步骤 2: 使用事件解除依赖.
这个例子,利用MVC框架是关键。我们将会用到事件机制, 事件使我们结合和触发自定义事件. 因此,我们创建新的“AnimalsView”和“NewAnimalView”,并且赋予它们不同的显示animals的职责。 使用事件就来区别职责非常简单。如果在方法和事件之间传递职责,如下所示:
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var events = _.clone(Backbone.Events); |
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var Animals = function () { |
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Animals.prototype.add = function (text) { |
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success: function (data) { |
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events.trigger( ‘animal:add‘ , data.text); |
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var NewAnimalView = function (options) { |
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this .animals = options.animals; |
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events.on( ‘animal:add‘ , this .clearAnimal, this ); |
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var add = $.proxy( this .addAnimal, this ); |
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$( ‘# form‘ ).submit(add); |
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NewAnimalView.prototype.addAnimal = function (e) { |
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this .animals.add($( ‘#new-animal textarea‘ ).val()); |
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NewAnimalView.prototype.clearInput = function () { |
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$( ‘#new-animal textarea‘ ).val( ‘‘ ); |
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var AnimalsView = function () { |
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events.on( ‘animal:add‘ , this .appendAnimal, this ); |
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AnimalsView.prototype.appendAnimal = function (text) { |
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$( ‘#animals ul‘ ).append( ‘<li>‘ + data.text + ‘</li>‘ ); |
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$(document).ready( function () { |
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var animals = new Animals(); |
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new NewAnimalView({ animals: animals }); |
步骤 3: 传递数据结构到核心框架
最后,最重要的一步,我们使用: models, views and collections.
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var Animal = Backbone.Model.extend({ |
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var Animals = Backbone.Collection.extend({ |
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var AnimalsView = Backbone.View.extend({ |
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initialize: function () { |
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this .collection.on( ‘add‘ , this .appendAnimal, this ); |
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appendAnimal: function (animal) { |
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this .$( ‘ul‘ ).append( ‘<li>‘ + animal.escape( ‘text‘ ) + ‘</li>‘ ); |
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var NewAnimalView = Backbone.View.extend({ |
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‘submit form‘ : ‘addAnimal‘ |
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initialize: function () { |
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this .collection.on( ‘add‘ , this .clearInput, this ); |
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addAnimal: function (e) { |
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this .collection.create({ text: this .$( ‘textarea‘ ).val() }); |
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clearInput: function () { |
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this .$( ‘textarea‘ ).val( ‘‘ ); |
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$(document).ready( function () { |
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var animals = new Animals(); |
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new NewAnimalView({ el: $( ‘#new-animal‘ ), collection: animals }); |
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new AnimalsView({ el: $( ‘#animals‘ ), collection: animals }); |
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