index = ko.utils.arrayIndexOf(array, itemToRemove);\n                        if (index > 0) {\n                            array.splice(index, 1);\n                        }\n                        else if (index === 0) {\n                            array.shift();\n                        }\n                    },\n\n                    arrayGetDistinctValues: function (array) {\n                        array = array || [];\n                        var result = [];\n                        for (var i = 0, j = array.length; i < j; i++) {\n                            if (ko.utils.arrayIndexOf(result, array[i]) < 0)\n                                result.push(array[i]);\n                        }\n                        return result;\n                    },\n\n                    arrayMap: function (array, mapping) {\n                        array = array || [];\n                        var result = [];\n                        for (var i = 0, j = array.length; i < j; i++)\n                            result.push(mapping(array[i], i));\n                        return result;\n                    },\n\n                    arrayFilter: function (array, predicate) {\n                        array = array || [];\n                        var result = [];\n                        for (var i = 0, j = array.length; i < j; i++)\n                            if (predicate(array[i], i))\n                                result.push(array[i]);\n                        return result;\n                    },\n\n                    arrayPushAll: function (array, valuesToPush) {\n                        if (valuesToPush instanceof Array)\n                            array.push.apply(array, valuesToPush);\n                        else\n                            for (var i = 0, j = valuesToPush.length; i < j; i++)\n                                array.push(valuesToPush[i]);\n                        return array;\n                    },\n\n                    addOrRemoveItem: function(array, value, included) {\n                        var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.peekObservable(array), value);\n                        if (existingEntryIndex < 0) {\n                            if (included)\n                                array.push(value);\n                        } else {\n                            if (!included)\n                                array.splice(existingEntryIndex, 1);\n                        }\n                    },\n\n                    canSetPrototype: canSetPrototype,\n\n                    extend: extend,\n\n                    setPrototypeOf: setPrototypeOf,\n\n                    setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend,\n\n                    objectForEach: objectForEach,\n\n                    objectMap: function(source, mapping) {\n                        if (!source)\n                            return source;\n                        var target = {};\n                        for (var prop in source) {\n                            if (source.hasOwnProperty(prop)) {\n                                target[prop] = mapping(source[prop], prop, source);\n                            }\n                        }\n                        return target;\n                    },\n\n                    emptyDomNode: function (domNode) {\n                        while (domNode.firstChild) {\n                            ko.removeNode(domNode.firstChild);\n                        }\n                    },\n\n                    moveCleanedNodesToContainerElement: function(nodes) {\n                        // Ensure it's a real array, as we're about to reparent the nodes and\n                        // we don't want the underlying collection to change while we're doing that.\n                        var nodesArray = ko.utils.makeArray(nodes);\n                        var templateDocument = (nodesArray[0] && nodesArray[0].ownerDocument) || document;\n\n                        var container = templateDocument.createElement('div');\n                        for (var i = 0, j = nodesArray.length; i < j; i++) {\n                            container.appendChild(ko.cleanNode(nodesArray[i]));\n                        }\n                        return container;\n                    },\n\n                    cloneNodes: function (nodesArray, shouldCleanNodes) {\n                        for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {\n                            var clonedNode = nodesArray[i].cloneNode(true);\n                            newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);\n                        }\n                        return newNodesArray;\n                    },\n\n                    setDomNodeChildren: function (domNode, childNodes) {\n                        ko.utils.emptyDomNode(domNode);\n                        if (childNodes) {\n                            for (var i = 0, j = childNodes.length; i < j; i++)\n                                domNode.appendChild(childNodes[i]);\n                        }\n                    },\n\n                    replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {\n                        var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;\n                        if (nodesToReplaceArray.length > 0) {\n                            var insertionPoint = nodesToReplaceArray[0];\n                            var parent = insertionPoint.parentNode;\n                            for (var i = 0, j = newNodesArray.length; i < j; i++)\n                                parent.insertBefore(newNodesArray[i], insertionPoint);\n                            for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {\n                                ko.removeNode(nodesToReplaceArray[i]);\n                            }\n                        }\n                    },\n\n                    fixUpContinuousNodeArray: function(continuousNodeArray, parentNode) {\n                        // Before acting on a set of nodes that were previously outputted by a template function, we have to reconcile\n                        // them against what is in the DOM right now. It may be that some of the nodes have already been removed, or that\n                        // new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been\n                        // leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.\n                        // So, this function translates the old \"map\" output array into its best guess of the set of current DOM nodes.\n                        //\n                        // Rules:\n                        //   [A] Any leading nodes that have been removed should be ignored\n                        //       These most likely correspond to memoization nodes that were already removed during binding\n                        //       See https://github.com/knockout/knockout/pull/440\n                        //   [B] Any trailing nodes that have been remove should be ignored\n                        //       This prevents the code here from adding unrelated nodes to the array while processing rule [C]\n                        //       See https://github.com/knockout/knockout/pull/1903\n                        //   [C] We want to output a continuous series of nodes. So, ignore any nodes that have already been removed,\n                        //       and include any nodes that have been inserted among the previous collection\n\n                        if (continuousNodeArray.length) {\n                            // The parent node can be a virtual element; so get the real parent node\n                            parentNode = (parentNode.nodeType === 8 && parentNode.parentNode) || parentNode;\n\n                            // Rule [A]\n                            while (continuousNodeArray.length && continuousNodeArray[0].parentNode !== parentNode)\n                                continuousNodeArray.splice(0, 1);\n\n                            // Rule [B]\n                            while (continuousNodeArray.length > 1 && continuousNodeArray[continuousNodeArray.length - 1].parentNode !== parentNode)\n                                continuousNodeArray.length--;\n\n                            // Rule [C]\n                            if (continuousNodeArray.length > 1) {\n                                var current = continuousNodeArray[0], last = continuousNodeArray[continuousNodeArray.length - 1];\n                                // Replace with the actual new continuous node set\n                                continuousNodeArray.length = 0;\n                                while (current !== last) {\n                                    continuousNodeArray.push(current);\n                                    current = current.nextSibling;\n                                }\n                                continuousNodeArray.push(last);\n                            }\n                        }\n                        return continuousNodeArray;\n                    },\n\n                    setOptionNodeSelectionState: function (optionNode, isSelected) {\n                        // IE6 sometimes throws \"unknown error\" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.\n                        if (ieVersion < 7)\n                            optionNode.setAttribute(\"selected\", isSelected);\n                        else\n                            optionNode.selected = isSelected;\n                    },\n\n                    stringTrim: function (string) {\n                        return string === null || string === undefined ? '' :\n                            string.trim ?\n                                string.trim() :\n                                string.toString().replace(/^[\\s\\xa0]+|[\\s\\xa0]+$/g, '');\n                    },\n\n                    stringStartsWith: function (string, startsWith) {\n                        string = string || \"\";\n                        if (startsWith.length > string.length)\n                            return false;\n                        return string.substring(0, startsWith.length) === startsWith;\n                    },\n\n                    domNodeIsContainedBy: function (node, containedByNode) {\n                        if (node === containedByNode)\n                            return true;\n                        if (node.nodeType === 11)\n                            return false; // Fixes issue #1162 - can't use node.contains for document fragments on IE8\n                        if (containedByNode.contains)\n                            return containedByNode.contains(node.nodeType === 3 ? node.parentNode : node);\n                        if (containedByNode.compareDocumentPosition)\n                            return (containedByNode.compareDocumentPosition(node) & 16) == 16;\n                        while (node && node != containedByNode) {\n                            node = node.parentNode;\n                        }\n                        return !!node;\n                    },\n\n                    domNodeIsAttachedToDocument: function (node) {\n                        return ko.utils.domNodeIsContainedBy(node, node.ownerDocument.documentElement);\n                    },\n\n                    anyDomNodeIsAttachedToDocument: function(nodes) {\n                        return !!ko.utils.arrayFirst(nodes, ko.utils.domNodeIsAttachedToDocument);\n                    },\n\n                    tagNameLower: function(element) {\n                        // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.\n                        // Possible future optimization: If we know it's an element from an XHTML document (not HTML),\n                        // we don't need to do the .toLowerCase() as it will always be lower case anyway.\n                        return element && element.tagName && element.tagName.toLowerCase();\n                    },\n\n                    catchFunctionErrors: function (delegate) {\n                        return ko['onError'] ? function () {\n                            try {\n                                return delegate.apply(this, arguments);\n                            } catch (e) {\n                                ko['onError'] && ko['onError'](e);\n                                throw e;\n                            }\n                        } : delegate;\n                    },\n\n                    setTimeout: function (handler, timeout) {\n                        return setTimeout(ko.utils.catchFunctionErrors(handler), timeout);\n                    },\n\n                    deferError: function (error) {\n                        setTimeout(function () {\n                            ko['onError'] && ko['onError'](error);\n                            throw error;\n                        }, 0);\n                    },\n\n                    registerEventHandler: function (element, eventType, handler) {\n                        var wrappedHandler = ko.utils.catchFunctionErrors(handler);\n\n                        var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];\n                        if (!ko.options['useOnlyNativeEvents'] && !mustUseAttachEvent && jQueryInstance) {\n                            jQueryInstance(element)['bind'](eventType, wrappedHandler);\n                        } else if (!mustUseAttachEvent && typeof element.addEventListener == \"function\")\n                            element.addEventListener(eventType, wrappedHandler, false);\n                        else if (typeof element.attachEvent != \"undefined\") {\n                            var attachEventHandler = function (event) { wrappedHandler.call(element, event); },\n                                attachEventName = \"on\" + eventType;\n                            element.attachEvent(attachEventName, attachEventHandler);\n\n                            // IE does not dispose attachEvent handlers automatically (unlike with addEventListener)\n                            // so to avoid leaks, we have to remove them manually. See bug #856\n                            ko.utils.domNodeDisposal.addDisposeCallback(element, function() {\n                                element.detachEvent(attachEventName, attachEventHandler);\n                            });\n                        } else\n                            throw new Error(\"Browser doesn't support addEventListener or attachEvent\");\n                    },\n\n                    triggerEvent: function (element, eventType) {\n                        if (!(element && element.nodeType))\n                            throw new Error(\"element must be a DOM node when calling triggerEvent\");\n\n                        // For click events on checkboxes and radio buttons, jQuery toggles the element checked state *after* the\n                        // event handler runs instead of *before*. (This was fixed in 1.9 for checkboxes but not for radio buttons.)\n                        // IE doesn't change the checked state when you trigger the click event using \"fireEvent\".\n                        // In both cases, we'll use the click method instead.\n                        var useClickWorkaround = isClickOnCheckableElement(element, eventType);\n\n                        if (!ko.options['useOnlyNativeEvents'] && jQueryInstance && !useClickWorkaround) {\n                            jQueryInstance(element)['trigger'](eventType);\n                        } else if (typeof document.createEvent == \"function\") {\n                            if (typeof element.dispatchEvent == \"function\") {\n                                var eventCategory = knownEventTypesByEventName[eventType] || \"HTMLEvents\";\n                                var event = document.createEvent(eventCategory);\n                                event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);\n                                element.dispatchEvent(event);\n                            }\n                            else\n                                throw new Error(\"The supplied element doesn't support dispatchEvent\");\n                        } else if (useClickWorkaround && element.click) {\n                            element.click();\n                        } else if (typeof element.fireEvent != \"undefined\") {\n                            element.fireEvent(\"on\" + eventType);\n                        } else {\n                            throw new Error(\"Browser doesn't support triggering events\");\n                        }\n                    },\n\n                    unwrapObservable: function (value) {\n                        return ko.isObservable(value) ? value() : value;\n                    },\n\n                    peekObservable: function (value) {\n                        return ko.isObservable(value) ? value.peek() : value;\n                    },\n\n                    toggleDomNodeCssClass: toggleDomNodeCssClass,\n\n                    setTextContent: function(element, textContent) {\n                        var value = ko.utils.unwrapObservable(textContent);\n                        if ((value === null) || (value === undefined))\n                            value = \"\";\n\n                        // We need there to be exactly one child: a text node.\n                        // If there are no children, more than one, or if it's not a text node,\n                        // we'll clear everything and create a single text node.\n                        var innerTextNode = ko.virtualElements.firstChild(element);\n                        if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {\n                            ko.virtualElements.setDomNodeChildren(element, [element.ownerDocument.createTextNode(value)]);\n                        } else {\n                            innerTextNode.data = value;\n                        }\n\n                        ko.utils.forceRefresh(element);\n                    },\n\n                    setElementName: function(element, name) {\n                        element.name = name;\n\n                        // Workaround IE 6/7 issue\n                        // - https://github.com/SteveSanderson/knockout/issues/197\n                        // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/\n                        if (ieVersion <= 7) {\n                            try {\n                                element.mergeAttributes(document.createElement(\"<input name='\" + element.name + \"'/>\"), false);\n                            }\n                            catch(e) {} // For IE9 with doc mode \"IE9 Standards\" and browser mode \"IE9 Compatibility View\"\n                        }\n                    },\n\n                    forceRefresh: function(node) {\n                        // Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209\n                        if (ieVersion >= 9) {\n                            // For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container\n                            var elem = node.nodeType == 1 ? node : node.parentNode;\n                            if (elem.style)\n                                elem.style.zoom = elem.style.zoom;\n                        }\n                    },\n\n                    ensureSelectElementIsRenderedCorrectly: function(selectElement) {\n                        // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.\n                        // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)\n                        // Also fixes IE7 and IE8 bug that causes selects to be zero width if enclosed by 'if' or 'with'. (See issue #839)\n                        if (ieVersion) {\n                            var originalWidth = selectElement.style.width;\n                            selectElement.style.width = 0;\n                            selectElement.style.width = originalWidth;\n                        }\n                    },\n\n                    range: function (min, max) {\n                        min = ko.utils.unwrapObservable(min);\n                        max = ko.utils.unwrapObservable(max);\n                        var result = [];\n                        for (var i = min; i <= max; i++)\n                            result.push(i);\n                        return result;\n                    },\n\n                    makeArray: function(arrayLikeObject) {\n                        var result = [];\n                        for (var i = 0, j = arrayLikeObject.length; i < j; i++) {\n                            result.push(arrayLikeObject[i]);\n                        };\n                        return result;\n                    },\n\n                    createSymbolOrString: function(identifier) {\n                        return canUseSymbols ? Symbol(identifier) : identifier;\n                    },\n\n                    isIe6 : isIe6,\n                    isIe7 : isIe7,\n                    ieVersion : ieVersion,\n\n                    getFormFields: function(form, fieldName) {\n                        var fields = ko.utils.makeArray(form.getElementsByTagName(\"input\")).concat(ko.utils.makeArray(form.getElementsByTagName(\"textarea\")));\n                        var isMatchingField = (typeof fieldName == 'string')\n                            ? function(field) { return field.name === fieldName }\n                            : function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate\n                        var matches = [];\n                        for (var i = fields.length - 1; i >= 0; i--) {\n                            if (isMatchingField(fields[i]))\n                                matches.push(fields[i]);\n                        };\n                        return matches;\n                    },\n\n                    parseJson: function (jsonString) {\n                        if (typeof jsonString == \"string\") {\n                            jsonString = ko.utils.stringTrim(jsonString);\n                            if (jsonString) {\n                                if (JSON && JSON.parse) // Use native parsing where available\n                                    return JSON.parse(jsonString);\n                                return (new Function(\"return \" + jsonString))(); // Fallback on less safe parsing for older browsers\n                            }\n                        }\n                        return null;\n                    },\n\n                    stringifyJson: function (data, replacer, space) {   // replacer and space are optional\n                        if (!JSON || !JSON.stringify)\n                            throw new Error(\"Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js\");\n                        return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);\n                    },\n\n                    postJson: function (urlOrForm, data, options) {\n                        options = options || {};\n                        var params = options['params'] || {};\n                        var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;\n                        var url = urlOrForm;\n\n                        // If we were given a form, use its 'action' URL and pick out any requested field values\n                        if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === \"form\")) {\n                            var originalForm = urlOrForm;\n                            url = originalForm.action;\n                            for (var i = includeFields.length - 1; i >= 0; i--) {\n                                var fields = ko.utils.getFormFields(originalForm, includeFields[i]);\n                                for (var j = fields.length - 1; j >= 0; j--)\n                                    params[fields[j].name] = fields[j].value;\n                            }\n                        }\n\n                        data = ko.utils.unwrapObservable(data);\n                        var form = document.createElement(\"form\");\n                        form.style.display = \"none\";\n                        form.action = url;\n                        form.method = \"post\";\n                        for (var key in data) {\n                            // Since 'data' this is a model object, we include all properties including those inherited from its prototype\n                            var input = document.createElement(\"input\");\n                            input.type = \"hidden\";\n                            input.name = key;\n                            input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));\n                            form.appendChild(input);\n                        }\n                        objectForEach(params, function(key, value) {\n                            var input = document.createElement(\"input\");\n                            input.type = \"hidden\";\n                            input.name = key;\n                            input.value = value;\n                            form.appendChild(input);\n                        });\n                        document.body.appendChild(form);\n                        options['submitter'] ? options['submitter'](form) : form.submit();\n                        setTimeout(function () { form.parentNode.removeChild(form); }, 0);\n                    }\n                }\n            }());\n\n            ko.exportSymbol('utils', ko.utils);\n            ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);\n            ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);\n            ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);\n            ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);\n            ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);\n            ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);\n            ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);\n            ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);\n            ko.exportSymbol('utils.extend', ko.utils.extend);\n            ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);\n            ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);\n            ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);\n            ko.exportSymbol('utils.postJson', ko.utils.postJson);\n            ko.exportSymbol('utils.parseJson', ko.utils.parseJson);\n            ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);\n            ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);\n            ko.exportSymbol('utils.range', ko.utils.range);\n            ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);\n            ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);\n            ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);\n            ko.exportSymbol('utils.objectForEach', ko.utils.objectForEach);\n            ko.exportSymbol('utils.addOrRemoveItem', ko.utils.addOrRemoveItem);\n            ko.exportSymbol('utils.setTextContent', ko.utils.setTextContent);\n            ko.exportSymbol('unwrap', ko.utils.unwrapObservable); // Convenient shorthand, because this is used so commonly\n\n            if (!Function.prototype['bind']) {\n                // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)\n                // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js\n                Function.prototype['bind'] = function (object) {\n                    var originalFunction = this;\n                    if (arguments.length === 1) {\n                        return function () {\n                            return originalFunction.apply(object, arguments);\n                        };\n                    } else {\n                        var partialArgs = Array.prototype.slice.call(arguments, 1);\n                        return function () {\n                            var args = partialArgs.slice(0);\n                            args.push.apply(args, arguments);\n                            return originalFunction.apply(object, args);\n                        };\n                    }\n                };\n            }\n\n            ko.utils.domData = new (function () {\n                var uniqueId = 0;\n                var dataStoreKeyExpandoPropertyName = \"__ko__\" + (new Date).getTime();\n                var dataStore = {};\n\n                function getAll(node, createIfNotFound) {\n                    var dataStoreKey = node[dataStoreKeyExpandoPropertyName];\n                    var hasExistingDataStore = dataStoreKey && (dataStoreKey !== \"null\") && dataStore[dataStoreKey];\n                    if (!hasExistingDataStore) {\n                        if (!createIfNotFound)\n                            return undefined;\n                        dataStoreKey = node[dataStoreKeyExpandoPropertyName] = \"ko\" + uniqueId++;\n                        dataStore[dataStoreKey] = {};\n                    }\n                    return dataStore[dataStoreKey];\n                }\n\n                return {\n                    get: function (node, key) {\n                        var allDataForNode = getAll(node, false);\n                        return allDataForNode === undefined ? undefined : allDataForNode[key];\n                    },\n                    set: function (node, key, value) {\n                        if (value === undefined) {\n                            // Make sure we don't actually create a new domData key if we are actually deleting a value\n                            if (getAll(node, false) === undefined)\n                                return;\n                        }\n                        var allDataForNode = getAll(node, true);\n                        allDataForNode[key] = value;\n                    },\n                    clear: function (node) {\n                        var dataStoreKey = node[dataStoreKeyExpandoPropertyName];\n                        if (dataStoreKey) {\n                            delete dataStore[dataStoreKey];\n                            node[dataStoreKeyExpandoPropertyName] = null;\n                            return true; // Exposing \"did clean\" flag purely so specs can infer whether things have been cleaned up as intended\n                        }\n                        return false;\n                    },\n\n                    nextKey: function () {\n                        return (uniqueId++) + dataStoreKeyExpandoPropertyName;\n                    }\n                };\n            })();\n\n            ko.exportSymbol('utils.domData', ko.utils.domData);\n            ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully\n\n            ko.utils.domNodeDisposal = new (function () {\n                var domDataKey = ko.utils.domData.nextKey();\n                var cleanableNodeTypes = { 1: true, 8: true, 9: true };       // Element, Comment, Document\n                var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document\n\n                function getDisposeCallbacksCollection(node, createIfNotFound) {\n                    var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);\n                    if ((allDisposeCallbacks === undefined) && createIfNotFound) {\n                        allDisposeCallbacks = [];\n                        ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);\n                    }\n                    return allDisposeCallbacks;\n                }\n                function destroyCallbacksCollection(node) {\n                    ko.utils.domData.set(node, domDataKey, undefined);\n                }\n\n                function cleanSingleNode(node) {\n                    // Run all the dispose callbacks\n                    var callbacks = getDisposeCallbacksCollection(node, false);\n                    if (callbacks) {\n                        callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)\n                        for (var i = 0; i < callbacks.length; i++)\n                            callbacks[i](node);\n                    }\n\n                    // Erase the DOM data\n                    ko.utils.domData.clear(node);\n\n                    // Perform cleanup needed by external libraries (currently only jQuery, but can be extended)\n                    ko.utils.domNodeDisposal[\"cleanExternalData\"](node);\n\n                    // Clear any immediate-child comment nodes, as these wouldn't have been found by\n                    // node.getElementsByTagName(\"*\") in cleanNode() (comment nodes aren't elements)\n                    if (cleanableNodeTypesWithDescendants[node.nodeType])\n                        cleanImmediateCommentTypeChildren(node);\n                }\n\n                function cleanImmediateCommentTypeChildren(nodeWithChildren) {\n                    var child, nextChild = nodeWithChildren.firstChild;\n                    while (child = nextChild) {\n                        nextChild = child.nextSibling;\n                        if (child.nodeType === 8)\n                            cleanSingleNode(child);\n                    }\n                }\n\n                return {\n                    addDisposeCallback : function(node, callback) {\n                        if (typeof callback != \"function\")\n                            throw new Error(\"Callback must be a function\");\n                        getDisposeCallbacksCollection(node, true).push(callback);\n                    },\n\n                    removeDisposeCallback : function(node, callback) {\n                        var callbacksCollection = getDisposeCallbacksCollection(node, false);\n                        if (callbacksCollection) {\n                            ko.utils.arrayRemoveItem(callbacksCollection, callback);\n                            if (callbacksCollection.length == 0)\n                                destroyCallbacksCollection(node);\n                        }\n                    },\n\n                    cleanNode : function(node) {\n                        // First clean this node, where applicable\n                        if (cleanableNodeTypes[node.nodeType]) {\n                            cleanSingleNode(node);\n\n                            // ... then its descendants, where applicable\n                            if (cleanableNodeTypesWithDescendants[node.nodeType]) {\n                                // Clone the descendants list in case it changes during iteration\n                                var descendants = [];\n                                ko.utils.arrayPushAll(descendants, node.getElementsByTagName(\"*\"));\n                                for (var i = 0, j = descendants.length; i < j; i++)\n                                    cleanSingleNode(descendants[i]);\n                            }\n                        }\n                        return node;\n                    },\n\n                    removeNode : function(node) {\n                        ko.cleanNode(node);\n                        if (node.parentNode)\n                            node.parentNode.removeChild(node);\n                    },\n\n                    \"cleanExternalData\" : function (node) {\n                        // Special support for jQuery here because it's so commonly used.\n                        // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData\n                        // so notify it to tear down any resources associated with the node & descendants here.\n                        if (jQueryInstance && (typeof jQueryInstance['cleanData'] == \"function\"))\n                            jQueryInstance['cleanData']([node]);\n                    }\n                };\n            })();\n            ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience\n            ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience\n            ko.exportSymbol('cleanNode', ko.cleanNode);\n            ko.exportSymbol('removeNode', ko.removeNode);\n            ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);\n            ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);\n            ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);\n            (function () {\n                var none = [0, \"\", \"\"],\n                    table = [1, \"<table>\", \"</table>\"],\n                    tbody = [2, \"<table><tbody>\", \"</tbody></table>\"],\n                    tr = [3, \"<table><tbody><tr>\", \"</tr></tbody></table>\"],\n                    select = [1, \"<select multiple='multiple'>\", \"</select>\"],\n                    lookup = {\n                        'thead': table,\n                        'tbody': table,\n                        'tfoot': table,\n                        'tr': tbody,\n                        'td': tr,\n                        'th': tr,\n                        'option': select,\n                        'optgroup': select\n                    },\n\n                // This is needed for old IE if you're *not* using either jQuery or innerShiv. Doesn't affect other cases.\n                    mayRequireCreateElementHack = ko.utils.ieVersion <= 8;\n\n                function getWrap(tags) {\n                    var m = tags.match(/^<([a-z]+)[ >]/);\n                    return (m && lookup[m[1]]) || none;\n                }\n\n                function simpleHtmlParse(html, documentContext) {\n                    documentContext || (documentContext = document);\n                    var windowContext = documentContext['parentWindow'] || documentContext['defaultView'] || window;\n\n                    // Based on jQuery's \"clean\" function, but only accounting for table-related elements.\n                    // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's \"clean\" function directly\n\n                    // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of\n                    // a descendant node. For example: \"<div><!-- mycomment -->abc</div>\" will get parsed as \"<div>abc</div>\"\n                    // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node\n                    // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.\n\n                    // Trim whitespace, otherwise indexOf won't work as expected\n                    var tags = ko.utils.stringTrim(html).toLowerCase(), div = documentContext.createElement(\"div\"),\n                        wrap = getWrap(tags),\n                        depth = wrap[0];\n\n                    // Go to html and back, then peel off extra wrappers\n                    // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.\n                    var markup = \"ignored<div>\" + wrap[1] + html + wrap[2] + \"</div>\";\n                    if (typeof windowContext['innerShiv'] == \"function\") {\n                        // Note that innerShiv is deprecated in favour of html5shiv. We should consider adding\n                        // support for html5shiv (except if no explicit support is needed, e.g., if html5shiv\n                        // somehow shims the native APIs so it just works anyway)\n                        div.appendChild(windowContext['innerShiv'](markup));\n                    } else {\n                        if (mayRequireCreateElementHack) {\n                            // The document.createElement('my-element') trick to enable custom elements in IE6-8\n                            // only works if we assign innerHTML on an element associated with that document.\n                            documentContext.appendChild(div);\n                        }\n\n                        div.innerHTML = markup;\n\n                        if (mayRequireCreateElementHack) {\n                            div.parentNode.removeChild(div);\n                        }\n                    }\n\n                    // Move to the right depth\n                    while (depth--)\n                        div = div.lastChild;\n\n                    return ko.utils.makeArray(div.lastChild.childNodes);\n                }\n\n                function jQueryHtmlParse(html, documentContext) {\n                    // jQuery's \"parseHTML\" function was introduced in jQuery 1.8.0 and is a documented public API.\n                    if (jQueryInstance['parseHTML']) {\n                        return jQueryInstance['parseHTML'](html, documentContext) || []; // Ensure we always return an array and never null\n                    } else {\n                        // For jQuery < 1.8.0, we fall back on the undocumented internal \"clean\" function.\n                        var elems = jQueryInstance['clean']([html], documentContext);\n\n                        // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.\n                        // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.\n                        // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.\n                        if (elems && elems[0]) {\n                            // Find the top-most parent element that's a direct child of a document fragment\n                            var elem = elems[0];\n                            while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)\n                                elem = elem.parentNode;\n                            // ... then detach it\n                            if (elem.parentNode)\n                                elem.parentNode.removeChild(elem);\n                        }\n\n                        return elems;\n                    }\n                }\n\n                ko.utils.parseHtmlFragment = function(html, documentContext) {\n                    return jQueryInstance ?