You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
482 lines
18 KiB
482 lines
18 KiB
// 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;
|
|
|
|
})); |