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482 lines
18 KiB
JavaScript
482 lines
18 KiB
JavaScript
// Backbone.ModelBinder v0.1.6
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// (c) 2012 Bart Wood
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// Distributed Under MIT License
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(function (factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define(['underscore', 'jquery', 'backbone'], factory);
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} else {
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// Browser globals
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factory(_, $, Backbone);
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}
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}(function (_, $, Backbone) {
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if (!Backbone) {
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throw 'Please include Backbone.js before Backbone.ModelBinder.js';
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}
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Backbone.ModelBinder = function (modelSetOptions) {
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_.bindAll(this);
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this._modelSetOptions = modelSetOptions || {};
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};
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// Current version of the library.
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Backbone.ModelBinder.VERSION = '0.1.6';
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Backbone.ModelBinder.Constants = {};
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Backbone.ModelBinder.Constants.ModelToView = 'ModelToView';
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Backbone.ModelBinder.Constants.ViewToModel = 'ViewToModel';
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_.extend(Backbone.ModelBinder.prototype, {
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bind: function (model, rootEl, attributeBindings, modelSetOptions) {
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this.unbind();
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this._model = model;
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this._rootEl = rootEl;
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this._modelSetOptions = _.extend({}, this._modelSetOptions, modelSetOptions);
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if (!this._model) throw 'model must be specified';
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if (!this._rootEl) throw 'rootEl must be specified';
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if (attributeBindings) {
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// Create a deep clone of the attribute bindings
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this._attributeBindings = $.extend(true, {}, attributeBindings);
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this._initializeAttributeBindings();
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this._initializeElBindings();
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}
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else {
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this._initializeDefaultBindings();
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}
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this._bindModelToView();
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this._bindViewToModel();
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},
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bindCustomTriggers: function (model, rootEl, triggers, attributeBindings, modelSetOptions) {
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this._triggers = triggers;
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this.bind(model, rootEl, attributeBindings, modelSetOptions)
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},
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unbind: function () {
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this._unbindModelToView();
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this._unbindViewToModel();
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if (this._attributeBindings) {
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delete this._attributeBindings;
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this._attributeBindings = undefined;
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}
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},
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// Converts the input bindings, which might just be empty or strings, to binding objects
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_initializeAttributeBindings: function () {
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var attributeBindingKey, inputBinding, attributeBinding, elementBindingCount, elementBinding;
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for (attributeBindingKey in this._attributeBindings) {
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inputBinding = this._attributeBindings[attributeBindingKey];
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if (_.isString(inputBinding)) {
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attributeBinding = { elementBindings: [{ selector: inputBinding }] };
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}
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else if (_.isArray(inputBinding)) {
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attributeBinding = { elementBindings: inputBinding };
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}
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else if (_.isObject(inputBinding)) {
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attributeBinding = { elementBindings: [inputBinding] };
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}
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else {
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throw 'Unsupported type passed to Model Binder ' + attributeBinding;
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}
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// Add a linkage from the element binding back to the attribute binding
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for (elementBindingCount = 0; elementBindingCount < attributeBinding.elementBindings.length; elementBindingCount++) {
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elementBinding = attributeBinding.elementBindings[elementBindingCount];
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elementBinding.attributeBinding = attributeBinding;
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}
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attributeBinding.attributeName = attributeBindingKey;
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this._attributeBindings[attributeBindingKey] = attributeBinding;
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}
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},
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// If the bindings are not specified, the default binding is performed on the name attribute
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_initializeDefaultBindings: function () {
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var elCount, namedEls, namedEl, name, attributeBinding;
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this._attributeBindings = {};
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namedEls = $('[name]', this._rootEl);
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for (elCount = 0; elCount < namedEls.length; elCount++) {
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namedEl = namedEls[elCount];
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name = $(namedEl).attr('name');
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// For elements like radio buttons we only want a single attribute binding with possibly multiple element bindings
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if (!this._attributeBindings[name]) {
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attributeBinding = { attributeName: name };
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attributeBinding.elementBindings = [{ attributeBinding: attributeBinding, boundEls: [namedEl] }];
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this._attributeBindings[name] = attributeBinding;
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}
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else {
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this._attributeBindings[name].elementBindings.push({ attributeBinding: this._attributeBindings[name], boundEls: [namedEl] });
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}
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}
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},
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_initializeElBindings: function () {
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var bindingKey, attributeBinding, bindingCount, elementBinding, foundEls, elCount, el;
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for (bindingKey in this._attributeBindings) {
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attributeBinding = this._attributeBindings[bindingKey];
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for (bindingCount = 0; bindingCount < attributeBinding.elementBindings.length; bindingCount++) {
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elementBinding = attributeBinding.elementBindings[bindingCount];
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if (elementBinding.selector === '') {
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foundEls = $(this._rootEl);
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}
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else {
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foundEls = $(elementBinding.selector, this._rootEl);
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}
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if (foundEls.length === 0) {
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throw 'Bad binding found. No elements returned for binding selector ' + elementBinding.selector;
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}
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else {
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elementBinding.boundEls = [];
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for (elCount = 0; elCount < foundEls.length; elCount++) {
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el = foundEls[elCount];
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elementBinding.boundEls.push(el);
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}
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}
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}
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}
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},
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_bindModelToView: function () {
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this._model.on('change', this._onModelChange, this);
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this.copyModelAttributesToView();
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},
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// attributesToCopy is an optional parameter - if empty, all attributes
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// that are bound will be copied. Otherwise, only attributeBindings specified
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// in the attributesToCopy are copied.