\n                        jQueryHtmlParse(html, documentContext) :   // As below, benefit from jQuery's optimisations where possible\n                        simpleHtmlParse(html, documentContext);  // ... otherwise, this simple logic will do in most common cases.\n                };\n\n                ko.utils.setHtml = function(node, html) {\n                    ko.utils.emptyDomNode(node);\n\n                    // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it\n                    html = ko.utils.unwrapObservable(html);\n\n                    if ((html !== null) && (html !== undefined)) {\n                        if (typeof html != 'string')\n                            html = html.toString();\n\n                        // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,\n                        // for example <tr> elements which are not normally allowed to exist on their own.\n                        // If you've referenced jQuery we'll use that rather than duplicating its code.\n                        if (jQueryInstance) {\n                            jQueryInstance(node)['html'](html);\n                        } else {\n                            // ... otherwise, use KO's own parsing logic.\n                            var parsedNodes = ko.utils.parseHtmlFragment(html, node.ownerDocument);\n                            for (var i = 0; i < parsedNodes.length; i++)\n                                node.appendChild(parsedNodes[i]);\n                        }\n                    }\n                };\n            })();\n\n            ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);\n            ko.exportSymbol('utils.setHtml', ko.utils.setHtml);\n\n            ko.memoization = (function () {\n                var memos = {};\n\n                function randomMax8HexChars() {\n                    return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);\n                }\n                function generateRandomId() {\n                    return randomMax8HexChars() + randomMax8HexChars();\n                }\n                function findMemoNodes(rootNode, appendToArray) {\n                    if (!rootNode)\n                        return;\n                    if (rootNode.nodeType == 8) {\n                        var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);\n                        if (memoId != null)\n                            appendToArray.push({ domNode: rootNode, memoId: memoId });\n                    } else if (rootNode.nodeType == 1) {\n                        for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)\n                            findMemoNodes(childNodes[i], appendToArray);\n                    }\n                }\n\n                return {\n                    memoize: function (callback) {\n                        if (typeof callback != \"function\")\n                            throw new Error(\"You can only pass a function to ko.memoization.memoize()\");\n                        var memoId = generateRandomId();\n                        memos[memoId] = callback;\n                        return \"<!--[ko_memo:\" + memoId + \"]-->\";\n                    },\n\n                    unmemoize: function (memoId, callbackParams) {\n                        var callback = memos[memoId];\n                        if (callback === undefined)\n                            throw new Error(\"Couldn't find any memo with ID \" + memoId + \". Perhaps it's already been unmemoized.\");\n                        try {\n                            callback.apply(null, callbackParams || []);\n                            return true;\n                        }\n                        finally { delete memos[memoId]; }\n                    },\n\n                    unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {\n                        var memos = [];\n                        findMemoNodes(domNode, memos);\n                        for (var i = 0, j = memos.length; i < j; i++) {\n                            var node = memos[i].domNode;\n                            var combinedParams = [node];\n                            if (extraCallbackParamsArray)\n                                ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);\n                            ko.memoization.unmemoize(memos[i].memoId, combinedParams);\n                            node.nodeValue = \"\"; // Neuter this node so we don't try to unmemoize it again\n                            if (node.parentNode)\n                                node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)\n                        }\n                    },\n\n                    parseMemoText: function (memoText) {\n                        var match = memoText.match(/^\\[ko_memo\\:(.*?)\\]$/);\n                        return match ? match[1] : null;\n                    }\n                };\n            })();\n\n            ko.exportSymbol('memoization', ko.memoization);\n            ko.exportSymbol('memoization.memoize', ko.memoization.memoize);\n            ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);\n            ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);\n            ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);\n            ko.tasks = (function () {\n                var scheduler,\n                    taskQueue = [],\n                    taskQueueLength = 0,\n                    nextHandle = 1,\n                    nextIndexToProcess = 0;\n\n                if (window['MutationObserver']) {\n                    // Chrome 27+, Firefox 14+, IE 11+, Opera 15+, Safari 6.1+\n                    // From https://github.com/petkaantonov/bluebird * Copyright (c) 2014 Petka Antonov * License: MIT\n                    scheduler = (function (callback) {\n                        var div = document.createElement(\"div\");\n                        new MutationObserver(callback).observe(div, {attributes: true});\n                        return function () { div.classList.toggle(\"foo\"); };\n                    })(scheduledProcess);\n                } else if (document && \"onreadystatechange\" in document.createElement(\"script\")) {\n                    // IE 6-10\n                    // From https://github.com/YuzuJS/setImmediate * Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic Denicola * License: MIT\n                    scheduler = function (callback) {\n                        var script = document.createElement(\"script\");\n                        script.onreadystatechange = function () {\n                            script.onreadystatechange = null;\n                            document.documentElement.removeChild(script);\n                            script = null;\n                            callback();\n                        };\n                        document.documentElement.appendChild(script);\n                    };\n                } else {\n                    scheduler = function (callback) {\n                        setTimeout(callback, 0);\n                    };\n                }\n\n                function processTasks() {\n                    if (taskQueueLength) {\n                        // Each mark represents the end of a logical group of tasks and the number of these groups is\n                        // limited to prevent unchecked recursion.\n                        var mark = taskQueueLength, countMarks = 0;\n\n                        // nextIndexToProcess keeps track of where we are in the queue; processTasks can be called recursively without issue\n                        for (var task; nextIndexToProcess < taskQueueLength; ) {\n                            if (task = taskQueue[nextIndexToProcess++]) {\n                                if (nextIndexToProcess > mark) {\n                                    if (++countMarks >= 5000) {\n                                        nextIndexToProcess = taskQueueLength;   // skip all tasks remaining in the queue since any of them could be causing the recursion\n                                        ko.utils.deferError(Error(\"'Too much recursion' after processing \" + countMarks + \" task groups.\"));\n                                        break;\n                                    }\n                                    mark = taskQueueLength;\n                                }\n                                try {\n                                    task();\n                                } catch (ex) {\n                                    ko.utils.deferError(ex);\n                                }\n                            }\n                        }\n                    }\n                }\n\n                function scheduledProcess() {\n                    processTasks();\n\n                    // Reset the queue\n                    nextIndexToProcess = taskQueueLength = taskQueue.length = 0;\n                }\n\n                function scheduleTaskProcessing() {\n                    ko.tasks['scheduler'](scheduledProcess);\n                }\n\n                var tasks = {\n                    'scheduler': scheduler,     // Allow overriding the scheduler\n\n                    schedule: function (func) {\n                        if (!taskQueueLength) {\n                            scheduleTaskProcessing();\n                        }\n\n                        taskQueue[taskQueueLength++] = func;\n                        return nextHandle++;\n                    },\n\n                    cancel: function (handle) {\n                        var index = handle - (nextHandle - taskQueueLength);\n                        if (index >= nextIndexToProcess && index < taskQueueLength) {\n                            taskQueue[index] = null;\n                        }\n                    },\n\n                    // For testing only: reset the queue and return the previous queue length\n                    'resetForTesting': function () {\n                        var length = taskQueueLength - nextIndexToProcess;\n                        nextIndexToProcess = taskQueueLength = taskQueue.length = 0;\n                        return length;\n                    },\n\n                    runEarly: processTasks\n                };\n\n                return tasks;\n            })();\n\n            ko.exportSymbol('tasks', ko.tasks);\n            ko.exportSymbol('tasks.schedule', ko.tasks.schedule);\n//ko.exportSymbol('tasks.cancel', ko.tasks.cancel);  \"cancel\" isn't minified\n            ko.exportSymbol('tasks.runEarly', ko.tasks.runEarly);\n            ko.extenders = {\n                'throttle': function(target, timeout) {\n                    // Throttling means two things:\n\n                    // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies\n                    //     notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate\n                    target['throttleEvaluation'] = timeout;\n\n                    // (2) For writable targets (observables, or writable dependent observables), we throttle *writes*\n                    //     so the target cannot change value synchronously or faster than a certain rate\n                    var writeTimeoutInstance = null;\n                    return ko.dependentObservable({\n                        'read': target,\n                        'write': function(value) {\n                            clearTimeout(writeTimeoutInstance);\n                            writeTimeoutInstance = ko.utils.setTimeout(function() {\n                                target(value);\n                            }, timeout);\n                        }\n                    });\n                },\n\n                'rateLimit': function(target, options) {\n                    var timeout, method, limitFunction;\n\n                    if (typeof options == 'number') {\n                        timeout = options;\n                    } else {\n                        timeout = options['timeout'];\n                        method = options['method'];\n                    }\n\n                    // rateLimit supersedes deferred updates\n                    target._deferUpdates = false;\n\n                    limitFunction = method == 'notifyWhenChangesStop' ?  debounce : throttle;\n                    target.limit(function(callback) {\n                        return limitFunction(callback, timeout);\n                    });\n                },\n\n                'deferred': function(target, options) {\n                    if (options !== true) {\n                        throw new Error('The \\'deferred\\' extender only accepts the value \\'true\\', because it is not supported to turn deferral off once enabled.')\n                    }\n\n                    if (!target._deferUpdates) {\n                        target._deferUpdates = true;\n                        target.limit(function (callback) {\n                            var handle;\n                            return function () {\n                                ko.tasks.cancel(handle);\n                                handle = ko.tasks.schedule(callback);\n                                target['notifySubscribers'](undefined, 'dirty');\n                            };\n                        });\n                    }\n                },\n\n                'notify': function(target, notifyWhen) {\n                    target[\"equalityComparer\"] = notifyWhen == \"always\" ?\n                        null :  // null equalityComparer means to always notify\n                        valuesArePrimitiveAndEqual;\n                }\n            };\n\n            var primitiveTypes = { 'undefined':1, 'boolean':1, 'number':1, 'string':1 };\n            function valuesArePrimitiveAndEqual(a, b) {\n                var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);\n                return oldValueIsPrimitive ? (a === b) : false;\n            }\n\n            function throttle(callback, timeout) {\n                var timeoutInstance;\n                return function () {\n                    if (!timeoutInstance) {\n                        timeoutInstance = ko.utils.setTimeout(function () {\n                            timeoutInstance = undefined;\n                            callback();\n                        }, timeout);\n                    }\n                };\n            }\n\n            function debounce(callback, timeout) {\n                var timeoutInstance;\n                return function () {\n                    clearTimeout(timeoutInstance);\n                    timeoutInstance = ko.utils.setTimeout(callback, timeout);\n                };\n            }\n\n            function applyExtenders(requestedExtenders) {\n                var target = this;\n                if (requestedExtenders) {\n                    ko.utils.objectForEach(requestedExtenders, function(key, value) {\n                        var extenderHandler = ko.extenders[key];\n                        if (typeof extenderHandler == 'function') {\n                            target = extenderHandler(target, value) || target;\n                        }\n                    });\n                }\n                return target;\n            }\n\n            ko.exportSymbol('extenders', ko.extenders);\n\n            ko.subscription = function (target, callback, disposeCallback) {\n                this._target = target;\n                this.callback = callback;\n                this.disposeCallback = disposeCallback;\n                this.isDisposed = false;\n                ko.exportProperty(this, 'dispose', this.dispose);\n            };\n            ko.subscription.prototype.dispose = function () {\n                this.isDisposed = true;\n                this.disposeCallback();\n            };\n\n            ko.subscribable = function () {\n                ko.utils.setPrototypeOfOrExtend(this, ko_subscribable_fn);\n                ko_subscribable_fn.init(this);\n            }\n\n            var defaultEvent = \"change\";\n\n// Moved out of \"limit\" to avoid the extra closure\n            function limitNotifySubscribers(value, event) {\n                if (!event || event === defaultEvent) {\n                    this._limitChange(value);\n                } else if (event === 'beforeChange') {\n                    this._limitBeforeChange(value);\n                } else {\n                    this._origNotifySubscribers(value, event);\n                }\n            }\n\n            var ko_subscribable_fn = {\n                init: function(instance) {\n                    instance._subscriptions = {};\n                    instance._versionNumber = 1;\n                },\n\n                subscribe: function (callback, callbackTarget, event) {\n                    var self = this;\n\n                    event = event || defaultEvent;\n                    var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;\n\n                    var subscription = new ko.subscription(self, boundCallback, function () {\n                        ko.utils.arrayRemoveItem(self._subscriptions[event], subscription);\n                        if (self.afterSubscriptionRemove)\n                            self.afterSubscriptionRemove(event);\n                    });\n\n                    if (self.beforeSubscriptionAdd)\n                        self.beforeSubscriptionAdd(event);\n\n                    if (!self._subscriptions[event])\n                        self._subscriptions[event] = [];\n                    self._subscriptions[event].push(subscription);\n\n                    return subscription;\n                },\n\n                \"notifySubscribers\": function (valueToNotify, event) {\n                    event = event || defaultEvent;\n                    if (event === defaultEvent) {\n                        this.updateVersion();\n                    }\n                    if (this.hasSubscriptionsForEvent(event)) {\n                        try {\n                            ko.dependencyDetection.begin(); // Begin suppressing dependency detection (by setting the top frame to undefined)\n                            for (var a = this._subscriptions[event].slice(0), i = 0, subscription; subscription = a[i]; ++i) {\n                                // In case a subscription was disposed during the arrayForEach cycle, check\n                                // for isDisposed on each subscription before invoking its callback\n                                if (!subscription.isDisposed)\n                                    subscription.callback(valueToNotify);\n                            }\n                        } finally {\n                            ko.dependencyDetection.end(); // End suppressing dependency detection\n                        }\n                    }\n                },\n\n                getVersion: function () {\n                    return this._versionNumber;\n                },\n\n                hasChanged: function (versionToCheck) {\n                    return this.getVersion() !== versionToCheck;\n                },\n\n                updateVersion: function () {\n                    ++this._versionNumber;\n                },\n\n                limit: function(limitFunction) {\n                    var self = this, selfIsObservable = ko.isObservable(self),\n                        ignoreBeforeChange, previousValue, pendingValue, beforeChange = 'beforeChange';\n\n                    if (!self._origNotifySubscribers) {\n                        self._origNotifySubscribers = self[\"notifySubscribers\"];\n                        self[\"notifySubscribers\"] = limitNotifySubscribers;\n                    }\n\n                    var finish = limitFunction(function() {\n                        self._notificationIsPending = false;\n\n                        // If an observable provided a reference to itself, access it to get the latest value.\n                        // This allows computed observables to delay calculating their value until needed.\n                        if (selfIsObservable && pendingValue === self) {\n                            pendingValue = self();\n                        }\n                        ignoreBeforeChange = false;\n                        if (self.isDifferent(previousValue, pendingValue)) {\n                            self._origNotifySubscribers(previousValue = pendingValue);\n                        }\n                    });\n\n                    self._limitChange = function(value) {\n                        self._notificationIsPending = ignoreBeforeChange = true;\n                        pendingValue = value;\n                        finish();\n                    };\n                    self._limitBeforeChange = function(value) {\n                        if (!ignoreBeforeChange) {\n                            previousValue = value;\n                            self._origNotifySubscribers(value, beforeChange);\n                        }\n                    };\n                },\n\n                hasSubscriptionsForEvent: function(event) {\n                    return this._subscriptions[event] && this._subscriptions[event].length;\n                },\n\n                getSubscriptionsCount: function (event) {\n                    if (event) {\n                        return this._subscriptions[event] && this._subscriptions[event].length || 0;\n                    } else {\n                        var total = 0;\n                        ko.utils.objectForEach(this._subscriptions, function(eventName, subscriptions) {\n                            if (eventName !== 'dirty')\n                                total += subscriptions.length;\n                        });\n                        return total;\n                    }\n                },\n\n                isDifferent: function(oldValue, newValue) {\n                    return !this['equalityComparer'] || !this['equalityComparer'](oldValue, newValue);\n                },\n\n                extend: applyExtenders\n            };\n\n            ko.exportProperty(ko_subscribable_fn, 'subscribe', ko_subscribable_fn.subscribe);\n            ko.exportProperty(ko_subscribable_fn, 'extend', ko_subscribable_fn.extend);\n            ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_fn.getSubscriptionsCount);\n\n// For browsers that support proto assignment, we overwrite the prototype of each\n// observable instance. Since observables are functions, we need Function.prototype\n// to still be in the prototype chain.\n            if (ko.utils.canSetPrototype) {\n                ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype);\n            }\n\n            ko.subscribable['fn'] = ko_subscribable_fn;\n\n\n            ko.isSubscribable = function (instance) {\n                return instance != null && typeof instance.subscribe == \"function\" && typeof instance[\"notifySubscribers\"] == \"function\";\n            };\n\n            ko.exportSymbol('subscribable', ko.subscribable);\n            ko.exportSymbol('isSubscribable', ko.isSubscribable);\n\n            ko.computedContext = ko.dependencyDetection = (function () {\n                var outerFrames = [],\n                    currentFrame,\n                    lastId = 0;\n\n                // Return a unique ID that can be assigned to an observable for dependency tracking.\n                // Theoretically, you could eventually overflow the number storage size, resulting\n                // in duplicate IDs. But in JavaScript, the largest exact integral value is 2^53\n                // or 9,007,199,254,740,992. If you created 1,000,000 IDs per second, it would\n                // take over 285 years to reach that number.\n                // Reference http://blog.vjeux.com/2010/javascript/javascript-max_int-number-limits.html\n                function getId() {\n                    return ++lastId;\n                }\n\n                function begin(options) {\n                    outerFrames.push(currentFrame);\n                    currentFrame = options;\n                }\n\n                function end() {\n                    currentFrame = outerFrames.pop();\n                }\n\n                return {\n                    begin: begin,\n\n                    end: end,\n\n                    registerDependency: function (subscribable) {\n                        if (currentFrame) {\n                            if (!ko.isSubscribable(subscribable))\n                                throw new Error(\"Only subscribable things can act as dependencies\");\n                            currentFrame.callback.call(currentFrame.callbackTarget, subscribable, subscribable._id || (subscribable._id = getId()));\n                        }\n                    },\n\n                    ignore: function (callback, callbackTarget, callbackArgs) {\n                        try {\n                            begin();\n                            return callback.apply(callbackTarget, callbackArgs || []);\n                        } finally {\n                            end();\n                        }\n                    },\n\n                    getDependenciesCount: function () {\n                        if (currentFrame)\n                            return currentFrame.computed.getDependenciesCount();\n                    },\n\n                    isInitial: function() {\n                        if (currentFrame)\n                            return currentFrame.isInitial;\n                    }\n                };\n            })();\n\n            ko.exportSymbol('computedContext', ko.computedContext);\n            ko.exportSymbol('computedContext.getDependenciesCount', ko.computedContext.getDependenciesCount);\n            ko.exportSymbol('computedContext.isInitial', ko.computedContext.isInitial);\n\n            ko.exportSymbol('ignoreDependencies', ko.ignoreDependencies = ko.dependencyDetection.ignore);\n            var observableLatestValue = ko.utils.createSymbolOrString('_latestValue');\n\n            ko.observable = function (initialValue) {\n                function observable() {\n                    if (arguments.length > 0) {\n                        // Write\n\n                        // Ignore writes if the value hasn't changed\n                        if (observable.isDifferent(observable[observableLatestValue], arguments[0])) {\n                            observable.valueWillMutate();\n                            observable[observableLatestValue] = arguments[0];\n                            observable.valueHasMutated();\n                        }\n                        return this; // Permits chained assignments\n                    }\n                    else {\n                        // Read\n                        ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a \"read\" operation\n                        return observable[observableLatestValue];\n                    }\n                }\n\n                observable[observableLatestValue] = initialValue;\n\n                // Inherit from 'subscribable'\n                if (!ko.utils.canSetPrototype) {\n                    // 'subscribable' won't be on the prototype chain unless we put it there directly\n                    ko.utils.extend(observable, ko.subscribable['fn']);\n                }\n                ko.subscribable['fn'].init(observable);\n\n                // Inherit from 'observable'\n                ko.utils.setPrototypeOfOrExtend(observable, observableFn);\n\n                if (ko.options['deferUpdates']) {\n                    ko.extenders['deferred'](observable, true);\n                }\n\n                return observable;\n            }\n\n// Define prototype for observables\n            var observableFn = {\n                'equalityComparer': valuesArePrimitiveAndEqual,\n                peek: function() { return this[observableLatestValue]; },\n                valueHasMutated: function () { this['notifySubscribers'](this[observableLatestValue]); },\n                valueWillMutate: function () { this['notifySubscribers'](this[observableLatestValue], 'beforeChange'); }\n            };\n\n// Note that for browsers that don't support proto assignment, the\n// inheritance chain is created manually in the ko.observable constructor\n            if (ko.utils.canSetPrototype) {\n                ko.utils.setPrototypeOf(observableFn, ko.subscribable['fn']);\n            }\n\n            var protoProperty = ko.observable.protoProperty = '__ko_proto__';\n            observableFn[protoProperty] = ko.observable;\n\n            ko.hasPrototype = function(instance, prototype) {\n                if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;\n                if (instance[protoProperty] === prototype) return true;\n                return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain\n            };\n\n            ko.isObservable = function (instance) {\n                return ko.hasPrototype(instance, ko.observable);\n            }\n            ko.isWriteableObservable = function (instance) {\n                // Observable\n                if ((typeof instance == 'function') && instance[protoProperty] === ko.observable)\n                    return true;\n                // Writeable dependent observable\n                if ((typeof instance == 'function') && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))\n                    return true;\n                // Anything else\n                return false;\n            }\n\n            ko.exportSymbol('observable', ko.observable);\n            ko.exportSymbol('isObservable', ko.isObservable);\n            ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);\n            ko.exportSymbol('isWritableObservable', ko.isWriteableObservable);\n            ko.exportSymbol('observable.fn', observableFn);\n            ko.exportProperty(observableFn, 'peek', observableFn.peek);\n            ko.exportProperty(observableFn, 'valueHasMutated', observableFn.valueHasMutated);\n            ko.exportProperty(observableFn, 'valueWillMutate', observableFn.valueWillMutate);\n            ko.observableArray = function (initialValues) {\n                initialValues = initialValues || [];\n\n                if (typeof initialValues != 'object' || !('length' in initialValues))\n                    throw new Error(\"The argument passed when initializing an observable array must be an array, or null, or undefined.\");\n\n                var result = ko.observable(initialValues);\n                ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']);\n                return result.extend({'trackArrayChanges':true});\n            };\n\n            ko.observableArray['fn'] = {\n                'remove': function (valueOrPredicate) {\n                    var underlyingArray = this.peek();\n                    var removedValues = [];\n                    var predicate = typeof valueOrPredicate == \"function\" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };\n                    for (var i = 0; i < underlyingArray.length; i++) {\n                        var value = underlyingArray[i];\n                        if (predicate(value)) {\n                            if (removedValues.length === 0) {\n                                this.valueWillMutate();\n                            }\n                            removedValues.push(value);\n                            underlyingArray.splice(i, 1);\n                            i--;\n                        }\n                    }\n                    if (removedValues.length) {\n                        this.valueHasMutated();\n                    }\n                    return removedValues;\n                },\n\n                'removeAll': function (arrayOfValues) {\n                    // If you passed zero args, we remove everything\n                    if (arrayOfValues === undefined) {\n                        var underlyingArray = this.peek();\n                        var allValues = underlyingArray.slice(0);\n                        this.valueWillMutate();\n                        underlyingArray.splice(0, underlyingArray.length);\n                        this.valueHasMutated();\n                        return allValues;\n                    }\n                    // If you passed an arg, we interpret it as an array of entries to remove\n                    if (!arrayOfValues)\n                        return [];\n                    return this['remove'](function (value) {\n                        return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;\n                    });\n                },\n\n                'destroy': function (valueOrPredicate) {\n                    var underlyingArray = this.peek();\n                    var predicate = typeof valueOrPredicate == \"function\" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };\n                    this.valueWillMutate();\n                    for (var i = underlyingArray.length - 1; i >= 0; i--) {\n                        var value = underlyingArray[i];\n                        if (predicate(value))\n                            underlyingArray[i][\"_destroy\"] = true;\n                    }\n                    this.valueHasMutated();\n                },\n\n                'destroyAll': function (arrayOfValues) {\n                    // If you passed zero args, we destroy everything\n                    if (arrayOfValues === undefined)\n                        return this['destroy'](function() { return true });\n\n                    // If you passed an arg, we interpret it as an array of entries to destroy\n                    if (!arrayOfValues)\n                        return [];\n                    return this['destroy'](function (value) {\n                        return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;\n                    });\n                },\n\n                'indexOf': function (item) {\n                    var underlyingArray = this();\n                    return ko.utils.arrayIndexOf(underlyingArray, item);\n                },\n\n                'replace': function(oldItem, newItem) {\n                    var index = this['indexOf'](oldItem);\n                    if (index >= 0) {\n                        this.valueWillMutate();\n                        this.peek()[index] = newItem;\n                        this.valueHasMutated();\n                    }\n                }\n            };\n\n// Note that for browsers that don't support proto assignment, the\n// inheritance chain is created manually in the ko.observableArray constructor\n            if (ko.utils.canSetPrototype) {\n                ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);\n            }\n\n// Populate ko.observableArray.fn with read/write functions from native arrays\n// Important: Do not add any additional functions here that may reasonably be used to *read* data from the array\n// because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale\n            ko.utils.arrayForEach([\"pop\", \"push\", \"reverse\", \"shift\", \"sort\", \"splice\", \"unshift\"], function (methodName) {\n                ko.observableArray['fn'][methodName] = function () {\n                    // Use \"peek\" to avoid creating a subscription in any computed that we're executing in the context of\n                    // (for consistency with mutating regular observables)\n                    var underlyingArray = this.peek();\n                    this.valueWillMutate();\n                    this.cacheDiffForKnownOperation(underlyingArray, methodName, arguments);\n                    var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);\n                    this.valueHasMutated();\n                    // The native sort and reverse methods return a reference to the array, but it makes more sense to return the observable array instead.\n                    return methodCallResult === underlyingArray ? this : methodCallResult;\n                };\n            });\n\n// Populate ko.observableArray.fn with read-only functions from native arrays\n            ko.utils.arrayForEach([\"slice\"], function (methodName) {\n                ko.observableArray['fn'][methodName] = function () {\n                    var underlyingArray = this();\n                    return underlyingArray[methodName].apply(underlyingArray, arguments);\n                };\n            });\n\n            ko.exportSymbol('observableArray', ko.observableArray);\n            var arrayChangeEventName = 'arrayChange';\n            ko.extenders['trackArrayChanges'] = function(target, options) {\n                // Use the provided options--each call to trackArrayChanges overwrites the previously set options\n                target.compareArrayOptions = {};\n                if (options && typeof options == \"object\") {\n                    ko.utils.extend(target.compareArrayOptions, options);\n                }\n                target.compareArrayOptions['sparse'] = true;\n\n                // Only modify the target observable once\n                if (target.cacheDiffForKnownOperation) {\n                    return;\n                }\n                var trackingChanges = false,\n                    cachedDiff = null,\n                    arrayChangeSubscription,\n                    pendingNotifications = 0,\n                    underlyingBeforeSubscriptionAddFunction = target.beforeSubscriptionAdd,\n                    underlyingAfterSubscriptionRemoveFunction = target.afterSubscriptionRemove;\n\n                // Watch \"subscribe\" calls, and for array change events, ensure change tracking is enabled\n                target.beforeSubscriptionAdd = function (event) {\n                    if (underlyingBeforeSubscriptionAddFunction)\n                        underlyingBeforeSubscriptionAddFunction.call(target, event);\n                    if (event === arrayChangeEventName) {\n                        trackChanges();\n                    }\n                };\n                // Watch \"dispose\" calls, and for array change events, ensure change tracking is disabled when all are disposed\n                target.afterSubscriptionRemove = function (event) {\n                    if (underlyingAfterSubscriptionRemoveFunction)\n                        underlyingAfterSubscriptionRemoveFunction.call(target, event);\n                    if (event === arrayChangeEventName && !target.hasSubscriptionsForEvent(arrayChangeEventName)) {\n                        arrayChangeSubscription.dispose();\n                        trackingChanges = false;\n                    }\n                };\n\n                function trackChanges() {\n                    // Calling 'trackChanges' multiple times is the same as calling it once\n                    if (trackingChanges) {\n                        return;\n                    }\n\n                    trackingChanges = true;\n\n                    // Intercept \"notifySubscribers\" to track how many times it was called.\n                    var underlyingNotifySubscribersFunction = target['notifySubscribers'];\n                    target['notifySubscribers'] = function(valueToNotify, event) {\n                        if (!event || event === defaultEvent) {\n                            ++pendingNotifications;\n                        }\n                        return underlyingNotifySubscribersFunction.apply(this, arguments);\n                    };\n\n                    // Each time the array changes value, capture a clone so that on the next\n                    // change it's possible to produce a diff\n                    var previousContents = [].concat(target.peek() || []);\n                    cachedDiff = null;\n                    arrayChangeSubscription = target.subscribe(function(currentContents) {\n                        // Make a copy of the current contents and ensure it's an array\n                        currentContents = [].concat(currentContents || []);\n\n                        // Compute the diff and issue notifications, but only if someone is listening\n                        if (target.hasSubscriptionsForEvent(arrayChangeEventName)) {\n                            var changes = getChanges(previousContents, currentContents);\n                        }\n\n                        // Eliminate references to the old, removed items, so they can be GCed\n                        previousContents = currentContents;\n                        cachedDiff = null;\n                        pendingNotifications = 0;\n\n                        if (changes && changes.length) {\n                            target['notifySubscribers'](changes, arrayChangeEventName);\n                        }\n                    });\n                }\n\n                function getChanges(previousContents, currentContents) {\n                    // We try to re-use cached diffs.