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November 5, 2012 02:18
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Demo: How to Effectively Remove Backbone Views to Avoid Memory Leaks
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <title>Backbone Memory Management</title> | |
| <link href="style.css"> | |
| <link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.1.1/css/bootstrap-combined.min.css" rel="stylesheet"> | |
| </head> | |
| <body> | |
| <div id="app" class="container"> | |
| <h1>Zombie Destroyer 3000</h1> | |
| <button id="add" class="btn btn-primary">Add</button> <button id="remove-all" class="btn btn-primary">Remove All</button> | |
| <ol id="bin"></ol> | |
| </div> | |
| <script type="text/javascript" src="http://code.jquery.com/jquery-1.8.0.min.js"></script> | |
| <script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.2/underscore-min.js"></script> | |
| <script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.2/backbone-min.js"></script> | |
| <script type="text/javascript" src="script.js"></script> | |
| </body> | |
| </html> |
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| // Model | |
| // ------------------ | |
| var Model = Backbone.Model.extend({ | |
| defaults: { | |
| text: 'Zombie' | |
| } | |
| }); | |
| // View | |
| // ------------------ | |
| var View = Backbone.View.extend({ | |
| tagName: 'li', | |
| className: 'zombie', | |
| template: _.template('<%= text %>'), | |
| initialize: function () { | |
| this.model.on( 'change', this.render, this ); | |
| this.options.parent.on( 'close:all', this.close, this ); | |
| }, | |
| events: { | |
| 'click': 'close' | |
| }, | |
| render: function () { | |
| this.$el.html( this.template( this.model.toJSON() )); | |
| return this; | |
| }, | |
| close: function () { | |
| console.log('Kill: ', this); | |
| this.unbind(); // unbind all internal event bindings | |
| this.model.unbind( 'change', this.render, this ); // unbind reference to the model | |
| this.options.parent.unbind( 'close:all', this.close, this ); // unbind reference to the parent view | |
| this.remove(); | |
| delete this.$el; // delete any jQuery wrapped objects | |
| delete this.el; // delete the variable reference to this node | |
| } | |
| }); | |
| // App Level View | |
| // ------------------ | |
| var AppView = Backbone.View.extend({ | |
| el: '#app', | |
| events: { | |
| 'click #add': 'addView', | |
| 'click #remove-all': 'closeAll' | |
| }, | |
| addView: function () { | |
| var model = new Model(); | |
| var view = new View({ | |
| model: model, | |
| parent: this | |
| }); | |
| $('#bin').append(view.render().el); | |
| }, | |
| closeAll: function () { | |
| this.trigger('close:all'); | |
| } | |
| }); | |
| // DOC Ready | |
| // ------------------ | |
| $(function() { | |
| var appView = new AppView(); | |
| }); |
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what the code in line 26 does? this.options.....