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copyModelAttributesToView: function (attributesToCopy) {
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var attributeName, attributeBinding;
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for (attributeName in this._attributeBindings) {
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if (attributesToCopy === undefined || _.indexOf(attributesToCopy, attributeName) !== -1) {
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attributeBinding = this._attributeBindings[attributeName];
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this._copyModelToView(attributeBinding);
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}
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}
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},
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_unbindModelToView: function () {
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if (this._model) {
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this._model.off('change', this._onModelChange);
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this._model = undefined;
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}
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},
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_bindViewToModel: function () {
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if (this._triggers) {
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_.each(this._triggers, function (event, selector) {
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$(this._rootEl).delegate(selector, event, this._onElChanged);
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}, this);
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}
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else {
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$(this._rootEl).delegate('', 'change', this._onElChanged);
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// The change event doesn't work properly for contenteditable elements - but blur does
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$(this._rootEl).delegate('[contenteditable]', 'blur', this._onElChanged);
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}
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},
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_unbindViewToModel: function () {
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if (this._rootEl) {
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if (this._triggers) {
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_.each(this._triggers, function (event, selector) {
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$(this._rootEl).undelegate(selector, event, this._onElChanged);
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}, this);
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}
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else {
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$(this._rootEl).undelegate('', 'change', this._onElChanged);
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$(this._rootEl).undelegate('[contenteditable]', 'blur', this._onElChanged);
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}
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}
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},
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_onElChanged: function (event) {
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var el, elBindings, elBindingCount, elBinding;
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el = $(event.target)[0];
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elBindings = this._getElBindings(el);
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for (elBindingCount = 0; elBindingCount < elBindings.length; elBindingCount++) {
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elBinding = elBindings[elBindingCount];
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if (this._isBindingUserEditable(elBinding)) {
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this._copyViewToModel(elBinding, el);
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}
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}
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},
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_isBindingUserEditable: function (elBinding) {
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return elBinding.elAttribute === undefined ||
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elBinding.elAttribute === 'text' ||
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elBinding.elAttribute === 'html';
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},
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_getElBindings: function (findEl) {
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var attributeName, attributeBinding, elementBindingCount, elementBinding, boundElCount, boundEl;
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var elBindings = [];
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for (attributeName in this._attributeBindings) {
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attributeBinding = this._attributeBindings[attributeName];
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for (elementBindingCount = 0; elementBindingCount < attributeBinding.elementBindings.length; elementBindingCount++) {
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elementBinding = attributeBinding.elementBindings[elementBindingCount];
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for (boundElCount = 0; boundElCount < elementBinding.boundEls.length; boundElCount++) {
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boundEl = elementBinding.boundEls[boundElCount];
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if (boundEl === findEl) {
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elBindings.push(elementBinding);
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}
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}
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}
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}
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return elBindings;
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},
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_onModelChange: function () {
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var changedAttribute, attributeBinding;
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for (changedAttribute in this._model.changedAttributes()) {
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attributeBinding = this._attributeBindings[changedAttribute];
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if (attributeBinding) {
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this._copyModelToView(attributeBinding);
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}
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}
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},
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_copyModelToView: function (attributeBinding) {
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var elementBindingCount, elementBinding, boundElCount, boundEl, value, convertedValue;
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value = this._model.get(attributeBinding.attributeName);
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for (elementBindingCount = 0; elementBindingCount < attributeBinding.elementBindings.length; elementBindingCount++) {
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elementBinding = attributeBinding.elementBindings[elementBindingCount];
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for (boundElCount = 0; boundElCount < elementBinding.boundEls.length; boundElCount++) {
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boundEl = elementBinding.boundEls[boundElCount];
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if (!boundEl._isSetting) {
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convertedValue = this._getConvertedValue(Backbone.ModelBinder.Constants.ModelToView, elementBinding, value);
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this._setEl($(boundEl), elementBinding, convertedValue);
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}
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}
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}
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},
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_setEl: function (el, elementBinding, convertedValue) {
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if (elementBinding.elAttribute) {
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this._setElAttribute(el, elementBinding, convertedValue);
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}
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else {
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this._setElValue(el, convertedValue);
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}
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},
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_setElAttribute: function (el, elementBinding, convertedValue) {
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switch (elementBinding.elAttribute) {
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case 'html':
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el.html(convertedValue);
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break;
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case 'text':
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el.text(convertedValue);
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break;
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case 'enabled':
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el.attr('disabled', !convertedValue);
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break;
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case 'displayed':
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el[convertedValue ? 'show' : 'hide']();
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break;
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case 'hidden':
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el[convertedValue ? 'hide' : 'show']();
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break;
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case 'css':
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el.css(elementBinding.cssAttribute, convertedValue);
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break;
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case 'class':
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var previousValue = this._model.previous(elementBinding.attributeBinding.attributeName);
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if (!_.isUndefined(previousValue)) {
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previousValue = this._getConvertedValue(Backbone.ModelBinder.Constants.ModelToView, elementBinding, previousValue);
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el.removeClass(previousValue);
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}
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if (convertedValue) {