\n                    // The scenarios where pendingNotifications > 1 are when using rate-limiting or the Deferred Updates\n                    // plugin, which without this check would not be compatible with arrayChange notifications. Normally,\n                    // notifications are issued immediately so we wouldn't be queueing up more than one.\n                    if (!cachedDiff || pendingNotifications > 1) {\n                        cachedDiff = ko.utils.compareArrays(previousContents, currentContents, target.compareArrayOptions);\n                    }\n\n                    return cachedDiff;\n                }\n\n                target.cacheDiffForKnownOperation = function(rawArray, operationName, args) {\n                    // Only run if we're currently tracking changes for this observable array\n                    // and there aren't any pending deferred notifications.\n                    if (!trackingChanges || pendingNotifications) {\n                        return;\n                    }\n                    var diff = [],\n                        arrayLength = rawArray.length,\n                        argsLength = args.length,\n                        offset = 0;\n\n                    function pushDiff(status, value, index) {\n                        return diff[diff.length] = { 'status': status, 'value': value, 'index': index };\n                    }\n                    switch (operationName) {\n                        case 'push':\n                            offset = arrayLength;\n                        case 'unshift':\n                            for (var index = 0; index < argsLength; index++) {\n                                pushDiff('added', args[index], offset + index);\n                            }\n                            break;\n\n                        case 'pop':\n                            offset = arrayLength - 1;\n                        case 'shift':\n                            if (arrayLength) {\n                                pushDiff('deleted', rawArray[offset], offset);\n                            }\n                            break;\n\n                        case 'splice':\n                            // Negative start index means 'from end of array'. After that we clamp to [0...arrayLength].\n                            // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice\n                            var startIndex = Math.min(Math.max(0, args[0] < 0 ? arrayLength + args[0] : args[0]), arrayLength),\n                                endDeleteIndex = argsLength === 1 ? arrayLength : Math.min(startIndex + (args[1] || 0), arrayLength),\n                                endAddIndex = startIndex + argsLength - 2,\n                                endIndex = Math.max(endDeleteIndex, endAddIndex),\n                                additions = [], deletions = [];\n                            for (var index = startIndex, argsIndex = 2; index < endIndex; ++index, ++argsIndex) {\n                                if (index < endDeleteIndex)\n                                    deletions.push(pushDiff('deleted', rawArray[index], index));\n                                if (index < endAddIndex)\n                                    additions.push(pushDiff('added', args[argsIndex], index));\n                            }\n                            ko.utils.findMovesInArrayComparison(deletions, additions);\n                            break;\n\n                        default:\n                            return;\n                    }\n                    cachedDiff = diff;\n                };\n            };\n            var computedState = ko.utils.createSymbolOrString('_state');\n\n            ko.computed = ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {\n                if (typeof evaluatorFunctionOrOptions === \"object\") {\n                    // Single-parameter syntax - everything is on this \"options\" param\n                    options = evaluatorFunctionOrOptions;\n                } else {\n                    // Multi-parameter syntax - construct the options according to the params passed\n                    options = options || {};\n                    if (evaluatorFunctionOrOptions) {\n                        options[\"read\"] = evaluatorFunctionOrOptions;\n                    }\n                }\n                if (typeof options[\"read\"] != \"function\")\n                    throw Error(\"Pass a function that returns the value of the ko.computed\");\n\n                var writeFunction = options[\"write\"];\n                var state = {\n                    latestValue: undefined,\n                    isStale: true,\n                    isBeingEvaluated: false,\n                    suppressDisposalUntilDisposeWhenReturnsFalse: false,\n                    isDisposed: false,\n                    pure: false,\n                    isSleeping: false,\n                    readFunction: options[\"read\"],\n                    evaluatorFunctionTarget: evaluatorFunctionTarget || options[\"owner\"],\n                    disposeWhenNodeIsRemoved: options[\"disposeWhenNodeIsRemoved\"] || options.disposeWhenNodeIsRemoved || null,\n                    disposeWhen: options[\"disposeWhen\"] || options.disposeWhen,\n                    domNodeDisposalCallback: null,\n                    dependencyTracking: {},\n                    dependenciesCount: 0,\n                    evaluationTimeoutInstance: null\n                };\n\n                function computedObservable() {\n                    if (arguments.length > 0) {\n                        if (typeof writeFunction === \"function\") {\n                            // Writing a value\n                            writeFunction.apply(state.evaluatorFunctionTarget, arguments);\n                        } else {\n                            throw new Error(\"Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.\");\n                        }\n                        return this; // Permits chained assignments\n                    } else {\n                        // Reading the value\n                        ko.dependencyDetection.registerDependency(computedObservable);\n                        if (state.isStale || (state.isSleeping && computedObservable.haveDependenciesChanged())) {\n                            computedObservable.evaluateImmediate();\n                        }\n                        return state.latestValue;\n                    }\n                }\n\n                computedObservable[computedState] = state;\n                computedObservable.hasWriteFunction = typeof writeFunction === \"function\";\n\n                // Inherit from 'subscribable'\n                if (!ko.utils.canSetPrototype) {\n                    // 'subscribable' won't be on the prototype chain unless we put it there directly\n                    ko.utils.extend(computedObservable, ko.subscribable['fn']);\n                }\n                ko.subscribable['fn'].init(computedObservable);\n\n                // Inherit from 'computed'\n                ko.utils.setPrototypeOfOrExtend(computedObservable, computedFn);\n\n                if (options['pure']) {\n                    state.pure = true;\n                    state.isSleeping = true;     // Starts off sleeping; will awake on the first subscription\n                    ko.utils.extend(computedObservable, pureComputedOverrides);\n                } else if (options['deferEvaluation']) {\n                    ko.utils.extend(computedObservable, deferEvaluationOverrides);\n                }\n\n                if (ko.options['deferUpdates']) {\n                    ko.extenders['deferred'](computedObservable, true);\n                }\n\n                if (DEBUG) {\n                    // #1731 - Aid debugging by exposing the computed's options\n                    computedObservable[\"_options\"] = options;\n                }\n\n                if (state.disposeWhenNodeIsRemoved) {\n                    // Since this computed is associated with a DOM node, and we don't want to dispose the computed\n                    // until the DOM node is *removed* from the document (as opposed to never having been in the document),\n                    // we'll prevent disposal until \"disposeWhen\" first returns false.\n                    state.suppressDisposalUntilDisposeWhenReturnsFalse = true;\n\n                    // disposeWhenNodeIsRemoved: true can be used to opt into the \"only dispose after first false result\"\n                    // behaviour even if there's no specific node to watch. In that case, clear the option so we don't try\n                    // to watch for a non-node's disposal. This technique is intended for KO's internal use only and shouldn't\n                    // be documented or used by application code, as it's likely to change in a future version of KO.\n                    if (!state.disposeWhenNodeIsRemoved.nodeType) {\n                        state.disposeWhenNodeIsRemoved = null;\n                    }\n                }\n\n                // Evaluate, unless sleeping or deferEvaluation is true\n                if (!state.isSleeping && !options['deferEvaluation']) {\n                    computedObservable.evaluateImmediate();\n                }\n\n                // Attach a DOM node disposal callback so that the computed will be proactively disposed as soon as the node is\n                // removed using ko.removeNode. But skip if isActive is false (there will never be any dependencies to dispose).\n                if (state.disposeWhenNodeIsRemoved && computedObservable.isActive()) {\n                    ko.utils.domNodeDisposal.addDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback = function () {\n                        computedObservable.dispose();\n                    });\n                }\n\n                return computedObservable;\n            };\n\n// Utility function that disposes a given dependencyTracking entry\n            function computedDisposeDependencyCallback(id, entryToDispose) {\n                if (entryToDispose !== null && entryToDispose.dispose) {\n                    entryToDispose.dispose();\n                }\n            }\n\n// This function gets called each time a dependency is detected while evaluating a computed.\n// It's factored out as a shared function to avoid creating unnecessary function instances during evaluation.\n            function computedBeginDependencyDetectionCallback(subscribable, id) {\n                var computedObservable = this.computedObservable,\n                    state = computedObservable[computedState];\n                if (!state.isDisposed) {\n                    if (this.disposalCount && this.disposalCandidates[id]) {\n                        // Don't want to dispose this subscription, as it's still being used\n                        computedObservable.addDependencyTracking(id, subscribable, this.disposalCandidates[id]);\n                        this.disposalCandidates[id] = null; // No need to actually delete the property - disposalCandidates is a transient object anyway\n                        --this.disposalCount;\n                    } else if (!state.dependencyTracking[id]) {\n                        // Brand new subscription - add it\n                        computedObservable.addDependencyTracking(id, subscribable, state.isSleeping ? { _target: subscribable } : computedObservable.subscribeToDependency(subscribable));\n                    }\n                }\n            }\n\n            var computedFn = {\n                \"equalityComparer\": valuesArePrimitiveAndEqual,\n                getDependenciesCount: function () {\n                    return this[computedState].dependenciesCount;\n                },\n                addDependencyTracking: function (id, target, trackingObj) {\n                    if (this[computedState].pure && target === this) {\n                        throw Error(\"A 'pure' computed must not be called recursively\");\n                    }\n\n                    this[computedState].dependencyTracking[id] = trackingObj;\n                    trackingObj._order = this[computedState].dependenciesCount++;\n                    trackingObj._version = target.getVersion();\n                },\n                haveDependenciesChanged: function () {\n                    var id, dependency, dependencyTracking = this[computedState].dependencyTracking;\n                    for (id in dependencyTracking) {\n                        if (dependencyTracking.hasOwnProperty(id)) {\n                            dependency = dependencyTracking[id];\n                            if (dependency._target.hasChanged(dependency._version)) {\n                                return true;\n                            }\n                        }\n                    }\n                },\n                markDirty: function () {\n                    // Process \"dirty\" events if we can handle delayed notifications\n                    if (this._evalDelayed && !this[computedState].isBeingEvaluated) {\n                        this._evalDelayed();\n                    }\n                },\n                isActive: function () {\n                    return this[computedState].isStale || this[computedState].dependenciesCount > 0;\n                },\n                respondToChange: function () {\n                    // Ignore \"change\" events if we've already scheduled a delayed notification\n                    if (!this._notificationIsPending) {\n                        this.evaluatePossiblyAsync();\n                    }\n                },\n                subscribeToDependency: function (target) {\n                    if (target._deferUpdates && !this[computedState].disposeWhenNodeIsRemoved) {\n                        var dirtySub = target.subscribe(this.markDirty, this, 'dirty'),\n                            changeSub = target.subscribe(this.respondToChange, this);\n                        return {\n                            _target: target,\n                            dispose: function () {\n                                dirtySub.dispose();\n                                changeSub.dispose();\n                            }\n                        };\n                    } else {\n                        return target.subscribe(this.evaluatePossiblyAsync, this);\n                    }\n                },\n                evaluatePossiblyAsync: function () {\n                    var computedObservable = this,\n                        throttleEvaluationTimeout = computedObservable['throttleEvaluation'];\n                    if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {\n                        clearTimeout(this[computedState].evaluationTimeoutInstance);\n                        this[computedState].evaluationTimeoutInstance = ko.utils.setTimeout(function () {\n                            computedObservable.evaluateImmediate(true /*notifyChange*/);\n                        }, throttleEvaluationTimeout);\n                    } else if (computedObservable._evalDelayed) {\n                        computedObservable._evalDelayed();\n                    } else {\n                        computedObservable.evaluateImmediate(true /*notifyChange*/);\n                    }\n                },\n                evaluateImmediate: function (notifyChange) {\n                    var computedObservable = this,\n                        state = computedObservable[computedState],\n                        disposeWhen = state.disposeWhen;\n\n                    if (state.isBeingEvaluated) {\n                        // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.\n                        // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost\n                        // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing\n                        // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387\n                        return;\n                    }\n\n                    // Do not evaluate (and possibly capture new dependencies) if disposed\n                    if (state.isDisposed) {\n                        return;\n                    }\n\n                    if (state.disposeWhenNodeIsRemoved && !ko.utils.domNodeIsAttachedToDocument(state.disposeWhenNodeIsRemoved) || disposeWhen && disposeWhen()) {\n                        // See comment above about suppressDisposalUntilDisposeWhenReturnsFalse\n                        if (!state.suppressDisposalUntilDisposeWhenReturnsFalse) {\n                            computedObservable.dispose();\n                            return;\n                        }\n                    } else {\n                        // It just did return false, so we can stop suppressing now\n                        state.suppressDisposalUntilDisposeWhenReturnsFalse = false;\n                    }\n\n                    state.isBeingEvaluated = true;\n                    try {\n                        this.evaluateImmediate_CallReadWithDependencyDetection(notifyChange);\n                    } finally {\n                        state.isBeingEvaluated = false;\n                    }\n\n                    if (!state.dependenciesCount) {\n                        computedObservable.dispose();\n                    }\n                },\n                evaluateImmediate_CallReadWithDependencyDetection: function (notifyChange) {\n                    // This function is really just part of the evaluateImmediate logic. You would never call it from anywhere else.\n                    // Factoring it out into a separate function means it can be independent of the try/catch block in evaluateImmediate,\n                    // which contributes to saving about 40% off the CPU overhead of computed evaluation (on V8 at least).\n\n                    var computedObservable = this,\n                        state = computedObservable[computedState];\n\n                    // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).\n                    // Then, during evaluation, we cross off any that are in fact still being used.\n                    var isInitial = state.pure ? undefined : !state.dependenciesCount,   // If we're evaluating when there are no previous dependencies, it must be the first time\n                        dependencyDetectionContext = {\n                            computedObservable: computedObservable,\n                            disposalCandidates: state.dependencyTracking,\n                            disposalCount: state.dependenciesCount\n                        };\n\n                    ko.dependencyDetection.begin({\n                        callbackTarget: dependencyDetectionContext,\n                        callback: computedBeginDependencyDetectionCallback,\n                        computed: computedObservable,\n                        isInitial: isInitial\n                    });\n\n                    state.dependencyTracking = {};\n                    state.dependenciesCount = 0;\n\n                    var newValue = this.evaluateImmediate_CallReadThenEndDependencyDetection(state, dependencyDetectionContext);\n\n                    if (computedObservable.isDifferent(state.latestValue, newValue)) {\n                        if (!state.isSleeping) {\n                            computedObservable[\"notifySubscribers\"](state.latestValue, \"beforeChange\");\n                        }\n\n                        state.latestValue = newValue;\n\n                        if (state.isSleeping) {\n                            computedObservable.updateVersion();\n                        } else if (notifyChange) {\n                            computedObservable[\"notifySubscribers\"](state.latestValue);\n                        }\n                    }\n\n                    if (isInitial) {\n                        computedObservable[\"notifySubscribers\"](state.latestValue, \"awake\");\n                    }\n                },\n                evaluateImmediate_CallReadThenEndDependencyDetection: function (state, dependencyDetectionContext) {\n                    // This function is really part of the evaluateImmediate_CallReadWithDependencyDetection logic.\n                    // You'd never call it from anywhere else. Factoring it out means that evaluateImmediate_CallReadWithDependencyDetection\n                    // can be independent of try/finally blocks, which contributes to saving about 40% off the CPU\n                    // overhead of computed evaluation (on V8 at least).\n\n                    try {\n                        var readFunction = state.readFunction;\n                        return state.evaluatorFunctionTarget ? readFunction.call(state.evaluatorFunctionTarget) : readFunction();\n                    } finally {\n                        ko.dependencyDetection.end();\n\n                        // For each subscription no longer being used, remove it from the active subscriptions list and dispose it\n                        if (dependencyDetectionContext.disposalCount && !state.isSleeping) {\n                            ko.utils.objectForEach(dependencyDetectionContext.disposalCandidates, computedDisposeDependencyCallback);\n                        }\n\n                        state.isStale = false;\n                    }\n                },\n                peek: function () {\n                    // Peek won't re-evaluate, except while the computed is sleeping or to get the initial value when \"deferEvaluation\" is set.\n                    var state = this[computedState];\n                    if ((state.isStale && !state.dependenciesCount) || (state.isSleeping && this.haveDependenciesChanged())) {\n                        this.evaluateImmediate();\n                    }\n                    return state.latestValue;\n                },\n                limit: function (limitFunction) {\n                    // Override the limit function with one that delays evaluation as well\n                    ko.subscribable['fn'].limit.call(this, limitFunction);\n                    this._evalDelayed = function () {\n                        this._limitBeforeChange(this[computedState].latestValue);\n\n                        this[computedState].isStale = true; // Mark as dirty\n\n                        // Pass the observable to the \"limit\" code, which will access it when\n                        // it's time to do the notification.\n                        this._limitChange(this);\n                    }\n                },\n                dispose: function () {\n                    var state = this[computedState];\n                    if (!state.isSleeping && state.dependencyTracking) {\n                        ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {\n                            if (dependency.dispose)\n                                dependency.dispose();\n                        });\n                    }\n                    if (state.disposeWhenNodeIsRemoved && state.domNodeDisposalCallback) {\n                        ko.utils.domNodeDisposal.removeDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback);\n                    }\n                    state.dependencyTracking = null;\n                    state.dependenciesCount = 0;\n                    state.isDisposed = true;\n                    state.isStale = false;\n                    state.isSleeping = false;\n                    state.disposeWhenNodeIsRemoved = null;\n                }\n            };\n\n            var pureComputedOverrides = {\n                beforeSubscriptionAdd: function (event) {\n                    // If asleep, wake up the computed by subscribing to any dependencies.\n                    var computedObservable = this,\n                        state = computedObservable[computedState];\n                    if (!state.isDisposed && state.isSleeping && event == 'change') {\n                        state.isSleeping = false;\n                        if (state.isStale || computedObservable.haveDependenciesChanged()) {\n                            state.dependencyTracking = null;\n                            state.dependenciesCount = 0;\n                            state.isStale = true;\n                            computedObservable.evaluateImmediate();\n                        } else {\n                            // First put the dependencies in order\n                            var dependeciesOrder = [];\n                            ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {\n                                dependeciesOrder[dependency._order] = id;\n                            });\n                            // Next, subscribe to each one\n                            ko.utils.arrayForEach(dependeciesOrder, function (id, order) {\n                                var dependency = state.dependencyTracking[id],\n                                    subscription = computedObservable.subscribeToDependency(dependency._target);\n                                subscription._order = order;\n                                subscription._version = dependency._version;\n                                state.dependencyTracking[id] = subscription;\n                            });\n                        }\n                        if (!state.isDisposed) {     // test since evaluating could trigger disposal\n                            computedObservable[\"notifySubscribers\"](state.latestValue, \"awake\");\n                        }\n                    }\n                },\n                afterSubscriptionRemove: function (event) {\n                    var state = this[computedState];\n                    if (!state.isDisposed && event == 'change' && !this.hasSubscriptionsForEvent('change')) {\n                        ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {\n                            if (dependency.dispose) {\n                                state.dependencyTracking[id] = {\n                                    _target: dependency._target,\n                                    _order: dependency._order,\n                                    _version: dependency._version\n                                };\n                                dependency.dispose();\n                            }\n                        });\n                        state.isSleeping = true;\n                        this[\"notifySubscribers\"](undefined, \"asleep\");\n                    }\n                },\n                getVersion: function () {\n                    // Because a pure computed is not automatically updated while it is sleeping, we can't\n                    // simply return the version number. Instead, we check if any of the dependencies have\n                    // changed and conditionally re-evaluate the computed observable.\n                    var state = this[computedState];\n                    if (state.isSleeping && (state.isStale || this.haveDependenciesChanged())) {\n                        this.evaluateImmediate();\n                    }\n                    return ko.subscribable['fn'].getVersion.call(this);\n                }\n            };\n\n            var deferEvaluationOverrides = {\n                beforeSubscriptionAdd: function (event) {\n                    // This will force a computed with deferEvaluation to evaluate when the first subscription is registered.\n                    if (event == 'change' || event == 'beforeChange') {\n                        this.peek();\n                    }\n                }\n            };\n\n// Note that for browsers that don't support proto assignment, the\n// inheritance chain is created manually in the ko.computed constructor\n            if (ko.utils.canSetPrototype) {\n                ko.utils.setPrototypeOf(computedFn, ko.subscribable['fn']);\n            }\n\n// Set the proto chain values for ko.hasPrototype\n            var protoProp = ko.observable.protoProperty; // == \"__ko_proto__\"\n            ko.computed[protoProp] = ko.observable;\n            computedFn[protoProp] = ko.computed;\n\n            ko.isComputed = function (instance) {\n                return ko.hasPrototype(instance, ko.computed);\n            };\n\n            ko.isPureComputed = function (instance) {\n                return ko.hasPrototype(instance, ko.computed)\n                    && instance[computedState] && instance[computedState].pure;\n            };\n\n            ko.exportSymbol('computed', ko.computed);\n            ko.exportSymbol('dependentObservable', ko.computed);    // export ko.dependentObservable for backwards compatibility (1.x)\n            ko.exportSymbol('isComputed', ko.isComputed);\n            ko.exportSymbol('isPureComputed', ko.isPureComputed);\n            ko.exportSymbol('computed.fn', computedFn);\n            ko.exportProperty(computedFn, 'peek', computedFn.peek);\n            ko.exportProperty(computedFn, 'dispose', computedFn.dispose);\n            ko.exportProperty(computedFn, 'isActive', computedFn.isActive);\n            ko.exportProperty(computedFn, 'getDependenciesCount', computedFn.getDependenciesCount);\n\n            ko.pureComputed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget) {\n                if (typeof evaluatorFunctionOrOptions === 'function') {\n                    return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget, {'pure':true});\n                } else {\n                    evaluatorFunctionOrOptions = ko.utils.extend({}, evaluatorFunctionOrOptions);   // make a copy of the parameter object\n                    evaluatorFunctionOrOptions['pure'] = true;\n                    return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget);\n                }\n            }\n            ko.exportSymbol('pureComputed', ko.pureComputed);\n\n            (function() {\n                var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)\n\n                ko.toJS = function(rootObject) {\n                    if (arguments.length == 0)\n                        throw new Error(\"When calling ko.toJS, pass the object you want to convert.\");\n\n                    // We just unwrap everything at every level in the object graph\n                    return mapJsObjectGraph(rootObject, function(valueToMap) {\n                        // Loop because an observable's value might in turn be another observable wrapper\n                        for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)\n                            valueToMap = valueToMap();\n                        return valueToMap;\n                    });\n                };\n\n                ko.toJSON = function(rootObject, replacer, space) {     // replacer and space are optional\n                    var plainJavaScriptObject = ko.toJS(rootObject);\n                    return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);\n                };\n\n                function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {\n                    visitedObjects = visitedObjects || new objectLookup();\n\n                    rootObject = mapInputCallback(rootObject);\n                    var canHaveProperties = (typeof rootObject == \"object\") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof RegExp)) && (!(rootObject instanceof Date)) && (!(rootObject instanceof String)) && (!(rootObject instanceof Number)) && (!(rootObject instanceof Boolean));\n                    if (!canHaveProperties)\n                        return rootObject;\n\n                    var outputProperties = rootObject instanceof Array ? [] : {};\n                    visitedObjects.save(rootObject, outputProperties);\n\n                    visitPropertiesOrArrayEntries(rootObject, function(indexer) {\n                        var propertyValue = mapInputCallback(rootObject[indexer]);\n\n                        switch (typeof propertyValue) {\n                            case \"boolean\":\n                            case \"number\":\n                            case \"string\":\n                            case \"function\":\n                                outputProperties[indexer] = propertyValue;\n                                break;\n                            case \"object\":\n                            case \"undefined\":\n                                var previouslyMappedValue = visitedObjects.get(propertyValue);\n                                outputProperties[indexer] = (previouslyMappedValue !== undefined)\n                                    ? previouslyMappedValue\n                                    : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);\n                                break;\n                        }\n                    });\n\n                    return outputProperties;\n                }\n\n                function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {\n                    if (rootObject instanceof Array) {\n                        for (var i = 0; i < rootObject.length; i++)\n                            visitorCallback(i);\n\n                        // For arrays, also respect toJSON property for custom mappings (fixes #278)\n                        if (typeof rootObject['toJSON'] == 'function')\n                            visitorCallback('toJSON');\n                    } else {\n                        for (var propertyName in rootObject) {\n                            visitorCallback(propertyName);\n                        }\n                    }\n                };\n\n                function objectLookup() {\n                    this.keys = [];\n                    this.values = [];\n                };\n\n                objectLookup.prototype = {\n                    constructor: objectLookup,\n                    save: function(key, value) {\n                        var existingIndex = ko.utils.arrayIndexOf(this.keys, key);\n                        if (existingIndex >= 0)\n                            this.values[existingIndex] = value;\n                        else {\n                            this.keys.push(key);\n                            this.values.push(value);\n                        }\n                    },\n                    get: function(key) {\n                        var existingIndex = ko.utils.arrayIndexOf(this.keys, key);\n                        return (existingIndex >= 0) ? this.values[existingIndex] : undefined;\n                    }\n                };\n            })();\n\n            ko.exportSymbol('toJS', ko.toJS);\n            ko.exportSymbol('toJSON', ko.toJSON);\n            (function () {\n                var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';\n\n                // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values\n                // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values\n                // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.\n                ko.selectExtensions = {\n                    readValue : function(element) {\n                        switch (ko.utils.tagNameLower(element)) {\n                            case 'option':\n                                if (element[hasDomDataExpandoProperty] === true)\n                                    return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);\n                                return ko.utils.ieVersion <= 7\n                                    ? (element.getAttributeNode('value') && element.getAttributeNode('value').specified ? element.value : element.text)\n                                    : element.value;\n                            case 'select':\n                                return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;\n                            default:\n                                return element.value;\n                        }\n                    },\n\n                    writeValue: function(element, value, allowUnset) {\n                        switch (ko.utils.tagNameLower(element)) {\n                            case 'option':\n                                switch(typeof value) {\n                                    case \"string\":\n                                        ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);\n                                        if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node\n                                            delete element[hasDomDataExpandoProperty];\n                                        }\n                                        element.value = value;\n                                        break;\n                                    default:\n                                        // Store arbitrary object using DomData\n                                        ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);\n                                        element[hasDomDataExpandoProperty] = true;\n\n                                        // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.\n                                        element.value = typeof value === \"number\" ? value : \"\";\n                                        break;\n                                }\n                                break;\n                            case 'select':\n                                if (value === \"\" || value === null)       // A blank string or null value will select the caption\n                                    value = undefined;\n                                var selection = -1;\n                                for (var i = 0, n = element.options.length, optionValue; i < n; ++i) {\n                                    optionValue = ko.selectExtensions.readValue(element.options[i]);\n                                    // Include special check to handle selecting a caption with a blank string value\n                                    if (optionValue == value || (optionValue == \"\" && value === undefined)) {\n                                        selection = i;\n                                        break;\n                                    }\n                                }\n                                if (allowUnset || selection >= 0 || (value === undefined && element.size > 1)) {\n                                    element.selectedIndex = selection;\n                                }\n                                break;\n                            default:\n                                if ((value === null) || (value === undefined))\n                                    value = \"\";\n                                element.value = value;\n                                break;\n                        }\n                    }\n                };\n            })();\n\n            ko.exportSymbol('selectExtensions', ko.selectExtensions);\n            ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);\n            ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);\n            ko.expressionRewriting = (function () {\n                var javaScriptReservedWords = [\"true\", \"false\", \"null\", \"undefined\"];\n\n                // Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor\n                // This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).\n                // This also will not properly handle nested brackets (e.g., obj1[obj2['prop']]; see #911).\n                var javaScriptAssignmentTarget = /^(?:[$_a-z][$\\w]*|(.+)(\\.\\s*[$_a-z][$\\w]*|\\[.+\\]))$/i;\n\n                function getWriteableValue(expression) {\n                    if (ko.utils.arrayIndexOf(javaScriptReservedWords, expression) >= 0)\n                        return false;\n                    var match = expression.match(javaScriptAssignmentTarget);\n                    return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;\n                }\n\n                // The following regular expressions will be used to split an object-literal string into tokens\n\n                // These two match strings, either with double quotes or single quotes\n                var stringDouble = '\"(?:[^\"\\\\\\\\]|\\\\\\\\.)*\"',\n                    stringSingle = \"'(?:[^'\\\\\\\\]|\\\\\\\\.)*'\",\n                // Matches a regular expression (text enclosed by slashes), but will also match sets of divisions\n                // as a regular expression (this is handled by the parsing loop below).\n                    stringRegexp = '/(?:[^/\\\\\\\\]|\\\\\\\\.)*/\\w*',\n                // These characters have special meaning to the parser and must not appear in the middle of a\n                // token, except as part of a string.\n                    specials = ',\"\\'{}()/:[\\\\]',\n                // Match text (at least two characters) that does not contain any of the above special characters,\n                // although some of the special characters are allowed to start it (all but the colon and comma).\n                // The text can contain spaces, but leading or trailing spaces are skipped.\n                    everyThingElse = '[^\\\\s:,/][^' + specials + ']*[^\\\\s' + specials + ']',\n                // Match any non-space character not matched already. This will match colons and commas, since they're\n                // not matched by \"everyThingElse\", but will also match any other single character that wasn't already\n                // matched (for example: in \"a: 1, b: 2\", each of the non-space characters will be matched by oneNotSpace).