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