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el.addClass(convertedValue);
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}
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break;
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default:
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el.attr(elementBinding.elAttribute, convertedValue);
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}
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},
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_setElValue: function (el, convertedValue) {
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if (el.attr('type')) {
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switch (el.attr('type')) {
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case 'radio':
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if (el.val() === convertedValue) {
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el.attr('checked', 'checked');
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}
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break;
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case 'checkbox':
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if (convertedValue) {
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el.attr('checked', 'checked');
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}
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else {
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el.removeAttr('checked');
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}
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break;
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default:
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el.val(convertedValue);
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}
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}
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else if (el.is('input') || el.is('select') || el.is('textarea')) {
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el.val(convertedValue);
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}
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else {
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el.text(convertedValue);
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}
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},
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_copyViewToModel: function (elementBinding, el) {
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var value, convertedValue;
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if (!el._isSetting) {
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el._isSetting = true;
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this._setModel(elementBinding, $(el));
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el._isSetting = false;
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if (elementBinding.converter) {
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value = this._model.get(elementBinding.attributeBinding.attributeName);
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convertedValue = this._getConvertedValue(Backbone.ModelBinder.Constants.ModelToView, elementBinding, value);
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this._setEl($(el), elementBinding, convertedValue);
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}
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}
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},
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_getElValue: function (elementBinding, el) {
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switch (el.attr('type')) {
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case 'checkbox':
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return el.prop('checked') ? true : false;
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default:
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if (el.attr('contenteditable') !== undefined) {
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return el.html();
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}
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else {
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return el.val();
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}
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}
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},
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_setModel: function (elementBinding, el) {
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var data = {};
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var elVal = this._getElValue(elementBinding, el);
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elVal = this._getConvertedValue(Backbone.ModelBinder.Constants.ViewToModel, elementBinding, elVal);
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data[elementBinding.attributeBinding.attributeName] = elVal;
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var opts = _.extend({}, this._modelSetOptions, { changeSource: 'ModelBinder' });
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this._model.set(data, opts);
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},
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_getConvertedValue: function (direction, elementBinding, value) {
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if (elementBinding.converter) {
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value = elementBinding.converter(direction, value, elementBinding.attributeBinding.attributeName, this._model);
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}
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return value;
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}
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});
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Backbone.ModelBinder.CollectionConverter = function (collection) {
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this._collection = collection;
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if (!this._collection) {
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throw 'Collection must be defined';
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}
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_.bindAll(this, 'convert');
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};
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_.extend(Backbone.ModelBinder.CollectionConverter.prototype, {
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convert: function (direction, value) {
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if (direction === Backbone.ModelBinder.Constants.ModelToView) {
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return value ? value.id : undefined;
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}
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else {
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return this._collection.get(value);
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}
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}
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});
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// A static helper function to create a default set of bindings that you can customize before calling the bind() function
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// rootEl - where to find all of the bound elements
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// attributeType - probably 'name' or 'id' in most cases
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// converter(optional) - the default converter you want applied to all your bindings
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// elAttribute(optional) - the default elAttribute you want applied to all your bindings
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Backbone.ModelBinder.createDefaultBindings = function (rootEl, attributeType, converter, elAttribute) {
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var foundEls, elCount, foundEl, attributeName;
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var bindings = {};
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foundEls = $('[' + attributeType + ']', rootEl);
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for (elCount = 0; elCount < foundEls.length; elCount++) {
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foundEl = foundEls[elCount];
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attributeName = $(foundEl).attr(attributeType);
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if (!bindings[attributeName]) {
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var attributeBinding = { selector: '[' + attributeType + '="' + attributeName + '"]' };
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bindings[attributeName] = attributeBinding;
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if (converter) {
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bindings[attributeName].converter = converter;
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}
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if (elAttribute) {
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bindings[attributeName].elAttribute = elAttribute;
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}
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}
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}
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return bindings;
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};
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// Helps you to combine 2 sets of bindings
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Backbone.ModelBinder.combineBindings = function (destination, source) {
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_.each(source, function (value, key) {
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var elementBinding = { selector: value.selector };
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if (value.converter) {
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elementBinding.converter = value.converter;
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}
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if (value.elAttribute) {
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elementBinding.elAttribute = value.elAttribute;
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}
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if (!destination[key]) {
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destination[key] = elementBinding;
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}
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else {
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destination[key] = [destination[key], elementBinding];
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}
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});
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return destination;
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};
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return Backbone.ModelBinder;
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})); |