\n                    oneNotSpace = '[^\\\\s]',\n\n                // Create the actual regular expression by or-ing the above strings. The order is important.\n                    bindingToken = RegExp(stringDouble + '|' + stringSingle + '|' + stringRegexp + '|' + everyThingElse + '|' + oneNotSpace, 'g'),\n\n                // Match end of previous token to determine whether a slash is a division or regex.\n                    divisionLookBehind = /[\\])\"'A-Za-z0-9_$]+$/,\n                    keywordRegexLookBehind = {'in':1,'return':1,'typeof':1};\n\n                function parseObjectLiteral(objectLiteralString) {\n                    // Trim leading and trailing spaces from the string\n                    var str = ko.utils.stringTrim(objectLiteralString);\n\n                    // Trim braces '{' surrounding the whole object literal\n                    if (str.charCodeAt(0) === 123) str = str.slice(1, -1);\n\n                    // Split into tokens\n                    var result = [], toks = str.match(bindingToken), key, values = [], depth = 0;\n\n                    if (toks) {\n                        // Append a comma so that we don't need a separate code block to deal with the last item\n                        toks.push(',');\n\n                        for (var i = 0, tok; tok = toks[i]; ++i) {\n                            var c = tok.charCodeAt(0);\n                            // A comma signals the end of a key/value pair if depth is zero\n                            if (c === 44) { // \",\"\n                                if (depth <= 0) {\n                                    result.push((key && values.length) ? {key: key, value: values.join('')} : {'unknown': key || values.join('')});\n                                    key = depth = 0;\n                                    values = [];\n                                    continue;\n                                }\n                                // Simply skip the colon that separates the name and value\n                            } else if (c === 58) { // \":\"\n                                if (!depth && !key && values.length === 1) {\n                                    key = values.pop();\n                                    continue;\n                                }\n                                // A set of slashes is initially matched as a regular expression, but could be division\n                            } else if (c === 47 && i && tok.length > 1) {  // \"/\"\n                                // Look at the end of the previous token to determine if the slash is actually division\n                                var match = toks[i-1].match(divisionLookBehind);\n                                if (match && !keywordRegexLookBehind[match[0]]) {\n                                    // The slash is actually a division punctuator; re-parse the remainder of the string (not including the slash)\n                                    str = str.substr(str.indexOf(tok) + 1);\n                                    toks = str.match(bindingToken);\n                                    toks.push(',');\n                                    i = -1;\n                                    // Continue with just the slash\n                                    tok = '/';\n                                }\n                                // Increment depth for parentheses, braces, and brackets so that interior commas are ignored\n                            } else if (c === 40 || c === 123 || c === 91) { // '(', '{', '['\n                                ++depth;\n                            } else if (c === 41 || c === 125 || c === 93) { // ')', '}', ']'\n                                --depth;\n                                // The key will be the first token; if it's a string, trim the quotes\n                            } else if (!key && !values.length && (c === 34 || c === 39)) { // '\"', \"'\"\n                                tok = tok.slice(1, -1);\n                            }\n                            values.push(tok);\n                        }\n                    }\n                    return result;\n                }\n\n                // Two-way bindings include a write function that allow the handler to update the value even if it's not an observable.\n                var twoWayBindings = {};\n\n                function preProcessBindings(bindingsStringOrKeyValueArray, bindingOptions) {\n                    bindingOptions = bindingOptions || {};\n\n                    function processKeyValue(key, val) {\n                        var writableVal;\n                        function callPreprocessHook(obj) {\n                            return (obj && obj['preprocess']) ? (val = obj['preprocess'](val, key, processKeyValue)) : true;\n                        }\n                        if (!bindingParams) {\n                            if (!callPreprocessHook(ko['getBindingHandler'](key)))\n                                return;\n\n                            if (twoWayBindings[key] && (writableVal = getWriteableValue(val))) {\n                                // For two-way bindings, provide a write method in case the value\n                                // isn't a writable observable.\n                                propertyAccessorResultStrings.push(\"'\" + key + \"':function(_z){\" + writableVal + \"=_z}\");\n                            }\n                        }\n                        // Values are wrapped in a function so that each value can be accessed independently\n                        if (makeValueAccessors) {\n                            val = 'function(){return ' + val + ' }';\n                        }\n                        resultStrings.push(\"'\" + key + \"':\" + val);\n                    }\n\n                    var resultStrings = [],\n                        propertyAccessorResultStrings = [],\n                        makeValueAccessors = bindingOptions['valueAccessors'],\n                        bindingParams = bindingOptions['bindingParams'],\n                        keyValueArray = typeof bindingsStringOrKeyValueArray === \"string\" ?\n                            parseObjectLiteral(bindingsStringOrKeyValueArray) : bindingsStringOrKeyValueArray;\n\n                    ko.utils.arrayForEach(keyValueArray, function(keyValue) {\n                        processKeyValue(keyValue.key || keyValue['unknown'], keyValue.value);\n                    });\n\n                    if (propertyAccessorResultStrings.length)\n                        processKeyValue('_ko_property_writers', \"{\" + propertyAccessorResultStrings.join(\",\") + \" }\");\n\n                    return resultStrings.join(\",\");\n                }\n\n                return {\n                    bindingRewriteValidators: [],\n\n                    twoWayBindings: twoWayBindings,\n\n                    parseObjectLiteral: parseObjectLiteral,\n\n                    preProcessBindings: preProcessBindings,\n\n                    keyValueArrayContainsKey: function(keyValueArray, key) {\n                        for (var i = 0; i < keyValueArray.length; i++)\n                            if (keyValueArray[i]['key'] == key)\n                                return true;\n                        return false;\n                    },\n\n                    // Internal, private KO utility for updating model properties from within bindings\n                    // property:            If the property being updated is (or might be) an observable, pass it here\n                    //                      If it turns out to be a writable observable, it will be written to directly\n                    // allBindings:         An object with a get method to retrieve bindings in the current execution context.\n                    //                      This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable\n                    // key:                 The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'\n                    // value:               The value to be written\n                    // checkIfDifferent:    If true, and if the property being written is a writable observable, the value will only be written if\n                    //                      it is !== existing value on that writable observable\n                    writeValueToProperty: function(property, allBindings, key, value, checkIfDifferent) {\n                        if (!property || !ko.isObservable(property)) {\n                            var propWriters = allBindings.get('_ko_property_writers');\n                            if (propWriters && propWriters[key])\n                                propWriters[key](value);\n                        } else if (ko.isWriteableObservable(property) && (!checkIfDifferent || property.peek() !== value)) {\n                            property(value);\n                        }\n                    }\n                };\n            })();\n\n            ko.exportSymbol('expressionRewriting', ko.expressionRewriting);\n            ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);\n            ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);\n            ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);\n\n// Making bindings explicitly declare themselves as \"two way\" isn't ideal in the long term (it would be better if\n// all bindings could use an official 'property writer' API without needing to declare that they might). However,\n// since this is not, and has never been, a public API (_ko_property_writers was never documented), it's acceptable\n// as an internal implementation detail in the short term.\n// For those developers who rely on _ko_property_writers in their custom bindings, we expose _twoWayBindings as an\n// undocumented feature that makes it relatively easy to upgrade to KO 3.0. However, this is still not an official\n// public API, and we reserve the right to remove it at any time if we create a real public property writers API.\n            ko.exportSymbol('expressionRewriting._twoWayBindings', ko.expressionRewriting.twoWayBindings);\n\n// For backward compatibility, define the following aliases. (Previously, these function names were misleading because\n// they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)\n            ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);\n            ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);\n            (function() {\n                // \"Virtual elements\" is an abstraction on top of the usual DOM API which understands the notion that comment nodes\n                // may be used to represent hierarchy (in addition to the DOM's natural hierarchy).\n                // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state\n                // of that virtual hierarchy\n                //\n                // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)\n                // without having to scatter special cases all over the binding and templating code.\n\n                // IE 9 cannot reliably read the \"nodeValue\" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)\n                // but it does give them a nonstandard alternative property called \"text\" that it can read reliably. Other browsers don't have that property.\n                // So, use node.text where available, and node.nodeValue elsewhere\n                var commentNodesHaveTextProperty = document && document.createComment(\"test\").text === \"<!--test-->\";\n\n                var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\\s*ko(?:\\s+([\\s\\S]+))?\\s*-->$/ : /^\\s*ko(?:\\s+([\\s\\S]+))?\\s*$/;\n                var endCommentRegex =   commentNodesHaveTextProperty ? /^<!--\\s*\\/ko\\s*-->$/ : /^\\s*\\/ko\\s*$/;\n                var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };\n\n                function isStartComment(node) {\n                    return (node.nodeType == 8) && startCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);\n                }\n\n                function isEndComment(node) {\n                    return (node.nodeType == 8) && endCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);\n                }\n\n                function getVirtualChildren(startComment, allowUnbalanced) {\n                    var currentNode = startComment;\n                    var depth = 1;\n                    var children = [];\n                    while (currentNode = currentNode.nextSibling) {\n                        if (isEndComment(currentNode)) {\n                            depth--;\n                            if (depth === 0)\n                                return children;\n                        }\n\n                        children.push(currentNode);\n\n                        if (isStartComment(currentNode))\n                            depth++;\n                    }\n                    if (!allowUnbalanced)\n                        throw new Error(\"Cannot find closing comment tag to match: \" + startComment.nodeValue);\n                    return null;\n                }\n\n                function getMatchingEndComment(startComment, allowUnbalanced) {\n                    var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);\n                    if (allVirtualChildren) {\n                        if (allVirtualChildren.length > 0)\n                            return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;\n                        return startComment.nextSibling;\n                    } else\n                        return null; // Must have no matching end comment, and allowUnbalanced is true\n                }\n\n                function getUnbalancedChildTags(node) {\n                    // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>\n                    //       from <div>OK</div><!-- /ko --><!-- /ko -->,             returns: <!-- /ko --><!-- /ko -->\n                    var childNode = node.firstChild, captureRemaining = null;\n                    if (childNode) {\n                        do {\n                            if (captureRemaining)                   // We already hit an unbalanced node and are now just scooping up all subsequent nodes\n                                captureRemaining.push(childNode);\n                            else if (isStartComment(childNode)) {\n                                var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);\n                                if (matchingEndComment)             // It's a balanced tag, so skip immediately to the end of this virtual set\n                                    childNode = matchingEndComment;\n                                else\n                                    captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point\n                            } else if (isEndComment(childNode)) {\n                                captureRemaining = [childNode];     // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing\n                            }\n                        } while (childNode = childNode.nextSibling);\n                    }\n                    return captureRemaining;\n                }\n\n                ko.virtualElements = {\n                    allowedBindings: {},\n\n                    childNodes: function(node) {\n                        return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;\n                    },\n\n                    emptyNode: function(node) {\n                        if (!isStartComment(node))\n                            ko.utils.emptyDomNode(node);\n                        else {\n                            var virtualChildren = ko.virtualElements.childNodes(node);\n                            for (var i = 0, j = virtualChildren.length; i < j; i++)\n                                ko.removeNode(virtualChildren[i]);\n                        }\n                    },\n\n                    setDomNodeChildren: function(node, childNodes) {\n                        if (!isStartComment(node))\n                            ko.utils.setDomNodeChildren(node, childNodes);\n                        else {\n                            ko.virtualElements.emptyNode(node);\n                            var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children\n                            for (var i = 0, j = childNodes.length; i < j; i++)\n                                endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);\n                        }\n                    },\n\n                    prepend: function(containerNode, nodeToPrepend) {\n                        if (!isStartComment(containerNode)) {\n                            if (containerNode.firstChild)\n                                containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);\n                            else\n                                containerNode.appendChild(nodeToPrepend);\n                        } else {\n                            // Start comments must always have a parent and at least one following sibling (the end comment)\n                            containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);\n                        }\n                    },\n\n                    insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {\n                        if (!insertAfterNode) {\n                            ko.virtualElements.prepend(containerNode, nodeToInsert);\n                        } else if (!isStartComment(containerNode)) {\n                            // Insert after insertion point\n                            if (insertAfterNode.nextSibling)\n                                containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);\n                            else\n                                containerNode.appendChild(nodeToInsert);\n                        } else {\n                            // Children of start comments must always have a parent and at least one following sibling (the end comment)\n                            containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);\n                        }\n                    },\n\n                    firstChild: function(node) {\n                        if (!isStartComment(node))\n                            return node.firstChild;\n                        if (!node.nextSibling || isEndComment(node.nextSibling))\n                            return null;\n                        return node.nextSibling;\n                    },\n\n                    nextSibling: function(node) {\n                        if (isStartComment(node))\n                            node = getMatchingEndComment(node);\n                        if (node.nextSibling && isEndComment(node.nextSibling))\n                            return null;\n                        return node.nextSibling;\n                    },\n\n                    hasBindingValue: isStartComment,\n\n                    virtualNodeBindingValue: function(node) {\n                        var regexMatch = (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);\n                        return regexMatch ? regexMatch[1] : null;\n                    },\n\n                    normaliseVirtualElementDomStructure: function(elementVerified) {\n                        // Workaround for https://github.com/SteveSanderson/knockout/issues/155\n                        // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes\n                        // that are direct descendants of <ul> into the preceding <li>)\n                        if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])\n                            return;\n\n                        // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags\n                        // must be intended to appear *after* that child, so move them there.\n                        var childNode = elementVerified.firstChild;\n                        if (childNode) {\n                            do {\n                                if (childNode.nodeType === 1) {\n                                    var unbalancedTags = getUnbalancedChildTags(childNode);\n                                    if (unbalancedTags) {\n                                        // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child\n                                        var nodeToInsertBefore = childNode.nextSibling;\n                                        for (var i = 0; i < unbalancedTags.length; i++) {\n                                            if (nodeToInsertBefore)\n                                                elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);\n                                            else\n                                                elementVerified.appendChild(unbalancedTags[i]);\n                                        }\n                                    }\n                                }\n                            } while (childNode = childNode.nextSibling);\n                        }\n                    }\n                };\n            })();\n            ko.exportSymbol('virtualElements', ko.virtualElements);\n            ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);\n            ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);\n//ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild);     // firstChild is not minified\n            ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);\n//ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling);   // nextSibling is not minified\n            ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);\n            ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);\n            (function() {\n                var defaultBindingAttributeName = \"data-bind\";\n\n                ko.bindingProvider = function() {\n                    this.bindingCache = {};\n                };\n\n                ko.utils.extend(ko.bindingProvider.prototype, {\n                    'nodeHasBindings': function(node) {\n                        switch (node.nodeType) {\n                            case 1: // Element\n                                return node.getAttribute(defaultBindingAttributeName) != null\n                                    || ko.components['getComponentNameForNode'](node);\n                            case 8: // Comment node\n                                return ko.virtualElements.hasBindingValue(node);\n                            default: return false;\n                        }\n                    },\n\n                    'getBindings': function(node, bindingContext) {\n                        var bindingsString = this['getBindingsString'](node, bindingContext),\n                            parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;\n                        return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ false);\n                    },\n\n                    'getBindingAccessors': function(node, bindingContext) {\n                        var bindingsString = this['getBindingsString'](node, bindingContext),\n                            parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node, { 'valueAccessors': true }) : null;\n                        return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ true);\n                    },\n\n                    // The following function is only used internally by this default provider.\n                    // It's not part of the interface definition for a general binding provider.\n                    'getBindingsString': function(node, bindingContext) {\n                        switch (node.nodeType) {\n                            case 1: return node.getAttribute(defaultBindingAttributeName);   // Element\n                            case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node\n                            default: return null;\n                        }\n                    },\n\n                    // The following function is only used internally by this default provider.\n                    // It's not part of the interface definition for a general binding provider.\n                    'parseBindingsString': function(bindingsString, bindingContext, node, options) {\n                        try {\n                            var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache, options);\n                            return bindingFunction(bindingContext, node);\n                        } catch (ex) {\n                            ex.message = \"Unable to parse bindings.\\nBindings value: \" + bindingsString + \"\\nMessage: \" + ex.message;\n                            throw ex;\n                        }\n                    }\n                });\n\n                ko.bindingProvider['instance'] = new ko.bindingProvider();\n\n                function createBindingsStringEvaluatorViaCache(bindingsString, cache, options) {\n                    var cacheKey = bindingsString + (options && options['valueAccessors'] || '');\n                    return cache[cacheKey]\n                        || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, options));\n                }\n\n                function createBindingsStringEvaluator(bindingsString, options) {\n                    // Build the source for a function that evaluates \"expression\"\n                    // For each scope variable, add an extra level of \"with\" nesting\n                    // Example result: with(sc1) { with(sc0) { return (expression) } }\n                    var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options),\n                        functionBody = \"with($context){with($data||{}){return{\" + rewrittenBindings + \"}}}\";\n                    return new Function(\"$context\", \"$element\", functionBody);\n                }\n            })();\n\n            ko.exportSymbol('bindingProvider', ko.bindingProvider);\n            (function () {\n                ko.bindingHandlers = {};\n\n                // The following element types will not be recursed into during binding.\n                var bindingDoesNotRecurseIntoElementTypes = {\n                    // Don't want bindings that operate on text nodes to mutate <script> and <textarea> contents,\n                    // because it's unexpected and a potential XSS issue.\n                    // Also bindings should not operate on <template> elements since this breaks in Internet Explorer\n                    // and because such elements' contents are always intended to be bound in a different context\n                    // from where they appear in the document.\n                    'script': true,\n                    'textarea': true,\n                    'template': true\n                };\n\n                // Use an overridable method for retrieving binding handlers so that a plugins may support dynamically created handlers\n                ko['getBindingHandler'] = function(bindingKey) {\n                    return ko.bindingHandlers[bindingKey];\n                };\n\n                // The ko.bindingContext constructor is only called directly to create the root context. For child\n                // contexts, use bindingContext.createChildContext or bindingContext.extend.\n                ko.bindingContext = function(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback) {\n\n                    // The binding context object includes static properties for the current, parent, and root view models.\n                    // If a view model is actually stored in an observable, the corresponding binding context object, and\n                    // any child contexts, must be updated when the view model is changed.\n                    function updateContext() {\n                        // Most of the time, the context will directly get a view model object, but if a function is given,\n                        // we call the function to retrieve the view model. If the function accesses any observables or returns\n                        // an observable, the dependency is tracked, and those observables can later cause the binding\n                        // context to be updated.\n                        var dataItemOrObservable = isFunc ? dataItemOrAccessor() : dataItemOrAccessor,\n                            dataItem = ko.utils.unwrapObservable(dataItemOrObservable);\n\n                        if (parentContext) {\n                            // When a \"parent\" context is given, register a dependency on the parent context. Thus whenever the\n                            // parent context is updated, this context will also be updated.\n                            if (parentContext._subscribable)\n                                parentContext._subscribable();\n\n                            // Copy $root and any custom properties from the parent context\n                            ko.utils.extend(self, parentContext);\n\n                            // Because the above copy overwrites our own properties, we need to reset them.\n                            // During the first execution, \"subscribable\" isn't set, so don't bother doing the update then.\n                            if (subscribable) {\n                                self._subscribable = subscribable;\n                            }\n                        } else {\n                            self['$parents'] = [];\n                            self['$root'] = dataItem;\n\n                            // Export 'ko' in the binding context so it will be available in bindings and templates\n                            // even if 'ko' isn't exported as a global, such as when using an AMD loader.\n                            // See https://github.com/SteveSanderson/knockout/issues/490\n                            self['ko'] = ko;\n                        }\n                        self['$rawData'] = dataItemOrObservable;\n                        self['$data'] = dataItem;\n                        if (dataItemAlias)\n                            self[dataItemAlias] = dataItem;\n\n                        // The extendCallback function is provided when creating a child context or extending a context.\n                        // It handles the specific actions needed to finish setting up the binding context. Actions in this\n                        // function could also add dependencies to this binding context.\n                        if (extendCallback)\n                            extendCallback(self, parentContext, dataItem);\n\n                        return self['$data'];\n                    }\n                    function disposeWhen() {\n                        return nodes && !ko.utils.anyDomNodeIsAttachedToDocument(nodes);\n                    }\n\n                    var self = this,\n                        isFunc = typeof(dataItemOrAccessor) == \"function\" && !ko.isObservable(dataItemOrAccessor),\n                        nodes,\n                        subscribable = ko.dependentObservable(updateContext, null, { disposeWhen: disposeWhen, disposeWhenNodeIsRemoved: true });\n\n                    // At this point, the binding context has been initialized, and the \"subscribable\" computed observable is\n                    // subscribed to any observables that were accessed in the process. If there is nothing to track, the\n                    // computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in\n                    // the context object.\n                    if (subscribable.isActive()) {\n                        self._subscribable = subscribable;\n\n                        // Always notify because even if the model ($data) hasn't changed, other context properties might have changed\n                        subscribable['equalityComparer'] = null;\n\n                        // We need to be able to dispose of this computed observable when it's no longer needed. This would be\n                        // easy if we had a single node to watch, but binding contexts can be used by many different nodes, and\n                        // we cannot assume that those nodes have any relation to each other. So instead we track any node that\n                        // the context is attached to, and dispose the computed when all of those nodes have been cleaned.\n\n                        // Add properties to *subscribable* instead of *self* because any properties added to *self* may be overwritten on updates\n                        nodes = [];\n                        subscribable._addNode = function(node) {\n                            nodes.push(node);\n                            ko.utils.domNodeDisposal.addDisposeCallback(node, function(node) {\n                                ko.utils.arrayRemoveItem(nodes, node);\n                                if (!nodes.length) {\n                                    subscribable.dispose();\n                                    self._subscribable = subscribable = undefined;\n                                }\n                            });\n                        };\n                    }\n                }\n\n                // Extend the binding context hierarchy with a new view model object. If the parent context is watching\n                // any observables, the new child context will automatically get a dependency on the parent context.\n                // But this does not mean that the $data value of the child context will also get updated. If the child\n                // view model also depends on the parent view model, you must provide a function that returns the correct\n                // view model on each update.\n                ko.bindingContext.prototype['createChildContext'] = function (dataItemOrAccessor, dataItemAlias, extendCallback) {\n                    return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, function(self, parentContext) {\n                        // Extend the context hierarchy by setting the appropriate pointers\n                        self['$parentContext'] = parentContext;\n                        self['$parent'] = parentContext['$data'];\n                        self['$parents'] = (parentContext['$parents'] || []).slice(0);\n                        self['$parents'].unshift(self['$parent']);\n                        if (extendCallback)\n                            extendCallback(self);\n                    });\n                };\n\n                // Extend the binding context with new custom properties. This doesn't change the context hierarchy.\n                // Similarly to \"child\" contexts, provide a function here to make sure that the correct values are set\n                // when an observable view model is updated.\n                ko.bindingContext.prototype['extend'] = function(properties) {\n                    // If the parent context references an observable view model, \"_subscribable\" will always be the\n                    // latest view model object. If not, \"_subscribable\" isn't set, and we can use the static \"$data\" value.\n                    return new ko.bindingContext(this._subscribable || this['$data'], this, null, function(self, parentContext) {\n                        // This \"child\" context doesn't directly track a parent observable view model,\n                        // so we need to manually set the $rawData value to match the parent.\n                        self['$rawData'] = parentContext['$rawData'];\n                        ko.utils.extend(self, typeof(properties) == \"function\" ? properties() : properties);\n                    });\n                };\n\n                // Returns the valueAccesor function for a binding value\n                function makeValueAccessor(value) {\n                    return function() {\n                        return value;\n                    };\n                }\n\n                // Returns the value of a valueAccessor function\n                function evaluateValueAccessor(valueAccessor) {\n                    return valueAccessor();\n                }\n\n                // Given a function that returns bindings, create and return a new object that contains\n                // binding value-accessors functions. Each accessor function calls the original function\n                // so that it always gets the latest value and all dependencies are captured. This is used\n                // by ko.applyBindingsToNode and getBindingsAndMakeAccessors.\n                function makeAccessorsFromFunction(callback) {\n                    return ko.utils.objectMap(ko.dependencyDetection.ignore(callback), function(value, key) {\n                        return function() {\n                            return callback()[key];\n                        };\n                    });\n                }\n\n                // Given a bindings function or object, create and return a new object that contains\n                // binding value-accessors functions. This is used by ko.applyBindingsToNode.\n                function makeBindingAccessors(bindings, context, node) {\n                    if (typeof bindings === 'function') {\n                        return makeAccessorsFromFunction(bindings.bind(null, context, node));\n                    } else {\n                        return ko.utils.objectMap(bindings, makeValueAccessor);\n                    }\n                }\n\n                // This function is used if the binding provider doesn't include a getBindingAccessors function.\n                // It must be called with 'this' set to the provider instance.\n                function getBindingsAndMakeAccessors(node, context) {\n                    return makeAccessorsFromFunction(this['getBindings'].bind(this, node, context));\n                }\n\n                function validateThatBindingIsAllowedForVirtualElements(bindingName) {\n                    var validator = ko.virtualElements.allowedBindings[bindingName];\n                    if (!validator)\n                        throw new Error(\"The binding '\" + bindingName + \"' cannot be used with virtual elements\")\n                }\n\n                function applyBindingsToDescendantsInternal (bindingContext, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {\n                    var currentChild,\n                        nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement),\n                        provider = ko.bindingProvider['instance'],\n                        preprocessNode = provider['preprocessNode'];\n\n                    // Preprocessing allows a binding provider to mutate a node before bindings are applied to it. For example it's\n                    // possible to insert new siblings after it, and/or replace the node with a different one. This can be used to\n                    // implement custom binding syntaxes, such as {{ value }} for string interpolation, or custom element types that\n                    // trigger insertion of <template> contents at that point in the document.\n                    if (preprocessNode) {\n                        while (currentChild = nextInQueue) {\n                            nextInQueue = ko.virtualElements.nextSibling(currentChild);\n                            preprocessNode.call(provider, currentChild);\n                        }\n                        // Reset nextInQueue for the next loop\n                        nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);\n                    }\n\n                    while (currentChild = nextInQueue) {\n                        // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position\n                        nextInQueue = ko.virtualElements.nextSibling(currentChild);\n                        applyBindingsToNodeAndDescendantsInternal(bindingContext, currentChild, bindingContextsMayDifferFromDomParentElement);\n                    }\n                }\n\n                function applyBindingsToNodeAndDescendantsInternal (bindingContext, nodeVerified, bindingContextMayDifferFromDomParentElement) {\n                    var shouldBindDescendants = true;\n\n                    // Perf optimisation: Apply bindings only if...