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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<meta name=”description” content=”Backbone.js tutorial code sample”>  
<link rel=”author” href=”https://plus.google.com/u/0/+ArvindRavulavaru“/>
<title>Backbone.js Tutorial - Arvind Ravulavaru</title>
  
</head>
<body>
  
  
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
  <script type="text/javascript" src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
  <script type="text/javascript" src="http://documentcloud.github.com/backbone/backbone-min.js"></script>  
</body>
</html>
 
var Todo = Backbone.Model.extend({
  defaults: {
    completed: false
  },
​
  validate: function(attributes){
    if(attributes.title === undefined){
        return "Remember to set a title for your todo.";
    }
  },
​
  initialize: function(){
    console.log('This model has been initialized.');
    this.on("invalid", function(model, error){
        console.log(error);
    });
  }
});
​
var myTodo = new Todo();
myTodo.set('completed', true, {validate: true}); // logs: Remember to set a title for your todo.
console.log('completed: ' + myTodo.get('completed')); // completed: false
Output

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