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July 17, 2014 17:58
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Selectize with KnockoutJS
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| /* | |
| knockout-selectize.js (v0.1) | |
| Copyright (c) Ninjacode Limited - http://ninjacode.co.uk | |
| License: MIT (http://www.opensource.org/licenses/mit-license.php) | |
| @auther Anish Patel, Ninjacode | |
| */ | |
| (function (ko, $, undefined) { | |
| var selectizeAdapter = function (element, dataBinding) { | |
| var $selectize, hashTable, mode; | |
| var selectedObj = dataBinding.selectedObject; | |
| var selectedObjs = dataBinding.selectedObjects; | |
| var newObjs = dataBinding.newObjects; | |
| var identifier = dataBinding.valueField; | |
| var fnCreate = dataBinding.create; | |
| var createWrapper = function(input, create) { | |
| var output = fnCreate(input, create); | |
| hashTable[output[identifier]] = output; | |
| newObjs && newObjs.push(output); | |
| return output; | |
| }; | |
| var render = function (template, data) { | |
| var temp = $('<div>'); | |
| ko.applyBindingsToNode(temp[0], { template: { name: template, data: data } }); | |
| var html = temp.html(); | |
| temp.remove(); | |
| return html.trim(); | |
| } | |
| var setupRenderingOptions = function(obj) { | |
| for (var p in obj) { | |
| if (typeof obj[p] === "string") { | |
| obj[p] = (function (templateName) { | |
| return function () { | |
| return render(templateName, arguments[0]); | |
| }; | |
| })(obj[p]); | |
| } | |
| if (typeof obj[p] === "function") { | |
| obj[p] = (function (fn) { | |
| return function () { | |
| return '<div>' + fn(arguments[0]) + '</div>'; | |
| }; | |
| })(obj[p]); | |
| } | |
| } | |
| } | |
| var adapter = { | |
| single: { | |
| subsciption: null, | |
| selectHandler: function(key) { | |
| this.subsciption.dispose(); | |
| this.updateBindingContext(key); | |
| this.subscribe(); | |
| }, | |
| updateBindingContext: function(key) { | |
| selectedObj(hashTable[key] || null); | |
| }, | |
| update$selectize: function() { | |
| var obj = selectedObj(); | |
| $selectize.setValue(!!obj && ko.unwrap(obj[identifier]) || null); | |
| }, | |
| subscribe: function() { | |
| this.subsciption = selectedObj.subscribe(this.update$selectize); | |
| } | |
| }, | |
| multi: { | |
| subsciption: null, | |
| selectHandler: function(keys) { | |
| this.subsciption.dispose(); | |
| this.updateBindingContext(keys); | |
| this.subscribe(); | |
| }, | |
| updateBindingContext: function(keys) { | |
| var arr = []; | |
| for (var i in keys) { | |
| var key = keys[i]; | |
| var item = hashTable[key]; | |
| if (!item) continue; | |
| arr.push(item); | |
| } | |
| selectedObjs(arr); | |
| }, | |
| update$selectize: function() { | |
| var selectedItems = selectedObjs().map(function(item) { | |
| return item[identifier]; | |
| }); | |
| $selectize.setValue(selectedItems); | |
| }, | |
| subscribe: function() { | |
| this.subsciption = selectedObjs.subscribe(this.update$selectize, null, "arrayChange"); | |
| } | |
| } | |
| }; | |
| this.initialize = function () { | |
| var options = dataBinding; | |
| options.options = ko.unwrap(options.options); | |
| if (typeof fnCreate == "function") options.create = createWrapper; | |
| if (options.render) setupRenderingOptions(options.render); | |
| $selectize = $(element).selectize(options)[0].selectize; | |
| hashTable = $selectize.options; | |
| mode = $selectize.settings.mode; | |
| adapter[mode].subscribe.call(adapter[mode]); | |
| adapter[mode].update$selectize(); | |
| $selectize.on("change", adapter[mode].selectHandler.bind(adapter[mode])); | |
| } | |
| this.dispose = function() { | |
| $selectize.destroy(); | |
| adapter[mode].subsciption.dispose(); | |
| } | |
| } | |
| ///<summary> | |
| /// <select data-bind="selectize:{ options: observableArray, selectedObjects: observableArray, selectedObject: observable, newObjects: observableArray }"></select> | |
| ///</summary> | |
| ko.bindingHandlers.selectize = { | |
| init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) { | |
| // create adapter | |
| var adapter = new selectizeAdapter(element, valueAccessor()); | |
| // register disposal | |
| ko.utils.domNodeDisposal.addDisposeCallback(element, function() { | |
| adapter.dispose(); | |
| }); | |
| // initialize adapter | |
| adapter.initialize(); | |
| } | |
| } | |
| })(ko, $) |
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