\n                    // (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)\n                    //     Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those\n                    // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)\n                    var isElement = (nodeVerified.nodeType === 1);\n                    if (isElement) // Workaround IE <= 8 HTML parsing weirdness\n                        ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);\n\n                    var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement)             // Case (1)\n                        || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified);       // Case (2)\n                    if (shouldApplyBindings)\n                        shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, bindingContext, bindingContextMayDifferFromDomParentElement)['shouldBindDescendants'];\n\n                    if (shouldBindDescendants && !bindingDoesNotRecurseIntoElementTypes[ko.utils.tagNameLower(nodeVerified)]) {\n                        // We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,\n                        //  * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,\n                        //    hence bindingContextsMayDifferFromDomParentElement is false\n                        //  * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may\n                        //    skip over any number of intermediate virtual elements, any of which might define a custom binding context,\n                        //    hence bindingContextsMayDifferFromDomParentElement is true\n                        applyBindingsToDescendantsInternal(bindingContext, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);\n                    }\n                }\n\n                var boundElementDomDataKey = ko.utils.domData.nextKey();\n\n\n                function topologicalSortBindings(bindings) {\n                    // Depth-first sort\n                    var result = [],                // The list of key/handler pairs that we will return\n                        bindingsConsidered = {},    // A temporary record of which bindings are already in 'result'\n                        cyclicDependencyStack = []; // Keeps track of a depth-search so that, if there's a cycle, we know which bindings caused it\n                    ko.utils.objectForEach(bindings, function pushBinding(bindingKey) {\n                        if (!bindingsConsidered[bindingKey]) {\n                            var binding = ko['getBindingHandler'](bindingKey);\n                            if (binding) {\n                                // First add dependencies (if any) of the current binding\n                                if (binding['after']) {\n                                    cyclicDependencyStack.push(bindingKey);\n                                    ko.utils.arrayForEach(binding['after'], function(bindingDependencyKey) {\n                                        if (bindings[bindingDependencyKey]) {\n                                            if (ko.utils.arrayIndexOf(cyclicDependencyStack, bindingDependencyKey) !== -1) {\n                                                throw Error(\"Cannot combine the following bindings, because they have a cyclic dependency: \" + cyclicDependencyStack.join(\", \"));\n                                            } else {\n                                                pushBinding(bindingDependencyKey);\n                                            }\n                                        }\n                                    });\n                                    cyclicDependencyStack.length--;\n                                }\n                                // Next add the current binding\n                                result.push({ key: bindingKey, handler: binding });\n                            }\n                            bindingsConsidered[bindingKey] = true;\n                        }\n                    });\n\n                    return result;\n                }\n\n                function applyBindingsToNodeInternal(node, sourceBindings, bindingContext, bindingContextMayDifferFromDomParentElement) {\n                    // Prevent multiple applyBindings calls for the same node, except when a binding value is specified\n                    var alreadyBound = ko.utils.domData.get(node, boundElementDomDataKey);\n                    if (!sourceBindings) {\n                        if (alreadyBound) {\n                            throw Error(\"You cannot apply bindings multiple times to the same element.\");\n                        }\n                        ko.utils.domData.set(node, boundElementDomDataKey, true);\n                    }\n\n                    // Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because\n                    // we can easily recover it just by scanning up the node's ancestors in the DOM\n                    // (note: here, parent node means \"real DOM parent\" not \"virtual parent\", as there's no O(1) way to find the virtual parent)\n                    if (!alreadyBound && bindingContextMayDifferFromDomParentElement)\n                        ko.storedBindingContextForNode(node, bindingContext);\n\n                    // Use bindings if given, otherwise fall back on asking the bindings provider to give us some bindings\n                    var bindings;\n                    if (sourceBindings && typeof sourceBindings !== 'function') {\n                        bindings = sourceBindings;\n                    } else {\n                        var provider = ko.bindingProvider['instance'],\n                            getBindings = provider['getBindingAccessors'] || getBindingsAndMakeAccessors;\n\n                        // Get the binding from the provider within a computed observable so that we can update the bindings whenever\n                        // the binding context is updated or if the binding provider accesses observables.\n                        var bindingsUpdater = ko.dependentObservable(\n                            function() {\n                                bindings = sourceBindings ? sourceBindings(bindingContext, node) : getBindings.call(provider, node, bindingContext);\n                                // Register a dependency on the binding context to support observable view models.\n                                if (bindings && bindingContext._subscribable)\n                                    bindingContext._subscribable();\n                                return bindings;\n                            },\n                            null, { disposeWhenNodeIsRemoved: node }\n                        );\n\n                        if (!bindings || !bindingsUpdater.isActive())\n                            bindingsUpdater = null;\n                    }\n\n                    var bindingHandlerThatControlsDescendantBindings;\n                    if (bindings) {\n                        // Return the value accessor for a given binding. When bindings are static (won't be updated because of a binding\n                        // context update), just return the value accessor from the binding. Otherwise, return a function that always gets\n                        // the latest binding value and registers a dependency on the binding updater.\n                        var getValueAccessor = bindingsUpdater\n                            ? function(bindingKey) {\n                            return function() {\n                                return evaluateValueAccessor(bindingsUpdater()[bindingKey]);\n                            };\n                        } : function(bindingKey) {\n                            return bindings[bindingKey];\n                        };\n\n                        // Use of allBindings as a function is maintained for backwards compatibility, but its use is deprecated\n                        function allBindings() {\n                            return ko.utils.objectMap(bindingsUpdater ? bindingsUpdater() : bindings, evaluateValueAccessor);\n                        }\n                        // The following is the 3.x allBindings API\n                        allBindings['get'] = function(key) {\n                            return bindings[key] && evaluateValueAccessor(getValueAccessor(key));\n                        };\n                        allBindings['has'] = function(key) {\n                            return key in bindings;\n                        };\n\n                        // First put the bindings into the right order\n                        var orderedBindings = topologicalSortBindings(bindings);\n\n                        // Go through the sorted bindings, calling init and update for each\n                        ko.utils.arrayForEach(orderedBindings, function(bindingKeyAndHandler) {\n                            // Note that topologicalSortBindings has already filtered out any nonexistent binding handlers,\n                            // so bindingKeyAndHandler.handler will always be nonnull.\n                            var handlerInitFn = bindingKeyAndHandler.handler[\"init\"],\n                                handlerUpdateFn = bindingKeyAndHandler.handler[\"update\"],\n                                bindingKey = bindingKeyAndHandler.key;\n\n                            if (node.nodeType === 8) {\n                                validateThatBindingIsAllowedForVirtualElements(bindingKey);\n                            }\n\n                            try {\n                                // Run init, ignoring any dependencies\n                                if (typeof handlerInitFn == \"function\") {\n                                    ko.dependencyDetection.ignore(function() {\n                                        var initResult = handlerInitFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);\n\n                                        // If this binding handler claims to control descendant bindings, make a note of this\n                                        if (initResult && initResult['controlsDescendantBindings']) {\n                                            if (bindingHandlerThatControlsDescendantBindings !== undefined)\n                                                throw new Error(\"Multiple bindings (\" + bindingHandlerThatControlsDescendantBindings + \" and \" + bindingKey + \") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.\");\n                                            bindingHandlerThatControlsDescendantBindings = bindingKey;\n                                        }\n                                    });\n                                }\n\n                                // Run update in its own computed wrapper\n                                if (typeof handlerUpdateFn == \"function\") {\n                                    ko.dependentObservable(\n                                        function() {\n                                            handlerUpdateFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);\n                                        },\n                                        null,\n                                        { disposeWhenNodeIsRemoved: node }\n                                    );\n                                }\n                            } catch (ex) {\n                                ex.message = \"Unable to process binding \\\"\" + bindingKey + \": \" + bindings[bindingKey] + \"\\\"\\nMessage: \" + ex.message;\n                                throw ex;\n                            }\n                        });\n                    }\n\n                    return {\n                        'shouldBindDescendants': bindingHandlerThatControlsDescendantBindings === undefined\n                    };\n                };\n\n                var storedBindingContextDomDataKey = ko.utils.domData.nextKey();\n                ko.storedBindingContextForNode = function (node, bindingContext) {\n                    if (arguments.length == 2) {\n                        ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);\n                        if (bindingContext._subscribable)\n                            bindingContext._subscribable._addNode(node);\n                    } else {\n                        return ko.utils.domData.get(node, storedBindingContextDomDataKey);\n                    }\n                }\n\n                function getBindingContext(viewModelOrBindingContext) {\n                    return viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)\n                        ? viewModelOrBindingContext\n                        : new ko.bindingContext(viewModelOrBindingContext);\n                }\n\n                ko.applyBindingAccessorsToNode = function (node, bindings, viewModelOrBindingContext) {\n                    if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness\n                        ko.virtualElements.normaliseVirtualElementDomStructure(node);\n                    return applyBindingsToNodeInternal(node, bindings, getBindingContext(viewModelOrBindingContext), true);\n                };\n\n                ko.applyBindingsToNode = function (node, bindings, viewModelOrBindingContext) {\n                    var context = getBindingContext(viewModelOrBindingContext);\n                    return ko.applyBindingAccessorsToNode(node, makeBindingAccessors(bindings, context, node), context);\n                };\n\n                ko.applyBindingsToDescendants = function(viewModelOrBindingContext, rootNode) {\n                    if (rootNode.nodeType === 1 || rootNode.nodeType === 8)\n                        applyBindingsToDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);\n                };\n\n                ko.applyBindings = function (viewModelOrBindingContext, rootNode) {\n                    // If jQuery is loaded after Knockout, we won't initially have access to it. So save it here.\n                    if (!jQueryInstance && window['jQuery']) {\n                        jQueryInstance = window['jQuery'];\n                    }\n\n                    if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))\n                        throw new Error(\"ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node\");\n                    rootNode = rootNode || window.document.body; // Make \"rootNode\" parameter optional\n\n                    applyBindingsToNodeAndDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);\n                };\n\n                // Retrieving binding context from arbitrary nodes\n                ko.contextFor = function(node) {\n                    // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)\n                    switch (node.nodeType) {\n                        case 1:\n                        case 8:\n                            var context = ko.storedBindingContextForNode(node);\n                            if (context) return context;\n                            if (node.parentNode) return ko.contextFor(node.parentNode);\n                            break;\n                    }\n                    return undefined;\n                };\n                ko.dataFor = function(node) {\n                    var context = ko.contextFor(node);\n                    return context ? context['$data'] : undefined;\n                };\n\n                ko.exportSymbol('bindingHandlers', ko.bindingHandlers);\n                ko.exportSymbol('applyBindings', ko.applyBindings);\n                ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);\n                ko.exportSymbol('applyBindingAccessorsToNode', ko.applyBindingAccessorsToNode);\n                ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);\n                ko.exportSymbol('contextFor', ko.contextFor);\n                ko.exportSymbol('dataFor', ko.dataFor);\n            })();\n            (function(undefined) {\n                var loadingSubscribablesCache = {}, // Tracks component loads that are currently in flight\n                    loadedDefinitionsCache = {};    // Tracks component loads that have already completed\n\n                ko.components = {\n                    get: function(componentName, callback) {\n                        var cachedDefinition = getObjectOwnProperty(loadedDefinitionsCache, componentName);\n                        if (cachedDefinition) {\n                            // It's already loaded and cached. Reuse the same definition object.\n                            // Note that for API consistency, even cache hits complete asynchronously by default.\n                            // You can bypass this by putting synchronous:true on your component config.\n                            if (cachedDefinition.isSynchronousComponent) {\n                                ko.dependencyDetection.ignore(function() { // See comment in loaderRegistryBehaviors.js for reasoning\n                                    callback(cachedDefinition.definition);\n                                });\n                            } else {\n                                ko.tasks.schedule(function() { callback(cachedDefinition.definition); });\n                            }\n                        } else {\n                            // Join the loading process that is already underway, or start a new one.\n                            loadComponentAndNotify(componentName, callback);\n                        }\n                    },\n\n                    clearCachedDefinition: function(componentName) {\n                        delete loadedDefinitionsCache[componentName];\n                    },\n\n                    _getFirstResultFromLoaders: getFirstResultFromLoaders\n                };\n\n                function getObjectOwnProperty(obj, propName) {\n                    return obj.hasOwnProperty(propName) ? obj[propName] : undefined;\n                }\n\n                function loadComponentAndNotify(componentName, callback) {\n                    var subscribable = getObjectOwnProperty(loadingSubscribablesCache, componentName),\n                        completedAsync;\n                    if (!subscribable) {\n                        // It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache.\n                        subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable();\n                        subscribable.subscribe(callback);\n\n                        beginLoadingComponent(componentName, function(definition, config) {\n                            var isSynchronousComponent = !!(config && config['synchronous']);\n                            loadedDefinitionsCache[componentName] = { definition: definition, isSynchronousComponent: isSynchronousComponent };\n                            delete loadingSubscribablesCache[componentName];\n\n                            // For API consistency, all loads complete asynchronously. However we want to avoid\n                            // adding an extra task schedule if it's unnecessary (i.e., the completion is already\n                            // async).\n                            //\n                            // You can bypass the 'always asynchronous' feature by putting the synchronous:true\n                            // flag on your component configuration when you register it.\n                            if (completedAsync || isSynchronousComponent) {\n                                // Note that notifySubscribers ignores any dependencies read within the callback.\n                                // See comment in loaderRegistryBehaviors.js for reasoning\n                                subscribable['notifySubscribers'](definition);\n                            } else {\n                                ko.tasks.schedule(function() {\n                                    subscribable['notifySubscribers'](definition);\n                                });\n                            }\n                        });\n                        completedAsync = true;\n                    } else {\n                        subscribable.subscribe(callback);\n                    }\n                }\n\n                function beginLoadingComponent(componentName, callback) {\n                    getFirstResultFromLoaders('getConfig', [componentName], function(config) {\n                        if (config) {\n                            // We have a config, so now load its definition\n                            getFirstResultFromLoaders('loadComponent', [componentName, config], function(definition) {\n                                callback(definition, config);\n                            });\n                        } else {\n                            // The component has no config - it's unknown to all the loaders.\n                            // Note that this is not an error (e.g., a module loading error) - that would abort the\n                            // process and this callback would not run. For this callback to run, all loaders must\n                            // have confirmed they don't know about this component.\n                            callback(null, null);\n                        }\n                    });\n                }\n\n                function getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders) {\n                    // On the first call in the stack, start with the full set of loaders\n                    if (!candidateLoaders) {\n                        candidateLoaders = ko.components['loaders'].slice(0); // Use a copy, because we'll be mutating this array\n                    }\n\n                    // Try the next candidate\n                    var currentCandidateLoader = candidateLoaders.shift();\n                    if (currentCandidateLoader) {\n                        var methodInstance = currentCandidateLoader[methodName];\n                        if (methodInstance) {\n                            var wasAborted = false,\n                                synchronousReturnValue = methodInstance.apply(currentCandidateLoader, argsExceptCallback.concat(function(result) {\n                                    if (wasAborted) {\n                                        callback(null);\n                                    } else if (result !== null) {\n                                        // This candidate returned a value. Use it.\n                                        callback(result);\n                                    } else {\n                                        // Try the next candidate\n                                        getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);\n                                    }\n                                }));\n\n                            // Currently, loaders may not return anything synchronously. This leaves open the possibility\n                            // that we'll extend the API to support synchronous return values in the future. It won't be\n                            // a breaking change, because currently no loader is allowed to return anything except undefined.\n                            if (synchronousReturnValue !== undefined) {\n                                wasAborted = true;\n\n                                // Method to suppress exceptions will remain undocumented. This is only to keep\n                                // KO's specs running tidily, since we can observe the loading got aborted without\n                                // having exceptions cluttering up the console too.\n                                if (!currentCandidateLoader['suppressLoaderExceptions']) {\n                                    throw new Error('Component loaders must supply values by invoking the callback, not by returning values synchronously.');\n                                }\n                            }\n                        } else {\n                            // This candidate doesn't have the relevant handler. Synchronously move on to the next one.\n                            getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);\n                        }\n                    } else {\n                        // No candidates returned a value\n                        callback(null);\n                    }\n                }\n\n                // Reference the loaders via string name so it's possible for developers\n                // to replace the whole array by assigning to ko.components.loaders\n                ko.components['loaders'] = [];\n\n                ko.exportSymbol('components', ko.components);\n                ko.exportSymbol('components.get', ko.components.get);\n                ko.exportSymbol('components.clearCachedDefinition', ko.components.clearCachedDefinition);\n            })();\n            (function(undefined) {\n\n                // The default loader is responsible for two things:\n                // 1. Maintaining the default in-memory registry of component configuration objects\n                //    (i.e., the thing you're writing to when you call ko.components.register(someName, ...))\n                // 2. Answering requests for components by fetching configuration objects\n                //    from that default in-memory registry and resolving them into standard\n                //    component definition objects (of the form { createViewModel: ..., template: ... })\n                // Custom loaders may override either of these facilities, i.e.,\n                // 1. To supply configuration objects from some other source (e.g., conventions)\n                // 2. Or, to resolve configuration objects by loading viewmodels/templates via arbitrary logic.\n\n                var defaultConfigRegistry = {};\n\n                ko.components.register = function(componentName, config) {\n                    if (!config) {\n                        throw new Error('Invalid configuration for ' + componentName);\n                    }\n\n                    if (ko.components.isRegistered(componentName)) {\n                        throw new Error('Component ' + componentName + ' is already registered');\n                    }\n\n                    defaultConfigRegistry[componentName] = config;\n                };\n\n                ko.components.isRegistered = function(componentName) {\n                    return defaultConfigRegistry.hasOwnProperty(componentName);\n                };\n\n                ko.components.unregister = function(componentName) {\n                    delete defaultConfigRegistry[componentName];\n                    ko.components.clearCachedDefinition(componentName);\n                };\n\n                ko.components.defaultLoader = {\n                    'getConfig': function(componentName, callback) {\n                        var result = defaultConfigRegistry.hasOwnProperty(componentName)\n                            ? defaultConfigRegistry[componentName]\n                            : null;\n                        callback(result);\n                    },\n\n                    'loadComponent': function(componentName, config, callback) {\n                        var errorCallback = makeErrorCallback(componentName);\n                        possiblyGetConfigFromAmd(errorCallback, config, function(loadedConfig) {\n                            resolveConfig(componentName, errorCallback, loadedConfig, callback);\n                        });\n                    },\n\n                    'loadTemplate': function(componentName, templateConfig, callback) {\n                        resolveTemplate(makeErrorCallback(componentName), templateConfig, callback);\n                    },\n\n                    'loadViewModel': function(componentName, viewModelConfig, callback) {\n                        resolveViewModel(makeErrorCallback(componentName), viewModelConfig, callback);\n                    }\n                };\n\n                var createViewModelKey = 'createViewModel';\n\n                // Takes a config object of the form { template: ..., viewModel: ... }, and asynchronously convert it\n                // into the standard component definition format:\n                //    { template: <ArrayOfDomNodes>, createViewModel: function(params, componentInfo) { ... } }.\n                // Since both template and viewModel may need to be resolved asynchronously, both tasks are performed\n                // in parallel, and the results joined when both are ready. We don't depend on any promises infrastructure,\n                // so this is implemented manually below.\n                function resolveConfig(componentName, errorCallback, config, callback) {\n                    var result = {},\n                        makeCallBackWhenZero = 2,\n                        tryIssueCallback = function() {\n                            if (--makeCallBackWhenZero === 0) {\n                                callback(result);\n                            }\n                        },\n                        templateConfig = config['template'],\n                        viewModelConfig = config['viewModel'];\n\n                    if (templateConfig) {\n                        possiblyGetConfigFromAmd(errorCallback, templateConfig, function(loadedConfig) {\n                            ko.components._getFirstResultFromLoaders('loadTemplate', [componentName, loadedConfig], function(resolvedTemplate) {\n                                result['template'] = resolvedTemplate;\n                                tryIssueCallback();\n                            });\n                        });\n                    } else {\n                        tryIssueCallback();\n                    }\n\n                    if (viewModelConfig) {\n                        possiblyGetConfigFromAmd(errorCallback, viewModelConfig, function(loadedConfig) {\n                            ko.components._getFirstResultFromLoaders('loadViewModel', [componentName, loadedConfig], function(resolvedViewModel) {\n                                result[createViewModelKey] = resolvedViewModel;\n                                tryIssueCallback();\n                            });\n                        });\n                    } else {\n                        tryIssueCallback();\n                    }\n                }\n\n                function resolveTemplate(errorCallback, templateConfig, callback) {\n                    if (typeof templateConfig === 'string') {\n                        // Markup - parse it\n                        callback(ko.utils.parseHtmlFragment(templateConfig));\n                    } else if (templateConfig instanceof Array) {\n                        // Assume already an array of DOM nodes - pass through unchanged\n                        callback(templateConfig);\n                    } else if (isDocumentFragment(templateConfig)) {\n                        // Document fragment - use its child nodes\n                        callback(ko.utils.makeArray(templateConfig.childNodes));\n                    } else if (templateConfig['element']) {\n                        var element = templateConfig['element'];\n                        if (isDomElement(element)) {\n                            // Element instance - copy its child nodes\n                            callback(cloneNodesFromTemplateSourceElement(element));\n                        } else if (typeof element === 'string') {\n                            // Element ID - find it, then copy its child nodes\n                            var elemInstance = document.getElementById(element);\n                            if (elemInstance) {\n                                callback(cloneNodesFromTemplateSourceElement(elemInstance));\n                            } else {\n                                errorCallback('Cannot find element with ID ' + element);\n                            }\n                        } else {\n                            errorCallback('Unknown element type: ' + element);\n                        }\n                    } else {\n                        errorCallback('Unknown template value: ' + templateConfig);\n                    }\n                }\n\n                function resolveViewModel(errorCallback, viewModelConfig, callback) {\n                    if (typeof viewModelConfig === 'function') {\n                        // Constructor - convert to standard factory function format\n                        // By design, this does *not* supply componentInfo to the constructor, as the intent is that\n                        // componentInfo contains non-viewmodel data (e.g., the component's element) that should only\n                        // be used in factory functions, not viewmodel constructors.\n                        callback(function (params /*, componentInfo */) {\n                            return new viewModelConfig(params);\n                        });\n                    } else if (typeof viewModelConfig[createViewModelKey] === 'function') {\n                        // Already a factory function - use it as-is\n                        callback(viewModelConfig[createViewModelKey]);\n                    } else if ('instance' in viewModelConfig) {\n                        // Fixed object instance - promote to createViewModel format for API consistency\n                        var fixedInstance = viewModelConfig['instance'];\n                        callback(function (params, componentInfo) {\n                            return fixedInstance;\n                        });\n                    } else if ('viewModel' in viewModelConfig) {\n                        // Resolved AMD module whose value is of the form { viewModel: ... }\n                        resolveViewModel(errorCallback, viewModelConfig['viewModel'], callback);\n                    } else {\n                        errorCallback('Unknown viewModel value: ' + viewModelConfig);\n                    }\n                }\n\n                function cloneNodesFromTemplateSourceElement(elemInstance) {\n                    switch (ko.utils.tagNameLower(elemInstance)) {\n                        case 'script':\n                            return ko.utils.parseHtmlFragment(elemInstance.text);\n                        case 'textarea':\n                            return ko.utils.parseHtmlFragment(elemInstance.value);\n                        case 'template':\n                            // For browsers with proper <template> element support (i.e., where the .content property\n                            // gives a document fragment), use that document fragment.\n                            if (isDocumentFragment(elemInstance.content)) {\n                                return ko.utils.cloneNodes(elemInstance.content.childNodes);\n                            }\n                    }\n\n                    // Regular elements such as <div>, and <template> elements on old browsers that don't really\n                    // understand <template> and just treat it as a regular container\n                    return ko.utils.cloneNodes(elemInstance.childNodes);\n                }\n\n                function isDomElement(obj) {\n                    if (window['HTMLElement']) {\n                        return obj instanceof HTMLElement;\n                    } else {\n                        return obj && obj.tagName && obj.nodeType === 1;\n                    }\n                }\n\n                function isDocumentFragment(obj) {\n                    if (window['DocumentFragment']) {\n                        return obj instanceof DocumentFragment;\n                    } else {\n                        return obj && obj.nodeType === 11;\n                    }\n                }\n\n                function possiblyGetConfigFromAmd(errorCallback, config, callback) {\n                    if (typeof config['require'] === 'string') {\n                        // The config is the value of an AMD module\n                        if (amdRequire || window['require']) {\n                            (amdRequire || window['require'])([config['require']], callback);\n                        } else {\n                            errorCallback('Uses require, but no AMD loader is present');\n                        }\n                    } else {\n                        callback(config);\n                    }\n                }\n\n                function makeErrorCallback(componentName) {\n                    return function (message) {\n                        throw new Error('Component \\'' + componentName + '\\': ' + message);\n                    };\n                }\n\n                ko.exportSymbol('components.register', ko.components.register);\n                ko.exportSymbol('components.isRegistered', ko.components.isRegistered);\n                ko.exportSymbol('components.unregister', ko.components.unregister);\n\n                // Expose the default loader so that developers can directly ask it for configuration\n                // or to resolve configuration\n                ko.exportSymbol('components.defaultLoader', ko.components.defaultLoader);\n\n                // By default, the default loader is the only registered component loader\n                ko.components['loaders'].push(ko.components.defaultLoader);\n\n                // Privately expose the underlying config registry for use in old-IE shim\n                ko.components._allRegisteredComponents = defaultConfigRegistry;\n            })();\n            (function (undefined) {\n                // Overridable API for determining which component name applies to a given node. By overriding this,\n                // you can for example map specific tagNames to components that are not preregistered.\n                ko.components['getComponentNameForNode'] = function(node) {\n                    var tagNameLower = ko.utils.tagNameLower(node);\n                    if (ko.components.isRegistered(tagNameLower)) {\n                        // Try to determine that this node can be considered a *custom* element; see https://github.com/knockout/knockout/issues/1603\n                        if (tagNameLower.indexOf('-') != -1 || ('' + node) == \"[object HTMLUnknownElement]\" || (ko.utils.ieVersion <= 8 && node.tagName === tagNameLower)) {\n                            return tagNameLower;\n                        }\n                    }\n                };\n\n                ko.components.addBindingsForCustomElement = function(allBindings, node, bindingContext, valueAccessors) {\n                    // Determine if it's really a custom element matching a component\n                    if (node.nodeType === 1) {\n                        var componentName = ko.components['getComponentNameForNode'](node);\n                        if (componentName) {\n                            // It does represent a component, so add a component binding for it\n                            allBindings = allBindings || {};\n\n                            if (allBindings['component']) {\n                                // Avoid silently overwriting some other 'component' binding that may already be on the element\n                                throw new Error('Cannot use the \"component\" binding on a custom element matching a component');\n                            }\n\n                            var componentBindingValue = { 'name': componentName, 'params': getComponentParamsFromCustomElement(node, bindingContext) };\n\n                            allBindings['component'] = valueAccessors\n                                ? function() { return componentBindingValue; }\n                                : componentBindingValue;\n                        }\n                    }\n\n                    return allBindings;\n                }\n\n                var nativeBindingProviderInstance = new ko.bindingProvider();\n\n                function getComponentParamsFromCustomElement(elem, bindingContext) {\n                    var paramsAttribute = elem.getAttribute('params');\n\n                    if (paramsAttribute) {\n                        var params = nativeBindingProviderInstance['parseBindingsString'](paramsAttribute, bindingContext, elem, { 'valueAccessors': true, 'bindingParams': true }),\n                            rawParamComputedValues = ko.utils.objectMap(params, function(paramValue, paramName) {\n                                return ko.computed(paramValue, null, { disposeWhenNodeIsRemoved: elem });\n                            }),\n                            result = ko.utils.objectMap(rawParamComputedValues, function(paramValueComputed, paramName) {\n                                var paramValue = paramValueComputed.peek();\n                                // Does the evaluation of the parameter value unwrap any observables?\n                                if (!paramValueComputed.isActive()) {\n                                    // No it doesn't, so there's no need for any computed wrapper. Just pass through the supplied value directly.\n                                    // Example: \"someVal: firstName, age: 123\" (whether or not firstName is an observable/computed)\n                                    return paramValue;\n                                } else {\n                                    // Yes it does. Supply a computed property that unwraps both the outer (binding expression)\n                                    // level of observability, and any inner (resulting model value) level of observability.\n                                    // This means the component doesn't have to worry about multiple unwrapping. If the value is a\n                                    // writable observable, the computed will also be writable and pass the value on to the observable.\n                                    return ko.computed({\n                                        'read': function() {\n                                            return ko.utils.unwrapObservable(paramValueComputed());\n                                        },\n                                        'write': ko.isWriteableObservable(paramValue) && function(value) {\n                                            paramValueComputed()(value);\n                                        },\n                                        disposeWhenNodeIsRemoved: elem\n                                    });\n                                }\n                            });\n\n                        // Give access to the raw computeds, as long as that wouldn't overwrite any custom param also called '$raw'\n                        // This is in case the developer wants to react to outer (binding) observability separately from inner\n                        // (model value) observability, or in case the model value observable has subobservables.\n                        if (!result.hasOwnProperty('$raw')) {\n                            result['$raw'] = rawParamComputedValues;\n                        }\n\n                        return result;\n                    } else {\n                        // For consistency, absence of a \"params\" attribute is treated the same as the presence of\n                        // any empty one. Otherwise component viewmodels need special code to check whether or not\n                        // 'params' or 'params.$raw' is null/undefined before reading subproperties, which is annoying.\n                        return { '$raw': {} };\n                    }\n                }\n\n                // --------------------------------------------------------------------------------\n                // Compatibility code for older (pre-HTML5) IE browsers\n\n                if (ko.utils.ieVersion < 9) {\n                    // Whenever you preregister a component, enable it as a custom element in the current document\n                    ko.components['register'] = (function(originalFunction) {\n                        return function(componentName) {\n                            document.createElement(componentName); // Allows IE<9 to parse markup containing the custom element\n                            return originalFunction.apply(this, arguments);\n                        }\n                    })(ko.components['register']);\n\n                    // Whenever you create a document fragment, enable all preregistered component names as custom elements\n                    // This is needed to make innerShiv/jQuery HTML parsing correctly handle the custom elements\n                    document.createDocumentFragment = (function(originalFunction) {\n                        return function() {\n                            var newDocFrag = originalFunction(),\n                                allComponents = ko.components._allRegisteredComponents;\n                            for (var componentName in allComponents) {\n                                if (allComponents.hasOwnProperty(componentName)) {\n                                    newDocFrag.createElement(componentName);\n                                }\n                            }\n                            return newDocFrag;\n                        };\n                    })(document.createDocumentFragment);\n                }\n            })();(function(undefined) {\n\n                var componentLoadingOperationUniqueId = 0;\n\n                ko.bindingHandlers['component'] = {\n                    'init': function(element, valueAccessor, ignored1, ignored2, bindingContext) {\n                        var currentViewModel,\n                            currentLoadingOperationId,\n                            disposeAssociatedComponentViewModel = function () {\n                                var currentViewModelDispose = currentViewModel && currentViewModel['dispose'];\n                                if (typeof currentViewModelDispose === 'function') {\n                                    currentViewModelDispose.call(currentViewModel);\n                                }\n                                currentViewModel = null;\n                                // Any in-flight loading operation is no longer relevant, so make sure we ignore its completion\n                                currentLoadingOperationId = null;\n                            },\n                            originalChildNodes = ko.utils.makeArray(ko.virtualElements.childNodes(element));\n\n                        ko.utils.domNodeDisposal.addDisposeCallback(element, disposeAssociatedComponentViewModel);\n\n                        ko.computed(function () {\n                            var value = ko.utils.unwrapObservable(valueAccessor()),\n                                componentName, componentParams;\n\n                            if (typeof value === 'string') {\n                                componentName = value;\n                            } else {\n                                componentName = ko.utils.unwrapObservable(value['name']);\n                                componentParams = ko.utils.unwrapObservable(value['params']);\n                            }\n\n                            if (!componentName) {\n                                throw new Error('No component name specified');\n                            }\n\n                            var loadingOperationId = currentLoadingOperationId = ++componentLoadingOperationUniqueId;\n                            ko.components.get(componentName, function(componentDefinition) {\n                                // If this is not the current load operation for this element, ignore it.\n                                if (currentLoadingOperationId !== loadingOperationId) {\n                                    return;\n                                }\n\n                                // Clean up previous state\n                                disposeAssociatedComponentViewModel();\n\n                                // Instantiate and bind new component. Implicitly this cleans any old DOM nodes.\n                                if (!componentDefinition) {\n                                    throw new Error('Unknown component \\'' + componentName + '\\'');\n                                }\n                                cloneTemplateIntoElement(componentName, componentDefinition, element);\n                                var componentViewModel = createViewModel(componentDefinition, element, originalChildNodes, componentParams),\n                                    childBindingContext = bindingContext['createChildContext'](componentViewModel, /* dataItemAlias */ undefined, function(ctx) {\n                                        ctx['$component'] = componentViewModel;\n                                        ctx['$componentTemplateNodes'] = originalChildNodes;\n                                    });\n                                currentViewModel = componentViewModel;\n                                ko.applyBindingsToDescendants(childBindingContext, element);\n                            });\n                        }, null, { disposeWhenNodeIsRemoved: element });\n\n                        return { 'controlsDescendantBindings': true };\n                    }\n                };\n\n                ko.virtualElements.allowedBindings['component'] = true;\n\n                function cloneTemplateIntoElement(componentName, componentDefinition, element) {\n                    var template = componentDefinition['template'];\n                    if (!template) {\n                        throw new Error('Component \\'' + componentName + '\\' has no template');\n                    }\n\n                    var clonedNodesArray = ko.utils.cloneNodes(template);\n                    ko.virtualElements.setDomNodeChildren(element, clonedNodesArray);\n                }\n\n                function createViewModel(componentDefinition, element, originalChildNodes, componentParams) {\n                    var componentViewModelFactory = componentDefinition['createViewModel'];\n                    return componentViewModelFactory\n                        ? componentViewModelFactory.call(componentDefinition, componentParams, { 'element': element, 'templateNodes': originalChildNodes })\n                        : componentParams; // Template-only component\n                }\n\n            })();\n            var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };\n            ko.bindingHandlers['attr'] = {\n                'update': function(element, valueAccessor, allBindings) {\n                    var value = ko.utils.unwrapObservable(valueAccessor()) || {};\n                    ko.utils.objectForEach(value, function(attrName, attrValue) {\n                        attrValue = ko.utils.unwrapObservable(attrValue);\n\n                        // To cover cases like \"attr: { checked:someProp }\", we want to remove the attribute entirely\n                        // when someProp is a \"no value\"-like value (strictly null, false, or undefined)\n                        // (because the absence of the \"checked\" attr is how to mark an element as not checked, etc.)\n                        var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);\n                        if (toRemove)\n                            element.removeAttribute(attrName);\n\n                        // In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the\n                        // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,\n                        // but instead of figuring out the mode, we'll just set the attribute through the Javascript\n                        // property for IE <= 8.\n                        if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {\n                            attrName = attrHtmlToJavascriptMap[attrName];\n                            if (toRemove)\n                                element.removeAttribute(attrName);\n                            else\n                                element[attrName] = attrValue;\n                        } else if (!toRemove) {\n                            element.setAttribute(attrName, attrValue.toString());\n                        }\n\n                        // Treat \"name\" specially - although you can think of it as an attribute, it also needs\n                        // special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)\n                        // Deliberately being case-sensitive here because XHTML would regard \"Name\" as a different thing\n                        // entirely, and there's no strong reason to allow for such casing in HTML.\n                        if (attrName === \"name\") {\n                            ko.utils.setElementName(element, toRemove ? \"\" : attrValue.toString());\n                        }\n                    });\n                }\n            };\n            (function() {\n\n                ko.bindingHandlers['checked'] = {\n                    'after': ['value', 'attr'],\n                    'init': function (element, valueAccessor, allBindings) {\n                        var checkedValue = ko.pureComputed(function() {\n                            // Treat \"value\" like \"checkedValue\" when it is included with \"checked\" binding\n                            if (allBindings['has']('checkedValue')) {\n                                return ko.utils.unwrapObservable(allBindings.get('checkedValue'));\n                            } else if (allBindings['has']('value')) {\n                                return ko.utils.unwrapObservable(allBindings.get('value'));\n                            }\n\n                            return element.value;\n                        });\n\n                        function updateModel() {\n                            // This updates the model value from the view value.\n                            // It runs in response to DOM events (click) and changes in checkedValue.\n                            var isChecked = element.checked,\n                                elemValue = useCheckedValue ? checkedValue() : isChecked;\n\n                            // When we're first setting up this computed, don't change any model state.\n                            if (ko.computedContext.isInitial()) {\n                                return;\n                            }\n\n                            // We can ignore unchecked radio buttons, because some other radio\n                            // button will be getting checked, and that one can take care of updating state.\n                            if (isRadio && !isChecked) {\n                                return;\n                            }\n\n                            var modelValue = ko.dependencyDetection.ignore(valueAccessor);\n                            if (valueIsArray) {\n                                var writableValue = rawValueIsNonArrayObservable ? modelValue.peek() : modelValue;\n                                if (oldElemValue !== elemValue) {\n                                    // When we're responding to the checkedValue changing, and the element is\n                                    // currently checked, replace the old elem value with the new elem value\n                                    // in the model array.\n                                    if (isChecked) {\n                                        ko.utils.addOrRemoveItem(writableValue, elemValue, true);\n                                        ko.utils.addOrRemoveItem(writableValue, oldElemValue, false);\n                                    }\n\n                                    oldElemValue = elemValue;\n                                } else {\n                                    // When we're responding to the user having checked/unchecked a checkbox,\n                                    // add/remove the element value to the model array.\n                                    ko.utils.addOrRemoveItem(writableValue, elemValue, isChecked);\n                                }\n                                if (rawValueIsNonArrayObservable && ko.isWriteableObservable(modelValue)) {\n                                    modelValue(writableValue);\n                                }\n                            } else {\n                                ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'checked', elemValue, true);\n                            }\n                        };\n\n                        function updateView() {\n                            // This updates the view value from the model value.\n                            // It runs in response to changes in the bound (checked) value.\n                            var modelValue = ko.utils.unwrapObservable(valueAccessor());\n\n                            if (valueIsArray) {\n                                // When a checkbox is bound to an array, being checked represents its value being present in that array\n                                element.checked = ko.utils.arrayIndexOf(modelValue, checkedValue()) >= 0;\n                            } else if (isCheckbox) {\n                                // When a checkbox is bound to any other value (not an array), being checked represents the value being trueish\n                                element.checked = modelValue;\n                            } else {\n                                // For radio buttons, being checked means that the radio button's value corresponds to the model value\n                                element.checked = (checkedValue() === modelValue);\n                            }\n                        };\n\n                        var isCheckbox = element.type == \"checkbox\",\n                            isRadio = element.type == \"radio\";\n\n                        // Only bind to check boxes and radio buttons\n                        if (!isCheckbox && !isRadio) {\n                            return;\n                        }\n\n                        var rawValue = valueAccessor(),\n                            valueIsArray = isCheckbox && (ko.utils.unwrapObservable(rawValue) instanceof Array),\n                            rawValueIsNonArrayObservable = !(valueIsArray && rawValue.push && rawValue.splice),\n                            oldElemValue = valueIsArray ? checkedValue() : undefined,\n                            useCheckedValue = isRadio || valueIsArray;\n\n                        // IE 6 won't allow radio buttons to be selected unless they have a name\n                        if (isRadio && !element.name)\n                            ko.bindingHandlers['uniqueName']['init'](element, function() { return true });\n\n                        // Set up two computeds to update the binding:\n\n                        // The first responds to changes in the checkedValue value and to element clicks\n                        ko.computed(updateModel, null, { disposeWhenNodeIsRemoved: element });\n                        ko.utils.registerEventHandler(element, \"click\", updateModel);\n\n                        // The second responds to changes in the model value (the one associated with the checked binding)\n                        ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });\n\n                        rawValue = undefined;\n                    }\n                };\n                ko.expressionRewriting.twoWayBindings['checked'] = true;\n\n                ko.bindingHandlers['checkedValue'] = {\n                    'update': function (element, valueAccessor) {\n                        element.value = ko.utils.unwrapObservable(valueAccessor());\n                    }\n                };\n\n            })();var classesWrittenByBindingKey = '__ko__cssValue';\n            ko.bindingHandlers['css'] = {\n                'update': function (element, valueAccessor) {\n                    var value = ko.utils.unwrapObservable(valueAccessor());\n                    if (value !== null && typeof value == \"object\") {\n                        ko.utils.objectForEach(value, function(className, shouldHaveClass) {\n                            shouldHaveClass = ko.utils.unwrapObservable(shouldHaveClass);\n                            ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);\n                        });\n                    } else {\n                        value = ko.utils.stringTrim(String(value || '')); // Make sure we don't try to store or set a non-string value\n                        ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);\n                        element[classesWrittenByBindingKey] = value;\n                        ko.utils.toggleDomNodeCssClass(element, value, true);\n                    }\n                }\n            };\n            ko.bindingHandlers['enable'] = {\n                'update': function (element, valueAccessor) {\n                    var value = ko.utils.unwrapObservable(valueAccessor());\n                    if (value && element.disabled)\n                        element.removeAttribute(\"disabled\");\n                    else if ((!value) && (!element.disabled))\n                        element.disabled = true;\n                }\n            };\n\n            ko.bindingHandlers['disable'] = {\n                'update': function (element, valueAccessor) {\n                    ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });\n                }\n            };\n// For certain common events (currently just 'click'), allow a simplified data-binding syntax\n// e.g. click:handler instead of the usual full-length event:{click:handler}\n            function makeEventHandlerShortcut(eventName) {\n                ko.bindingHandlers[eventName] = {\n                    'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {\n                        var newValueAccessor = function () {\n                            var result = {};\n                            result[eventName] = valueAccessor();\n                            return result;\n                        };\n                        return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindings, viewModel, bindingContext);\n                    }\n                }\n            }\n\n            ko.bindingHandlers['event'] = {\n                'init' : function (element, valueAccessor, allBindings, viewModel, bindingContext) {\n                    var eventsToHandle = valueAccessor() || {};\n                    ko.utils.objectForEach(eventsToHandle, function(eventName) {\n                        if (typeof eventName == \"string\") {\n                            ko.utils.registerEventHandler(element, eventName, function (event) {\n                                var handlerReturnValue;\n                                var handlerFunction = valueAccessor()[eventName];\n                                if (!handlerFunction)\n                                    return;\n\n                                try {\n                                    // Take all the event args, and prefix with the viewmodel\n                                    var argsForHandler = ko.utils.makeArray(arguments);\n                                    viewModel = bindingContext['$data'];\n                                    argsForHandler.unshift(viewModel);\n                                    handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);\n                                } finally {\n                                    if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.\n                                        if (event.preventDefault)\n                                            event.preventDefault();\n                                        else\n                                            event.returnValue = false;\n                                    }\n                                }\n\n                                var bubble = allBindings.get(eventName + 'Bubble') !== false;\n                                if (!bubble) {\n                                    event.cancelBubble = true;\n                                    if (event.stopPropagation)\n                                        event.stopPropagation();\n                                }\n                            });\n                        }\n                    });\n                }\n            };\n// \"foreach: someExpression\" is equivalent to \"template: { foreach: someExpression }\"\n// \"foreach: { data: someExpression, afterAdd: myfn }\" is equivalent to \"template: { foreach: someExpression, afterAdd: myfn }\"\n            ko.bindingHandlers['foreach'] = {\n                makeTemplateValueAccessor: function(valueAccessor) {\n                    return function() {\n                        var modelValue = valueAccessor(),\n                            unwrappedValue = ko.utils.peekObservable(modelValue);    // Unwrap without setting a dependency here\n\n                        // If unwrappedValue is the array, pass in the wrapped value on its own\n                        // The value will be unwrapped and tracked within the template binding\n                        // (See https://github.com/SteveSanderson/knockout/issues/523)\n                        if ((!unwrappedValue) || typeof unwrappedValue.length == \"number\")\n                            return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };\n\n                        // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates\n                        ko.utils.unwrapObservable(modelValue);\n                        return {\n                            'foreach': unwrappedValue['data'],\n                            'as': unwrappedValue['as'],\n                            'includeDestroyed': unwrappedValue['includeDestroyed'],\n                            'afterAdd': unwrappedValue['afterAdd'],\n                            'beforeRemove': unwrappedValue['beforeRemove'],\n                            'afterRender': unwrappedValue['afterRender'],\n                            'beforeMove': unwrappedValue['beforeMove'],\n                            'afterMove': unwrappedValue['afterMove'],\n                            'templateEngine': ko.nativeTemplateEngine.instance\n                        };\n                    };\n                },\n                'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {\n                    return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));\n                },\n                'update': function(element, valueAccessor, allBindings, viewModel, bindingContext) {\n                    return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindings, viewModel, bindingContext);\n                }\n            };\n            ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings\n            ko.virtualElements.allowedBindings['foreach'] = true;\n            var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';\n            var hasfocusLastValue = '__ko_hasfocusLastValue';\n            ko.bindingHandlers['hasfocus'] = {\n                'init': function(element, valueAccessor, allBindings) {\n                    var handleElementFocusChange = function(isFocused) {\n                        // Where possible, ignore which event was raised and determine focus state using activeElement,\n                        // as this avoids phantom focus/blur events raised when changing tabs in modern browsers.\n                        // However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,\n                        // prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus\n                        // from calling 'blur()' on the element when it loses focus.\n                        // Discussion at https://github.com/SteveSanderson/knockout/pull/352\n                        element[hasfocusUpdatingProperty] = true;\n                        var ownerDoc = element.ownerDocument;\n                        if (\"activeElement\" in ownerDoc) {\n                            var active;\n                            try {\n                                active = ownerDoc.activeElement;\n                            } catch(e) {\n                                // IE9 throws if you access activeElement during page load (see issue #703)\n                                active = ownerDoc.body;\n                            }\n                            isFocused = (active === element);\n                        }\n                        var modelValue = valueAccessor();\n                        ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'hasfocus', isFocused, true);\n\n                        //cache the latest value, so we can avoid unnecessarily calling focus/blur in the update function\n                        element[hasfocusLastValue] = isFocused;\n                        element[hasfocusUpdatingProperty] = false;\n                    };\n                    var handleElementFocusIn = handleElementFocusChange.bind(null, true);\n                    var handleElementFocusOut = handleElementFocusChange.bind(null, false);\n\n                    ko.utils.registerEventHandler(element, \"focus\", handleElementFocusIn);\n                    ko.utils.registerEventHandler(element, \"focusin\", handleElementFocusIn); // For IE\n                    ko.utils.registerEventHandler(element, \"blur\",  handleElementFocusOut);\n                    ko.utils.registerEventHandler(element, \"focusout\",  handleElementFocusOut); // For IE\n                },\n                'update': function(element, valueAccessor) {\n                    var value = !!ko.utils.unwrapObservable(valueAccessor());\n\n                    if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) {\n                        value ? element.focus() : element.blur();\n\n                        // In IE, the blur method doesn't always cause the element to lose focus (for example, if the window is not in focus).\n                        // Setting focus to the body element does seem to be reliable in IE, but should only be used if we know that the current\n                        // element was focused already.\n                        if (!value && element[hasfocusLastValue]) {\n                            element.ownerDocument.body.focus();\n                        }\n\n                        // For IE, which doesn't reliably fire \"focus\" or \"blur\" events synchronously\n                        ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? \"focusin\" : \"focusout\"]);\n                    }\n                }\n            };\n            ko.expressionRewriting.twoWayBindings['hasfocus'] = true;\n\n            ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make \"hasFocus\" an alias\n            ko.expressionRewriting.twoWayBindings['hasFocus'] = true;\n            ko.bindingHandlers['html'] = {\n                'init': function() {\n                    // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)\n                    return { 'controlsDescendantBindings': true };\n                },\n                'update': function (element, valueAccessor) {\n                    // setHtml will unwrap the value if needed\n                    ko.utils.setHtml(element, valueAccessor());\n                }\n            };\n// Makes a binding like with or if\n            function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {\n                ko.bindingHandlers[bindingKey] = {\n                    'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {\n                        var didDisplayOnLastUpdate,\n                            savedNodes;\n                        ko.computed(function() {\n                            var dataValue = ko.utils.unwrapObservable(valueAccessor()),\n                                shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue\n                                isFirstRender = !savedNodes,\n                                needsRefresh = isFirstRender || isWith || (shouldDisplay !== didDisplayOnLastUpdate);\n\n                            if (needsRefresh) {\n                                // Save a copy of the inner nodes on the initial update, but only if we have dependencies.\n                                if (isFirstRender && ko.computedContext.getDependenciesCount()) {\n                                    savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);\n                                }\n\n                                if (shouldDisplay) {\n                                    if (!isFirstRender) {\n                                        ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(savedNodes));\n                                    }\n                                    ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, dataValue) : bindingContext, element);\n                                } else {\n                                    ko.virtualElements.emptyNode(element);\n                                }\n\n                                didDisplayOnLastUpdate = shouldDisplay;\n                            }\n                        }, null, { disposeWhenNodeIsRemoved: element });\n                        return { 'controlsDescendantBindings': true };\n                    }\n                };\n                ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings\n                ko.virtualElements.allowedBindings[bindingKey] = true;\n            }\n\n// Construct the actual binding handlers\n            makeWithIfBinding('if');\n            makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);\n            makeWithIfBinding('with', true /* isWith */, false /* isNot */,\n                function(bindingContext, dataValue) {\n                    return bindingContext['createChildContext'](dataValue);\n                }\n            );\n            var captionPlaceholder = {};\n            ko.bindingHandlers['options'] = {\n                'init': function(element) {\n                    if (ko.utils.tagNameLower(element) !== \"select\")\n                        throw new Error(\"options binding applies only to SELECT elements\");\n\n                    // Remove all existing <option>s.\n                    while (element.length > 0) {\n                        element.remove(0);\n                    }\n\n                    // Ensures that the binding processor doesn't try to bind the options\n                    return { 'controlsDescendantBindings': true };\n                },\n                'update': function (element, valueAccessor, allBindings) {\n                    function selectedOptions() {\n                        return ko.utils.arrayFilter(element.options, function (node) { return node.selected; });\n                    }\n\n                    var selectWasPreviouslyEmpty = element.length == 0,\n                        multiple = element.multiple,\n                        previousScrollTop = (!selectWasPreviouslyEmpty && multiple) ? element.scrollTop : null,\n                        unwrappedArray = ko.utils.unwrapObservable(valueAccessor()),\n                        valueAllowUnset = allBindings.get('valueAllowUnset') && allBindings['has']('value'),\n                        includeDestroyed = allBindings.get('optionsIncludeDestroyed'),\n                        arrayToDomNodeChildrenOptions = {},\n                        captionValue,\n                        filteredArray,\n                        previousSelectedValues = [];\n\n                    if (!valueAllowUnset) {\n                        if (multiple) {\n                            previousSelectedValues = ko.utils.arrayMap(selectedOptions(), ko.selectExtensions.readValue);\n                        } else if (element.selectedIndex >= 0) {\n                            previousSelectedValues.push(ko.selectExtensions.readValue(element.options[element.selectedIndex]));\n                        }\n                    }\n\n                    if (unwrappedArray) {\n                        if (typeof unwrappedArray.length == \"undefined\") // Coerce single value into array\n                            unwrappedArray = [unwrappedArray];\n\n                        // Filter out any entries marked as destroyed\n                        filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {\n                            return includeDestroyed || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);\n                        });\n\n                        // If caption is included, add it to the array\n                        if (allBindings['has']('optionsCaption')) {\n                            captionValue = ko.utils.unwrapObservable(allBindings.get('optionsCaption'));\n                            // If caption value is null or undefined, don't show a caption\n                            if (captionValue !== null && captionValue !== undefined) {\n                                filteredArray.unshift(captionPlaceholder);\n                            }\n                        }\n                    } else {\n                        // If a falsy value is provided (e.g. null), we'll simply empty the select element\n                    }\n\n                    function applyToObject(object, predicate, defaultValue) {\n                        var predicateType = typeof predicate;\n                        if (predicateType == \"function\")    // Given a function; run it against the data value\n                            return predicate(object);\n                        else if (predicateType == \"string\") // Given a string; treat it as a property name on the data value\n                            return object[predicate];\n                        else                                // Given no optionsText arg; use the data value itself\n                            return defaultValue;\n                    }\n\n                    // The following functions can run at two different times:\n                    // The first is when the whole array is being updated directly from this binding handler.\n                    // The second is when an observable value for a specific array entry is updated.\n                    // oldOptions will be empty in the first case, but will be filled with the previously generated option in the second.\n                    var itemUpdate = false;\n                    function optionForArrayItem(arrayEntry, index, oldOptions) {\n                        if (oldOptions.length) {\n                            previousSelectedValues = !valueAllowUnset && oldOptions[0].selected ? [ ko.selectExtensions.readValue(oldOptions[0]) ] : [];\n                            itemUpdate = true;\n                        }\n                        var option = element.ownerDocument.createElement(\"option\");\n                        if (arrayEntry === captionPlaceholder) {\n                            ko.utils.setTextContent(option, allBindings.get('optionsCaption'));\n                            ko.selectExtensions.writeValue(option, undefined);\n                        } else {\n                            // Apply a value to the option element\n                            var optionValue = applyToObject(arrayEntry, allBindings.get('optionsValue'), arrayEntry);\n                            ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));\n\n                            // Apply some text to the option element\n                            var optionText = applyToObject(arrayEntry, allBindings.get('optionsText'), optionValue);\n                            ko.utils.setTextContent(option, optionText);\n                        }\n                        return [option];\n                    }\n\n                    // By using a beforeRemove callback, we delay the removal until after new items are added. This fixes a selection\n                    // problem in IE<=8 and Firefox. See https://github.com/knockout/knockout/issues/1208\n                    arrayToDomNodeChildrenOptions['beforeRemove'] =\n                        function (option) {\n                            element.removeChild(option);\n                        };\n\n                    function setSelectionCallback(arrayEntry, newOptions) {\n                        if (itemUpdate && valueAllowUnset) {\n                            // The model value is authoritative, so make sure its value is the one selected\n                            // There is no need to use dependencyDetection.ignore since setDomNodeChildrenFromArrayMapping does so already.\n                            ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);\n                        } else if (previousSelectedValues.length) {\n                            // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.\n                            // That's why we first added them without selection. Now it's time to set the selection.\n                            var isSelected = ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[0])) >= 0;\n                            ko.utils.setOptionNodeSelectionState(newOptions[0], isSelected);\n\n                            // If this option was changed from being selected during a single-item update, notify the change\n                            if (itemUpdate && !isSelected) {\n                                ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, \"change\"]);\n                            }\n                        }\n                    }\n\n                    var callback = setSelectionCallback;\n                    if (allBindings['has']('optionsAfterRender') && typeof allBindings.get('optionsAfterRender') == \"function\") {\n                        callback = function(arrayEntry, newOptions) {\n                            setSelectionCallback(arrayEntry, newOptions);\n                            ko.dependencyDetection.ignore(allBindings.get('optionsAfterRender'), null, [newOptions[0], arrayEntry !== captionPlaceholder ? arrayEntry : undefined]);\n                        }\n                    }\n\n                    ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, arrayToDomNodeChildrenOptions, callback);\n\n                    ko.dependencyDetection.ignore(function () {\n                        if (valueAllowUnset) {\n                            // The model value is authoritative, so make sure its value is the one selected\n                            ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);\n                        } else {\n                            // Determine if the selection has changed as a result of updating the options list\n                            var selectionChanged;\n                            if (multiple) {\n                                // For a multiple-select box, compare the new selection count to the previous one\n                                // But if nothing was selected before, the selection can't have changed\n                                selectionChanged = previousSelectedValues.length && selectedOptions().length < previousSelectedValues.length;\n                            } else {\n                                // For a single-select box, compare the current value to the previous value\n                                // But if nothing was selected before or nothing is selected now, just look for a change in selection\n                                selectionChanged = (previousSelectedValues.length && element.selectedIndex >= 0)\n                                    ? (ko.selectExtensions.readValue(element.options[element.selectedIndex]) !== previousSelectedValues[0])\n                                    : (previousSelectedValues.length || element.selectedIndex >= 0);\n                            }\n\n                            // Ensure consistency between model value and selected option.\n                            // If the dropdown was changed so that selection is no longer the same,\n                            // notify the value or selectedOptions binding.\n                            if (selectionChanged) {\n                                ko.utils.triggerEvent(element, \"change\");\n                            }\n                        }\n                    });\n\n                    // Workaround for IE bug\n                    ko.utils.ensureSelectElementIsRenderedCorrectly(element);\n\n                    if (previousScrollTop && Math.abs(previousScrollTop - element.scrollTop) > 20)\n                        element.scrollTop = previousScrollTop;\n                }\n            };\n            ko.bindingHandlers['options'].optionValueDomDataKey = ko.utils.domData.nextKey();\n            ko.bindingHandlers['selectedOptions'] = {\n                'after': ['options', 'foreach'],\n                'init': function (element, valueAccessor, allBindings) {\n                    ko.utils.registerEventHandler(element, \"change\", function () {\n                        var value = valueAccessor(), valueToWrite = [];\n                        ko.utils.arrayForEach(element.getElementsByTagName(\"option\"), function(node) {\n                            if (node.selected)\n                                valueToWrite.push(ko.selectExtensions.readValue(node));\n                        });\n                        ko.expressionRewriting.writeValueToProperty(value, allBindings, 'selectedOptions', valueToWrite);\n                    });\n                },\n                'update': function (element, valueAccessor) {\n                    if (ko.utils.tagNameLower(element) != \"select\")\n                        throw new Error(\"values binding applies only to SELECT elements\");\n\n                    var newValue = ko.utils.unwrapObservable(valueAccessor()),\n                        previousScrollTop = element.scrollTop;\n\n                    if (newValue && typeof newValue.length == \"number\") {\n                        ko.utils.arrayForEach(element.getElementsByTagName(\"option\"), function(node) {\n                            var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;\n                            if (node.selected != isSelected) {      // This check prevents flashing of the select element in IE\n                                ko.utils.setOptionNodeSelectionState(node, isSelected);\n                            }\n                        });\n                    }\n\n                    element.scrollTop = previousScrollTop;\n                }\n            };\n            ko.expressionRewriting.twoWayBindings['selectedOptions'] = true;\n            ko.bindingHandlers['style'] = {\n                'update': function (element, valueAccessor) {\n                    var value = ko.utils.unwrapObservable(valueAccessor() || {});\n                    ko.utils.objectForEach(value, function(styleName, styleValue) {\n                        styleValue = ko.utils.unwrapObservable(styleValue);\n\n                        if (styleValue === null || styleValue === undefined || styleValue === false) {\n                            // Empty string removes the value, whereas null/undefined have no effect\n                            styleValue = \"\";\n                        }\n\n                        element.style[styleName] = styleValue;\n                    });\n                }\n            };\n            ko.bindingHandlers['submit'] = {\n                'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {\n                    if (typeof valueAccessor() != \"function\")\n                        throw new Error(\"The value for a submit binding must be a function\");\n                    ko.utils.registerEventHandler(element, \"submit\", function (event) {\n                        var handlerReturnValue;\n                        var value = valueAccessor();\n                        try { handlerReturnValue = value.call(bindingContext['$data'], element); }\n                        finally {\n                            if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.\n                                if (event.preventDefault)\n                                    event.preventDefault();\n                                else\n                                    event.returnValue = false;\n                            }\n                        }\n                    });\n                }\n            };\n            ko.bindingHandlers['text'] = {\n                'init': function() {\n                    // Prevent binding on the dynamically-injected text node (as developers are unlikely to expect that, and it has security implications).\n                    // It should also make things faster, as we no longer have to consider whether the text node might be bindable.\n                    return { 'controlsDescendantBindings': true };\n                },\n                'update': function (element, valueAccessor) {\n                    ko.utils.setTextContent(element, valueAccessor());\n                }\n            };\n            ko.virtualElements.allowedBindings['text'] = true;\n            (function () {\n\n                if (window && window.navigator) {\n                    var parseVersion = function (matches) {\n                        if (matches) {\n                            return parseFloat(matches[1]);\n                        }\n                    };\n\n                    // Detect various browser versions because some old versions don't fully support the 'input' event\n                    var operaVersion = window.opera && window.opera.version && parseInt(window.opera.version()),\n                        userAgent = window.navigator.userAgent,\n                        safariVersion = parseVersion(userAgent.match(/^(?:(?!chrome).)*version\\/([^ ]*) safari/i)),\n                        firefoxVersion = parseVersion(userAgent.match(/Firefox\\/([^ ]*)/));\n                }\n\n// IE 8 and 9 have bugs that prevent the normal events from firing when the value changes.\n// But it does fire the 'selectionchange' event on many of those, presumably because the\n// cursor is moving and that counts as the selection changing. The 'selectionchange' event is\n// fired at the document level only and doesn't directly indicate which element changed. We\n// set up just one event handler for the document and use 'activeElement' to determine which\n// element was changed.\n                if (ko.utils.ieVersion < 10) {\n                    var selectionChangeRegisteredName = ko.utils.domData.nextKey(),\n                        selectionChangeHandlerName = ko.utils.domData.nextKey();\n                    var selectionChangeHandler = function(event) {\n                        var target = this.activeElement,\n                            handler = target && ko.utils.domData.get(target, selectionChangeHandlerName);\n                        if (handler) {\n                            handler(event);\n                        }\n                    };\n                    var registerForSelectionChangeEvent = function (element, handler) {\n                        var ownerDoc = element.ownerDocument;\n                        if (!ko.utils.domData.get(ownerDoc, selectionChangeRegisteredName)) {\n                            ko.utils.domData.set(ownerDoc, selectionChangeRegisteredName, true);\n                            ko.utils.registerEventHandler(ownerDoc, 'selectionchange', selectionChangeHandler);\n                        }\n                        ko.utils.domData.set(element, selectionChangeHandlerName, handler);\n                    };\n                }\n\n                ko.bindingHandlers['textInput'] = {\n                    'init': function (element, valueAccessor, allBindings) {\n\n                        var previousElementValue = element.value,\n                            timeoutHandle,\n                            elementValueBeforeEvent;\n\n                        var updateModel = function (event) {\n                            clearTimeout(timeoutHandle);\n                            elementValueBeforeEvent = timeoutHandle = undefined;\n\n                            var elementValue = element.value;\n                            if (previousElementValue !== elementValue) {\n                                // Provide a way for tests to know exactly which event was processed\n                                if (DEBUG && event) element['_ko_textInputProcessedEvent'] = event.type;\n                                previousElementValue = elementValue;\n                                ko.expressionRewriting.writeValueToProperty(valueAccessor(), allBindings, 'textInput', elementValue);\n                            }\n                        };\n\n                        var deferUpdateModel = function (event) {\n                            if (!timeoutHandle) {\n                                // The elementValueBeforeEvent variable is set *only* during the brief gap between an\n                                // event firing and the updateModel function running. This allows us to ignore model\n                                // updates that are from the previous state of the element, usually due to techniques\n                                // such as rateLimit. Such updates, if not ignored, can cause keystrokes to be lost.\n                                elementValueBeforeEvent = element.value;\n                                var handler = DEBUG ? updateModel.bind(element, {type: event.type}) : updateModel;\n                                timeoutHandle = ko.utils.setTimeout(handler, 4);\n                            }\n                        };\n\n                        // IE9 will mess up the DOM if you handle events synchronously which results in DOM changes (such as other bindings);\n                        // so we'll make sure all updates are asynchronous\n                        var ieUpdateModel = ko.utils.ieVersion == 9 ? deferUpdateModel : updateModel;\n\n                        var updateView = function () {\n                            var modelValue = ko.utils.unwrapObservable(valueAccessor());\n\n                            if (modelValue === null || modelValue === undefined) {\n                                modelValue = '';\n                            }\n\n                            if (elementValueBeforeEvent !== undefined && modelValue === elementValueBeforeEvent) {\n                                ko.utils.setTimeout(updateView, 4);\n                                return;\n                            }\n\n                            // Update the element only if the element and model are different. On some browsers, updating the value\n                            // will move the cursor to the end of the input, which would be bad while the user is typing.\n                            if (element.value !== modelValue) {\n                                previousElementValue = modelValue;  // Make sure we ignore events (propertychange) that result from updating the value\n                                element.value = modelValue;\n                            }\n                        };\n\n                        var onEvent = function (event, handler) {\n                            ko.utils.registerEventHandler(element, event, handler);\n                        };\n\n                        if (DEBUG && ko.bindingHandlers['textInput']['_forceUpdateOn']) {\n                            // Provide a way for tests to specify exactly which events are bound\n                            ko.utils.arrayForEach(ko.bindingHandlers['textInput']['_forceUpdateOn'], function(eventName) {\n                                if (eventName.slice(0,5) == 'after') {\n                                    onEvent(eventName.slice(5), deferUpdateModel);\n                                } else {\n                                    onEvent(eventName, updateModel);\n                                }\n                            });\n                        } else {\n                            if (ko.utils.ieVersion < 10) {\n                                // Internet Explorer <= 8 doesn't support the 'input' event, but does include 'propertychange' that fires whenever\n                                // any property of an element changes. Unlike 'input', it also fires if a property is changed from JavaScript code,\n                                // but that's an acceptable compromise for this binding. IE 9 does support 'input', but since it doesn't fire it\n                                // when using autocomplete, we'll use 'propertychange' for it also.\n                                onEvent('propertychange', function(event) {\n                                    if (event.propertyName === 'value') {\n                                        ieUpdateModel(event);\n                                    }\n                                });\n\n                                if (ko.utils.ieVersion == 8) {\n                                    // IE 8 has a bug where it fails to fire 'propertychange' on the first update following a value change from\n                                    // JavaScript code. It also doesn't fire if you clear the entire value. To fix this, we bind to the following\n                                    // events too.\n                                    onEvent('keyup', updateModel);      // A single keystoke\n                                    onEvent('keydown', updateModel);    // The first character when a key is held down\n                                }\n                                if (ko.utils.ieVersion >= 8) {\n                                    // Internet Explorer 9 doesn't fire the 'input' event when deleting text, including using\n                                    // the backspace, delete, or ctrl-x keys, clicking the 'x' to clear the input, dragging text\n                                    // out of the field, and cutting or deleting text using the context menu. 'selectionchange'\n                                    // can detect all of those except dragging text out of the field, for which we use 'dragend'.\n                                    // These are also needed in IE8 because of the bug described above.\n                                    registerForSelectionChangeEvent(element, ieUpdateModel);  // 'selectionchange' covers cut, paste, drop, delete, etc.\n                                    onEvent('dragend', deferUpdateModel);\n                                }\n                            } else {\n                                // All other supported browsers support the 'input' event, which fires whenever the content of the element is changed\n                                // through the user interface.\n                                onEvent('input', updateModel);\n\n                                if (safariVersion < 5 && ko.utils.tagNameLower(element) === \"textarea\") {\n                                    // Safari <5 doesn't fire the 'input' event for <textarea> elements (it does fire 'textInput'\n                                    // but only when typing). So we'll just catch as much as we can with keydown, cut, and paste.\n                                    onEvent('keydown', deferUpdateModel);\n                                    onEvent('paste', deferUpdateModel);\n                                    onEvent('cut', deferUpdateModel);\n                                } else if (operaVersion < 11) {\n                                    // Opera 10 doesn't always fire the 'input' event for cut, paste, undo & drop operations.\n                                    // We can try to catch some of those using 'keydown'.\n                                    onEvent('keydown', deferUpdateModel);\n                                } else if (firefoxVersion < 4.0) {\n                                    // Firefox <= 3.6 doesn't fire the 'input' event when text is filled in through autocomplete\n                                    onEvent('DOMAutoComplete', updateModel);\n\n                                    // Firefox <=3.5 doesn't fire the 'input' event when text is dropped into the input.\n                                    onEvent('dragdrop', updateModel);       // <3.5\n                                    onEvent('drop', updateModel);           // 3.5\n                                }\n                            }\n                        }\n\n                        // Bind to the change event so that we can catch programmatic updates of the value that fire this event.\n                        onEvent('change', updateModel);\n\n                        ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });\n                    }\n                };\n                ko.expressionRewriting.twoWayBindings['textInput'] = true;\n\n// textinput is an alias for textInput\n                ko.bindingHandlers['textinput'] = {\n                    // preprocess is the only way to set up a full alias\n                    'preprocess': function (value, name, addBinding) {\n                        addBinding('textInput', value);\n                    }\n                };\n\n            })();ko.bindingHandlers['uniqueName'] = {\n                'init': function (element, valueAccessor) {\n                    if (valueAccessor()) {\n                        var name = \"ko_unique_\" + (++ko.bindingHandlers['uniqueName'].currentIndex);\n                        ko.utils.setElementName(element, name);\n                    }\n                }\n            };\n            ko.bindingHandlers['uniqueName'].currentIndex = 0;\n            ko.bindingHandlers['value'] = {\n                'after': ['options', 'foreach'],\n                'init': function (element, valueAccessor, allBindings) {\n                    // If the value binding is placed on a radio/checkbox, then just pass through to checkedValue and quit\n                    if (element.tagName.toLowerCase() == \"input\" && (element.type == \"checkbox\" || element.type == \"radio\")) {\n                        ko.applyBindingAccessorsToNode(element, { 'checkedValue': valueAccessor });\n                        return;\n                    }\n\n                    // Always catch \"change\" event; possibly other events too if asked\n                    var eventsToCatch = [\"change\"];\n                    var requestedEventsToCatch = allBindings.get(\"valueUpdate\");\n                    var propertyChangedFired = false;\n                    var elementValueBeforeEvent = null;\n\n                    if (requestedEventsToCatch) {\n                        if (typeof requestedEventsToCatch == \"string\") // Allow both individual event names, and arrays of event names\n                            requestedEventsToCatch = [requestedEventsToCatch];\n                        ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);\n                        eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);\n                    }\n\n                    var valueUpdateHandler = function() {\n                        elementValueBeforeEvent = null;\n                        propertyChangedFired = false;\n                        var modelValue = valueAccessor();\n                        var elementValue = ko.selectExtensions.readValue(element);\n                        ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'value', elementValue);\n                    }\n\n                    // Workaround for https://github.com/SteveSanderson/knockout/issues/122\n                    // IE doesn't fire \"change\" events on textboxes if the user selects a value from its autocomplete list\n                    var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == \"input\" && element.type == \"text\"\n                        && element.autocomplete != \"off\" && (!element.form || element.form.autocomplete != \"off\");\n                    if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, \"propertychange\") == -1) {\n                        ko.utils.registerEventHandler(element, \"propertychange\", function () { propertyChangedFired = true });\n                        ko.utils.registerEventHandler(element, \"focus\", function () { propertyChangedFired = false });\n                        ko.utils.registerEventHandler(element, \"blur\", function() {\n                            if (propertyChangedFired) {\n                                valueUpdateHandler();\n                            }\n                        });\n                    }\n\n                    ko.utils.arrayForEach(eventsToCatch, function(eventName) {\n                        // The syntax \"after<eventname>\" means \"run the handler asynchronously after the event\"\n                        // This is useful, for example, to catch \"keydown\" events after the browser has updated the control\n                        // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)\n                        var handler = valueUpdateHandler;\n                        if (ko.utils.stringStartsWith(eventName, \"after\")) {\n                            handler = function() {\n                                // The elementValueBeforeEvent variable is non-null *only* during the brief gap between\n                                // a keyX event firing and the valueUpdateHandler running, which is scheduled to happen\n                                // at the earliest asynchronous opportunity. We store this temporary information so that\n                                // if, between keyX and valueUpdateHandler, the underlying model value changes separately,\n                                // we can overwrite that model value change with the value the user just typed. Otherwise,\n                                // techniques like rateLimit can trigger model changes at critical moments that will\n                                // override the user's inputs, causing keystrokes to be lost.\n                                elementValueBeforeEvent = ko.selectExtensions.readValue(element);\n                                ko.utils.setTimeout(valueUpdateHandler, 0);\n                            };\n                            eventName = eventName.substring(\"after\".length);\n                        }\n                        ko.utils.registerEventHandler(element, eventName, handler);\n                    });\n\n                    var updateFromModel = function () {\n                        var newValue = ko.utils.unwrapObservable(valueAccessor());\n                        var elementValue = ko.selectExtensions.readValue(element);\n\n                        if (elementValueBeforeEvent !== null && newValue === elementValueBeforeEvent) {\n                            ko.utils.setTimeout(updateFromModel, 0);\n                            return;\n                        }\n\n                        var valueHasChanged = (newValue !== elementValue);\n\n                        if (valueHasChanged) {\n                            if (ko.utils.tagNameLower(element) === \"select\") {\n                                var allowUnset = allBindings.get('valueAllowUnset');\n                                var applyValueAction = function () {\n                                    ko.selectExtensions.writeValue(element, newValue, allowUnset);\n                                };\n                                applyValueAction();\n\n                                if (!allowUnset && newValue !== ko.selectExtensions.readValue(element)) {\n                                    // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,\n                                    // because you're not allowed to have a model value that disagrees with a visible UI selection.\n                                    ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, \"change\"]);\n                                } else {\n                                    // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread\n                                    // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread\n                                    // to apply the value as well.\n                                    ko.utils.setTimeout(applyValueAction, 0);\n                                }\n                            } else {\n                                ko.selectExtensions.writeValue(element, newValue);\n                            }\n                        }\n                    };\n\n                    ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });\n                },\n                'update': function() {} // Keep for backwards compatibility with code that may have wrapped value binding\n            };\n            ko.expressionRewriting.twoWayBindings['value'] = true;\n            ko.bindingHandlers['visible'] = {\n                'update': function (element, valueAccessor) {\n                    var value = ko.utils.unwrapObservable(valueAccessor());\n                    var isCurrentlyVisible = !(element.style.display == \"none\");\n                    if (value && !isCurrentlyVisible)\n                        element.style.display = \"\";\n                    else if ((!value) && isCurrentlyVisible)\n                        element.style.display = \"none\";\n                }\n            };\n// 'click' is just a shorthand for the usual full-length event:{click:handler}\n            makeEventHandlerShortcut('click');\n// If you want to make a custom template engine,\n//\n// [1] Inherit from this class (like ko.nativeTemplateEngine does)\n// [2] Override 'renderTemplateSource', supplying a function with this signature:\n//\n//        function (templateSource, bindingContext, options) {\n//            // - templateSource.text() is the text of the template you should render\n//            // - bindingContext.$data is the data you should pass into the template\n//            //   - you might also want to make bindingContext.$parent, bindingContext.$parents,\n//            //     and bindingContext.$root available in the template too\n//            // - options gives you access to any other properties set on \"data-bind: { template: options }\"\n//            // - templateDocument is the document object of the template\n//            //\n//            // Return value: an array of DOM nodes\n//        }\n//\n// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:\n//\n//        function (script) {\n//            // Return value: Whatever syntax means \"Evaluate the JavaScript statement 'script' and output the result\"\n//            //               For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'\n//        }\n//\n//     This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.\n//     If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)\n//     and then you don't need to override 'createJavaScriptEvaluatorBlock'.\n\n            ko.templateEngine = function () { };\n\n            ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {\n                throw new Error(\"Override renderTemplateSource\");\n            };\n\n            ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {\n                throw new Error(\"Override createJavaScriptEvaluatorBlock\");\n            };\n\n            ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {\n                // Named template\n                if (typeof template == \"string\") {\n                    templateDocument = templateDocument || document;\n                    var elem = templateDocument.getElementById(template);\n                    if (!elem)\n                        throw new Error(\"Cannot find template with ID \" + template);\n                    return new ko.templateSources.domElement(elem);\n                } else if ((template.nodeType == 1) || (template.nodeType == 8)) {\n                    // Anonymous template\n                    return new ko.templateSources.anonymousTemplate(template);\n                } else\n                    throw new Error(\"Unknown template type: \" + template);\n            };\n\n            ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {\n                var templateSource = this['makeTemplateSource'](template, templateDocument);\n                return this['renderTemplateSource'](templateSource, bindingContext, options, templateDocument);\n            };\n\n            ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {\n                // Skip rewriting if requested\n                if (this['allowTemplateRewriting'] === false)\n                    return true;\n                return this['makeTemplateSource'](template, templateDocument)['data'](\"isRewritten\");\n            };\n\n            ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {\n                var templateSource = this['makeTemplateSource'](template, templateDocument);\n                var rewritten = rewriterCallback(templateSource['text']());\n                templateSource['text'](rewritten);\n                templateSource['data'](\"isRewritten\", true);\n            };\n\n            ko.exportSymbol('templateEngine', ko.templateEngine);\n\n            ko.templateRewriting = (function () {\n                var memoizeDataBindingAttributeSyntaxRegex = /(<([a-z]+\\d*)(?:\\s+(?!data-bind\\s*=\\s*)[a-z0-9\\-]+(?:=(?:\\\"[^\\\"]*\\\"|\\'[^\\']*\\'|[^>]*))?)*\\s+)data-bind\\s*=\\s*([\"'])([\\s\\S]*?)\\3/gi;\n                var memoizeVirtualContainerBindingSyntaxRegex = /<!--\\s*ko\\b\\s*([\\s\\S]*?)\\s*-->/g;\n\n                function validateDataBindValuesForRewriting(keyValueArray) {\n                    var allValidators = ko.expressionRewriting.bindingRewriteValidators;\n                    for (var i = 0; i < keyValueArray.length; i++) {\n                        var key = keyValueArray[i]['key'];\n                        if (allValidators.hasOwnProperty(key)) {\n                            var validator = allValidators[key];\n\n                            if (typeof validator === \"function\") {\n                                var possibleErrorMessage = validator(keyValueArray[i]['value']);\n                                if (possibleErrorMessage)\n                                    throw new Error(possibleErrorMessage);\n                            } else if (!validator) {\n                                throw new Error(\"This template engine does not support the '\" + key + \"' binding within its templates\");\n                            }\n                        }\n                    }\n                }\n\n                function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, nodeName, templateEngine) {\n                    var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);\n                    validateDataBindValuesForRewriting(dataBindKeyValueArray);\n                    var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray, {'valueAccessors':true});\n\n                    // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional\n                    // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this\n                    // extra indirection.\n                    var applyBindingsToNextSiblingScript =\n                        \"ko.__tr_ambtns(function($context,$element){return(function(){return{ \" + rewrittenDataBindAttributeValue + \" } })()},'\" + nodeName.toLowerCase() + \"')\";\n                    return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;\n                }\n\n                return {\n                    ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {\n                        if (!templateEngine['isTemplateRewritten'](template, templateDocument))\n                            templateEngine['rewriteTemplate'](template, function (htmlString) {\n                                return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);\n                            }, templateDocument);\n                    },\n\n                    memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {\n                        return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {\n                            return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[4], /* tagToRetain: */ arguments[1], /* nodeName: */ arguments[2], templateEngine);\n                        }).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {\n                            return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ \"<!-- ko -->\", /* nodeName: */ \"#comment\", templateEngine);\n                        });\n                    },\n\n                    applyMemoizedBindingsToNextSibling: function (bindings, nodeName) {\n                        return ko.memoization.memoize(function (domNode, bindingContext) {\n                            var nodeToBind = domNode.nextSibling;\n                            if (nodeToBind && nodeToBind.nodeName.toLowerCase() === nodeName) {\n                                ko.applyBindingAccessorsToNode(nodeToBind, bindings, bindingContext);\n                            }\n                        });\n                    }\n                }\n            })();\n\n\n// Exported only because it has to be referenced by string lookup from within rewritten template\n            ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);\n            (function() {\n                // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving\n                // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)\n                //\n                // Two are provided by default:\n                //  1. ko.templateSources.domElement       - reads/writes the text content of an arbitrary DOM element\n                //  2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but\n                //                                           without reading/writing the actual element text content, since it will be overwritten\n                //                                           with the rendered template output.\n                // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.\n                // Template sources need to have the following functions:\n                //   text() \t\t\t- returns the template text from your storage location\n                //   text(value)\t\t- writes the supplied template text to your storage location\n                //   data(key)\t\t\t- reads values stored using data(key, value) - see below\n                //   data(key, value)\t- associates \"value\" with this template and the key \"key\". Is used to store information like \"isRewritten\".\n                //\n                // Optionally, template sources can also have the following functions:\n                //   nodes()            - returns a DOM element containing the nodes of this template, where available\n                //   nodes(value)       - writes the given DOM element to your storage location\n                // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()\n                // for improved speed. However, all templateSources must supply text() even if they don't supply nodes().\n                //\n                // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were\n                // using and overriding \"makeTemplateSource\" to return an instance of your custom template source.\n\n                ko.templateSources = {};\n\n                // ---- ko.templateSources.domElement -----\n\n                // template types\n                var templateScript = 1,\n                    templateTextArea = 2,\n                    templateTemplate = 3,\n                    templateElement = 4;\n\n                ko.templateSources.domElement = function(element) {\n                    this.domElement = element;\n\n                    if (element) {\n                        var tagNameLower = ko.utils.tagNameLower(element);\n                        this.templateType =\n                            tagNameLower === \"script\" ? templateScript :\n                                tagNameLower === \"textarea\" ? templateTextArea :\n                                    // For browsers with proper <template> element support, where the .content property gives a document fragment\n                                    tagNameLower == \"template\" && element.content && element.content.nodeType === 11 ? templateTemplate :\n                                        templateElement;\n                    }\n                }\n\n                ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {\n                    var elemContentsProperty = this.templateType === templateScript ? \"text\"\n                        : this.templateType === templateTextArea ? \"value\"\n                        : \"innerHTML\";\n\n                    if (arguments.length == 0) {\n                        return this.domElement[elemContentsProperty];\n                    } else {\n                        var valueToWrite = arguments[0];\n                        if (elemContentsProperty === \"innerHTML\")\n                            ko.utils.setHtml(this.domElement, valueToWrite);\n                        else\n                            this.domElement[elemContentsProperty] = valueToWrite;\n                    }\n                };\n\n                var dataDomDataPrefix = ko.utils.domData.nextKey() + \"_\";\n                ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {\n                    if (arguments.length === 1) {\n                        return ko.utils.domData.get(this.domElement, dataDomDataPrefix + key);\n                    } else {\n                        ko.utils.domData.set(this.domElement, dataDomDataPrefix + key, arguments[1]);\n                    }\n                };\n\n                var templatesDomDataKey = ko.utils.domData.nextKey();\n                function getTemplateDomData(element) {\n                    return ko.utils.domData.get(element, templatesDomDataKey) || {};\n                }\n                function setTemplateDomData(element, data) {\n                    ko.utils.domData.set(element, templatesDomDataKey, data);\n                }\n\n                ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {\n                    var element = this.domElement;\n                    if (arguments.length == 0) {\n                        var templateData = getTemplateDomData(element),\n                            containerData = templateData.containerData;\n                        return containerData || (\n                                this.templateType === templateTemplate ? element.content :\n                                    this.templateType === templateElement ? element :\n                                        undefined);\n                    } else {\n                        var valueToWrite = arguments[0];\n                        setTemplateDomData(element, {containerData: valueToWrite});\n                    }\n                };\n\n                // ---- ko.templateSources.anonymousTemplate -----\n                // Anonymous templates are normally saved/retrieved as DOM nodes through \"nodes\".\n                // For compatibility, you can also read \"text\"; it will be serialized from the nodes on demand.\n                // Writing to \"text\" is still supported, but then the template data will not be available as DOM nodes.\n\n                ko.templateSources.anonymousTemplate = function(element) {\n                    this.domElement = element;\n                }\n                ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();\n                ko.templateSources.anonymousTemplate.prototype.constructor = ko.templateSources.anonymousTemplate;\n                ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {\n                    if (arguments.length == 0) {\n                        var templateData = getTemplateDomData(this.domElement);\n                        if (templateData.textData === undefined && templateData.containerData)\n                            templateData.textData = templateData.containerData.innerHTML;\n                        return templateData.textData;\n                    } else {\n                        var valueToWrite = arguments[0];\n                        setTemplateDomData(this.domElement, {textData: valueToWrite});\n                    }\n                };\n\n                ko.exportSymbol('templateSources', ko.templateSources);\n                ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);\n                ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);\n            })();\n            (function () {\n                var _templateEngine;\n                ko.setTemplateEngine = function (templateEngine) {\n                    if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))\n                        throw new Error(\"templateEngine must inherit from ko.templateEngine\");\n                    _templateEngine = templateEngine;\n                }\n\n                function invokeForEachNodeInContinuousRange(firstNode, lastNode, action) {\n                    var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);\n                    while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {\n                        nextInQueue = ko.virtualElements.nextSibling(node);\n                        action(node, nextInQueue);\n                    }\n                }\n\n                function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {\n                    // To be used on any nodes that have been rendered by a template and have been inserted into some parent element\n                    // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because\n                    // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,\n                    // (1) Does a regular \"applyBindings\" to associate bindingContext with this node and to activate any non-memoized bindings\n                    // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)\n\n                    if (continuousNodeArray.length) {\n                        var firstNode = continuousNodeArray[0],\n                            lastNode = continuousNodeArray[continuousNodeArray.length - 1],\n                            parentNode = firstNode.parentNode,\n                            provider = ko.bindingProvider['instance'],\n                            preprocessNode = provider['preprocessNode'];\n\n                        if (preprocessNode) {\n                            invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node, nextNodeInRange) {\n                                var nodePreviousSibling = node.previousSibling;\n                                var newNodes = preprocessNode.call(provider, node);\n                                if (newNodes) {\n                                    if (node === firstNode)\n                                        firstNode = newNodes[0] || nextNodeInRange;\n                                    if (node === lastNode)\n                                        lastNode = newNodes[newNodes.length - 1] || nodePreviousSibling;\n                                }\n                            });\n\n                            // Because preprocessNode can change the nodes, including the first and last nodes, update continuousNodeArray to match.\n                            // We need the full set, including inner nodes, because the unmemoize step might remove the first node (and so the real\n                            // first node needs to be in the array).\n                            continuousNodeArray.length = 0;\n                            if (!firstNode) { // preprocessNode might have removed all the nodes, in which case there's nothing left to do\n                                return;\n                            }\n                            if (firstNode === lastNode) {\n                                continuousNodeArray.push(firstNode);\n                            } else {\n                                continuousNodeArray.push(firstNode, lastNode);\n                                ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);\n                            }\n                        }\n\n                        // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)\n                        // whereas a regular applyBindings won't introduce new memoized nodes\n                        invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {\n                            if (node.nodeType === 1 || node.nodeType === 8)\n                                ko.applyBindings(bindingContext, node);\n                        });\n                        invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {\n                            if (node.nodeType === 1 || node.nodeType === 8)\n                                ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);\n                        });\n\n                        // Make sure any changes done by applyBindings or unmemoize are reflected in the array\n                        ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);\n                    }\n                }\n\n                function getFirstNodeFromPossibleArray(nodeOrNodeArray) {\n                    return nodeOrNodeArray.nodeType ? nodeOrNodeArray\n                        : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]\n                        : null;\n                }\n\n                function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {\n                    options = options || {};\n                    var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);\n                    var templateDocument = (firstTargetNode || template || {}).ownerDocument;\n                    var templateEngineToUse = (options['templateEngine'] || _templateEngine);\n                    ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);\n                    var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);\n\n                    // Loosely check result is an array of DOM nodes\n                    if ((typeof renderedNodesArray.length != \"number\") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != \"number\"))\n                        throw new Error(\"Template engine must return an array of DOM nodes\");\n\n                    var haveAddedNodesToParent = false;\n                    switch (renderMode) {\n                        case \"replaceChildren\":\n                            ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);\n                            haveAddedNodesToParent = true;\n                            break;\n                        case \"replaceNode\":\n                            ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);\n                            haveAddedNodesToParent = true;\n                            break;\n                        case \"ignoreTargetNode\": break;\n                        default:\n                            throw new Error(\"Unknown renderMode: \" + renderMode);\n                    }\n\n                    if (haveAddedNodesToParent) {\n                        activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);\n                        if (options['afterRender'])\n                            ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]);\n                    }\n\n                    return renderedNodesArray;\n                }\n\n                function resolveTemplateName(template, data, context) {\n                    // The template can be specified as:\n                    if (ko.isObservable(template)) {\n                        // 1. An observable, with string value\n                        return template();\n                    } else if (typeof template === 'function') {\n                        // 2. A function of (data, context) returning a string\n                        return template(data, context);\n                    } else {\n                        // 3. A string\n                        return template;\n                    }\n                }\n\n                ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {\n                    options = options || {};\n                    if ((options['templateEngine'] || _templateEngine) == undefined)\n                        throw new Error(\"Set a template engine before calling renderTemplate\");\n                    renderMode = renderMode || \"replaceChildren\";\n\n                    if (targetNodeOrNodeArray) {\n                        var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);\n\n                        var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)\n                        var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == \"replaceNode\") ? firstTargetNode.parentNode : firstTargetNode;\n\n                        return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes\n                            function () {\n                                // Ensure we've got a proper binding context to work with\n                                var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))\n                                    ? dataOrBindingContext\n                                    : new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));\n\n                                var templateName = resolveTemplateName(template, bindingContext['$data'], bindingContext),\n                                    renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);\n\n                                if (renderMode == \"replaceNode\") {\n                                    targetNodeOrNodeArray = renderedNodesArray;\n                                    firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);\n                                }\n                            },\n                            null,\n                            { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }\n                        );\n                    } else {\n                        // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node\n                        return ko.memoization.memoize(function (domNode) {\n                            ko.renderTemplate(template, dataOrBindingContext, options, domNode, \"replaceNode\");\n                        });\n                    }\n                };\n\n                ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {\n                    // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then\n                    // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.\n                    var arrayItemContext;\n\n                    // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode\n                    var executeTemplateForArrayItem = function (arrayValue, index) {\n                        // Support selecting template as a function of the data being rendered\n                        arrayItemContext = parentBindingContext['createChildContext'](arrayValue, options['as'], function(context) {\n                            context['$index'] = index;\n                        });\n\n                        var templateName = resolveTemplateName(template, arrayValue, arrayItemContext);\n                        return executeTemplate(null, \"ignoreTargetNode\", templateName, arrayItemContext, options);\n                    }\n\n                    // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode\n                    var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {\n                        activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);\n                        if (options['afterRender'])\n                            options['afterRender'](addedNodesArray, arrayValue);\n\n                        // release the \"cache\" variable, so that it can be collected by\n                        // the GC when its value isn't used from within the bindings anymore.\n                        arrayItemContext = null;\n                    };\n\n                    return ko.dependentObservable(function () {\n                        var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];\n                        if (typeof unwrappedArray.length == \"undefined\") // Coerce single value into array\n                            unwrappedArray = [unwrappedArray];\n\n                        // Filter out any entries marked as destroyed\n                        var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {\n                            return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);\n                        });\n\n                        // Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).\n                        // If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.\n                        ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]);\n\n                    }, null, { disposeWhenNodeIsRemoved: targetNode });\n                };\n\n                var templateComputedDomDataKey = ko.utils.domData.nextKey();\n                function disposeOldComputedAndStoreNewOne(element, newComputed) {\n                    var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);\n                    if (oldComputed && (typeof(oldComputed.dispose) == 'function'))\n                        oldComputed.dispose();\n                    ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined);\n                }\n\n                ko.bindingHandlers['template'] = {\n                    'init': function(element, valueAccessor) {\n                        // Support anonymous templates\n                        var bindingValue = ko.utils.unwrapObservable(valueAccessor());\n                        if (typeof bindingValue == \"string\" || bindingValue['name']) {\n                            // It's a named template - clear the element\n                            ko.virtualElements.emptyNode(element);\n                        } else if ('nodes' in bindingValue) {\n                            // We've been given an array of DOM nodes. Save them as the template source.\n                            // There is no known use case for the node array being an observable array (if the output\n                            // varies, put that behavior *into* your template - that's what templates are for), and\n                            // the implementation would be a mess, so assert that it's not observable.\n                            var nodes = bindingValue['nodes'] || [];\n                            if (ko.isObservable(nodes)) {\n                                throw new Error('The \"nodes\" option must be a plain, non-observable array.');\n                            }\n                            var container = ko.utils.moveCleanedNodesToContainerElement(nodes); // This also removes the nodes from their current parent\n                            new ko.templateSources.anonymousTemplate(element)['nodes'](container);\n                        } else {\n                            // It's an anonymous template - store the element contents, then clear the element\n                            var templateNodes = ko.virtualElements.childNodes(element),\n                                container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent\n                            new ko.templateSources.anonymousTemplate(element)['nodes'](container);\n                        }\n                        return { 'controlsDescendantBindings': true };\n                    },\n                    'update': function (element, valueAccessor, allBindings, viewModel, bindingContext) {\n                        var value = valueAccessor(),\n                            dataValue,\n                            options = ko.utils.unwrapObservable(value),\n                            shouldDisplay = true,\n                            templateComputed = null,\n                            templateName;\n\n                        if (typeof options == \"string\") {\n                            templateName = value;\n                            options = {};\n                        } else {\n                            templateName = options['name'];\n\n                            // Support \"if\"/\"ifnot\" conditions\n                            if ('if' in options)\n                                shouldDisplay = ko.utils.unwrapObservable(options['if']);\n                            if (shouldDisplay && 'ifnot' in options)\n                                shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);\n\n                            dataValue = ko.utils.unwrapObservable(options['data']);\n                        }\n\n                        if ('foreach' in options) {\n                            // Render once for each data point (treating data set as empty if shouldDisplay==false)\n                            var dataArray = (shouldDisplay && options['foreach']) || [];\n                            templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext);\n                        } else if (!shouldDisplay) {\n                            ko.virtualElements.emptyNode(element);\n                        } else {\n                            // Render once for this single data point (or use the viewModel if no data was provided)\n                            var innerBindingContext = ('data' in options) ?\n                                bindingContext['createChildContext'](dataValue, options['as']) :  // Given an explitit 'data' value, we create a child binding context for it\n                                bindingContext;                                                        // Given no explicit 'data' value, we retain the same binding context\n                            templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element);\n                        }\n\n                        // It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)\n                        disposeOldComputedAndStoreNewOne(element, templateComputed);\n                    }\n                };\n\n                // Anonymous templates can't be rewritten. Give a nice error message if you try to do it.\n                ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {\n                    var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);\n\n                    if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])\n                        return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)\n\n                    if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, \"name\"))\n                        return null; // Named templates can be rewritten, so return \"no error\"\n                    return \"This template engine does not support anonymous templates nested within its templates\";\n                };\n\n                ko.virtualElements.allowedBindings['template'] = true;\n            })();\n\n            ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);\n            ko.exportSymbol('renderTemplate', ko.renderTemplate);\n// Go through the items that have been added and deleted and try to find matches between them.\n            ko.utils.findMovesInArrayComparison = function (left, right, limitFailedCompares) {\n                if (left.length && right.length) {\n                    var failedCompares, l, r, leftItem, rightItem;\n                    for (failedCompares = l = 0; (!limitFailedCompares || failedCompares < limitFailedCompares) && (leftItem = left[l]); ++l) {\n                        for (r = 0; rightItem = right[r]; ++r) {\n                            if (leftItem['value'] === rightItem['value']) {\n                                leftItem['moved'] = rightItem['index'];\n                                rightItem['moved'] = leftItem['index'];\n                                right.splice(r, 1);         // This item is marked as moved; so remove it from right list\n                                failedCompares = r = 0;     // Reset failed compares count because we're checking for consecutive failures\n                                break;\n                            }\n                        }\n                        failedCompares += r;\n                    }\n                }\n            };\n\n            ko.utils.compareArrays = (function () {\n                var statusNotInOld = 'added', statusNotInNew = 'deleted';\n\n                // Simple calculation based on Levenshtein distance.\n                function compareArrays(oldArray, newArray, options) {\n                    // For backward compatibility, if the third arg is actually a bool, interpret\n                    // it as the old parameter 'dontLimitMoves'. Newer code should use { dontLimitMoves: true }.\n                    options = (typeof options === 'boolean') ? { 'dontLimitMoves': options } : (options || {});\n                    oldArray = oldArray || [];\n                    newArray = newArray || [];\n\n                    if (oldArray.length < newArray.length)\n                        return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, options);\n                    else\n                        return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, options);\n                }\n\n                function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, options) {\n                    var myMin = Math.min,\n                        myMax = Math.max,\n                        editDistanceMatrix = [],\n                        smlIndex, smlIndexMax = smlArray.length,\n                        bigIndex, bigIndexMax = bigArray.length,\n                        compareRange = (bigIndexMax - smlIndexMax) || 1,\n                        maxDistance = smlIndexMax + bigIndexMax + 1,\n                        thisRow, lastRow,\n                        bigIndexMaxForRow, bigIndexMinForRow;\n\n                    for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {\n                        lastRow = thisRow;\n                        editDistanceMatrix.push(thisRow = []);\n                        bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);\n                        bigIndexMinForRow = myMax(0, smlIndex - 1);\n                        for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {\n                            if (!bigIndex)\n                                thisRow[bigIndex] = smlIndex + 1;\n                            else if (!smlIndex)  // Top row - transform empty array into new array via additions\n                                thisRow[bigIndex] = bigIndex + 1;\n                            else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])\n                                thisRow[bigIndex] = lastRow[bigIndex - 1];                  // copy value (no edit)\n                            else {\n                                var northDistance = lastRow[bigIndex] || maxDistance;       // not in big (deletion)\n                                var westDistance = thisRow[bigIndex - 1] || maxDistance;    // not in small (addition)\n                                thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;\n                            }\n                        }\n                    }\n\n                    var editScript = [], meMinusOne, notInSml = [], notInBig = [];\n                    for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {\n                        meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;\n                        if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) {\n                            notInSml.push(editScript[editScript.length] = {     // added\n                                'status': statusNotInSml,\n                                'value': bigArray[--bigIndex],\n                                'index': bigIndex });\n                        } else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {\n                            notInBig.push(editScript[editScript.length] = {     // deleted\n                                'status': statusNotInBig,\n                                'value': smlArray[--smlIndex],\n                                'index': smlIndex });\n                        } else {\n                            --bigIndex;\n                            --smlIndex;\n                            if (!options['sparse']) {\n                                editScript.push({\n                                    'status': \"retained\",\n                                    'value': bigArray[bigIndex] });\n                            }\n                        }\n                    }\n\n                    // Set a limit on the number of consecutive non-matching comparisons; having it a multiple of\n                    // smlIndexMax keeps the time complexity of this algorithm linear.\n                    ko.utils.findMovesInArrayComparison(notInBig, notInSml, !options['dontLimitMoves'] && smlIndexMax * 10);\n\n                    return editScript.reverse();\n                }\n\n                return compareArrays;\n            })();\n\n            ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);\n            (function () {\n                // Objective:\n                // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,\n                //   map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node\n                // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node\n                //   so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we\n                //   previously mapped - retain those nodes, and just insert/delete other ones\n\n                // \"callbackAfterAddingNodes\" will be invoked after any \"mapping\"-generated nodes are inserted into the container node\n                // You can use this, for example, to activate bindings on those nodes.\n\n                function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {\n                    // Map this array value inside a dependentObservable so we re-map when any dependency changes\n                    var mappedNodes = [];\n                    var dependentObservable = ko.dependentObservable(function() {\n                        var newMappedNodes = mapping(valueToMap, index, ko.utils.fixUpContinuousNodeArray(mappedNodes, containerNode)) || [];\n\n                        // On subsequent evaluations, just replace the previously-inserted DOM nodes\n                        if (mappedNodes.length > 0) {\n                            ko.utils.replaceDomNodes(mappedNodes, newMappedNodes);\n                            if (callbackAfterAddingNodes)\n                                ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);\n                        }\n\n                        // Replace the contents of the mappedNodes array, thereby updating the record\n                        // of which nodes would be deleted if valueToMap was itself later removed\n                        mappedNodes.length = 0;\n                        ko.utils.arrayPushAll(mappedNodes, newMappedNodes);\n                    }, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return !ko.utils.anyDomNodeIsAttachedToDocument(mappedNodes); } });\n                    return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) };\n                }\n\n                var lastMappingResultDomDataKey = ko.utils.domData.nextKey(),\n                    deletedItemDummyValue = ko.utils.domData.nextKey();\n\n                ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {\n                    // Compare the provided array against the previous one\n                    array = array || [];\n                    options = options || {};\n                    var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;\n                    var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];\n                    var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });\n                    var editScript = ko.utils.compareArrays(lastArray, array, options['dontLimitMoves']);\n\n                    // Build the new mapping result\n                    var newMappingResult = [];\n                    var lastMappingResultIndex = 0;\n                    var newMappingResultIndex = 0;\n\n                    var nodesToDelete = [];\n                    var itemsToProcess = [];\n                    var itemsForBeforeRemoveCallbacks = [];\n                    var itemsForMoveCallbacks = [];\n                    var itemsForAfterAddCallbacks = [];\n                    var mapData;\n\n                    function itemMovedOrRetained(editScriptIndex, oldPosition) {\n                        mapData = lastMappingResult[oldPosition];\n                        if (newMappingResultIndex !== oldPosition)\n                            itemsForMoveCallbacks[editScriptIndex] = mapData;\n                        // Since updating the index might change the nodes, do so before calling fixUpContinuousNodeArray\n                        mapData.indexObservable(newMappingResultIndex++);\n                        ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode);\n                        newMappingResult.push(mapData);\n                        itemsToProcess.push(mapData);\n                    }\n\n                    function callCallback(callback, items) {\n                        if (callback) {\n                            for (var i = 0, n = items.length; i < n; i++) {\n                                if (items[i]) {\n                                    ko.utils.arrayForEach(items[i].mappedNodes, function(node) {\n                                        callback(node, i, items[i].arrayEntry);\n                                    });\n                                }\n                            }\n                        }\n                    }\n\n                    for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) {\n                        movedIndex = editScriptItem['moved'];\n                        switch (editScriptItem['status']) {\n                            case \"deleted\":\n                                if (movedIndex === undefined) {\n                                    mapData = lastMappingResult[lastMappingResultIndex];\n\n                                    // Stop tracking changes to the mapping for these nodes\n                                    if (mapData.dependentObservable) {\n                                        mapData.dependentObservable.dispose();\n                                        mapData.dependentObservable = undefined;\n                                    }\n\n                                    // Queue these nodes for later removal\n                                    if (ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode).length) {\n                                        if (options['beforeRemove']) {\n                                            newMappingResult.push(mapData);\n                                            itemsToProcess.push(mapData);\n                                            if (mapData.arrayEntry === deletedItemDummyValue) {\n                                                mapData = null;\n                                            } else {\n                                                itemsForBeforeRemoveCallbacks[i] = mapData;\n                                            }\n                                        }\n                                        if (mapData) {\n                                            nodesToDelete.push.apply(nodesToDelete, mapData.mappedNodes);\n                                        }\n                                    }\n                                }\n                                lastMappingResultIndex++;\n                                break;\n\n                            case \"retained\":\n                                itemMovedOrRetained(i, lastMappingResultIndex++);\n                                break;\n\n                            case \"added\":\n                                if (movedIndex !== undefined) {\n                                    itemMovedOrRetained(i, movedIndex);\n                                } else {\n                                    mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) };\n                                    newMappingResult.push(mapData);\n                                    itemsToProcess.push(mapData);\n                                    if (!isFirstExecution)\n                                        itemsForAfterAddCallbacks[i] = mapData;\n                                }\n                                break;\n                        }\n                    }\n\n                    // Store a copy of the array items we just considered so we can difference it next time\n                    ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);\n\n                    // Call beforeMove first before any changes have been made to the DOM\n                    callCallback(options['beforeMove'], itemsForMoveCallbacks);\n\n                    // Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)\n                    ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);\n\n                    // Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)\n                    for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) {\n                        // Get nodes for newly added items\n                        if (!mapData.mappedNodes)\n                            ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));\n\n                        // Put nodes in the right place if they aren't there already\n                        for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) {\n                            if (node !== nextNode)\n                                ko.virtualElements.insertAfter(domNode, node, lastNode);\n                        }\n\n                        // Run the callbacks for newly added nodes (for example, to apply bindings, etc.)\n                        if (!mapData.initialized && callbackAfterAddingNodes) {\n                            callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);\n                            mapData.initialized = true;\n                        }\n                    }\n\n                    // If there's a beforeRemove callback, call it after reordering.\n                    // Note that we assume that the beforeRemove callback will usually be used to remove the nodes using\n                    // some sort of animation, which is why we first reorder the nodes that will be removed. If the\n                    // callback instead removes the nodes right away, it would be more efficient to skip reordering them.\n                    // Perhaps we'll make that change in the future if this scenario becomes more common.\n                    callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);\n\n                    // Replace the stored values of deleted items with a dummy value. This provides two benefits: it marks this item\n                    // as already \"removed\" so we won't call beforeRemove for it again, and it ensures that the item won't match up\n                    // with an actual item in the array and appear as \"retained\" or \"moved\".\n                    for (i = 0; i < itemsForBeforeRemoveCallbacks.length; ++i) {\n                        if (itemsForBeforeRemoveCallbacks[i]) {\n                            itemsForBeforeRemoveCallbacks[i].arrayEntry = deletedItemDummyValue;\n                        }\n                    }\n\n                    // Finally call afterMove and afterAdd callbacks\n                    callCallback(options['afterMove'], itemsForMoveCallbacks);\n                    callCallback(options['afterAdd'], itemsForAfterAddCallbacks);\n                }\n            })();\n\n            ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);\n            ko.nativeTemplateEngine = function () {\n                this['allowTemplateRewriting'] = false;\n            }\n\n            ko.nativeTemplateEngine.prototype = new ko.templateEngine();\n            ko.nativeTemplateEngine.prototype.constructor = ko.nativeTemplateEngine;\n            ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {\n                var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly\n                    templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,\n                    templateNodes = templateNodesFunc ? templateSource['nodes']() : null;\n\n                if (templateNodes) {\n                    return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);\n                } else {\n                    var templateText = templateSource['text']();\n                    return ko.utils.parseHtmlFragment(templateText, templateDocument);\n                }\n            };\n\n            ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();\n            ko.setTemplateEngine(ko.nativeTemplateEngine.instance);\n\n            ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);\n            (function() {\n                ko.jqueryTmplTemplateEngine = function () {\n                    // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl\n                    // doesn't expose a version number, so we have to infer it.\n                    // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,\n                    // which KO internally refers to as version \"2\", so older versions are no longer detected.\n                    var jQueryTmplVersion = this.jQueryTmplVersion = (function() {\n                        if (!jQueryInstance || !(jQueryInstance['tmpl']))\n                            return 0;\n                        // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.\n                        try {\n                            if (jQueryInstance['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {\n                                // Since 1.0.0pre, custom tags should append markup to an array called \"__\"\n                                return 2; // Final version of jquery.tmpl\n                            }\n                        } catch(ex) { /* Apparently not the version we were looking for */ }\n\n                        return 1; // Any older version that we don't support\n                    })();\n\n                    function ensureHasReferencedJQueryTemplates() {\n                        if (jQueryTmplVersion < 2)\n                            throw new Error(\"Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.\");\n                    }\n\n                    function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {\n                        return jQueryInstance['tmpl'](compiledTemplate, data, jQueryTemplateOptions);\n                    }\n\n                    this['renderTemplateSource'] = function(templateSource, bindingContext, options, templateDocument) {\n                        templateDocument = templateDocument || document;\n                        options = options || {};\n                        ensureHasReferencedJQueryTemplates();\n\n                        // Ensure we have stored a precompiled version of this template (don't want to reparse on every render)\n                        var precompiled = templateSource['data']('precompiled');\n                        if (!precompiled) {\n                            var templateText = templateSource['text']() || \"\";\n                            // Wrap in \"with($whatever.koBindingContext) { ... }\"\n                            templateText = \"{{ko_with $item.koBindingContext}}\" + templateText + \"{{/ko_with}}\";\n\n                            precompiled = jQueryInstance['template'](null, templateText);\n                            templateSource['data']('precompiled', precompiled);\n                        }\n\n                        var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays\n                        var jQueryTemplateOptions = jQueryInstance['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);\n\n                        var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);\n                        resultNodes['appendTo'](templateDocument.createElement(\"div\")); // Using \"appendTo\" forces jQuery/jQuery.tmpl to perform necessary cleanup work\n\n                        jQueryInstance['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders\n                        return resultNodes;\n                    };\n\n                    this['createJavaScriptEvaluatorBlock'] = function(script) {\n                        return \"{{ko_code ((function() { return \" + script + \" })()) }}\";\n                    };\n\n                    this['addTemplate'] = function(templateName, templateMarkup) {\n                        document.write(\"<script type='text/html' id='\" + templateName + \"'>\" + templateMarkup + \"<\" + \"/script>\");\n                    };\n\n                    if (jQueryTmplVersion > 0) {\n                        jQueryInstance['tmpl']['tag']['ko_code'] = {\n                            open: \"__.push($1 || '');\"\n                        };\n                        jQueryInstance['tmpl']['tag']['ko_with'] = {\n                            open: \"with($1) {\",\n                            close: \"} \"\n                        };\n                    }\n                };\n\n                ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();\n                ko.jqueryTmplTemplateEngine.prototype.constructor = ko.jqueryTmplTemplateEngine;\n\n                // Use this one by default *only if jquery.tmpl is referenced*\n                var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();\n                if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)\n                    ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);\n\n                ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);\n            })();\n        }));\n    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