Backbone.js model.changedAttributes()

The Backbone.js changedAttributes model returns the hash of model' s attributes that have been changed since the last set. If there are no attributes, it becomes false.

Syntax:

Parameter explanation:

attributes: attributes define the property of a model.

Let's take an example.

See this example:

 <!DOCTYPE html>
   <head>
      <title>changedAttributes Example</title>
         <script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type="text/javascript"></script>
   </head>
   <body>
   <script type="text/javascript">
      var values = new Backbone.Model({
         name1: 'Amar',
         name2: 'Akbar',
         name3: 'Anthony'
      });
      values.on('change', function() {
         document.write("The changed attributes are: ");
         document.write(JSON.stringify(values.changedAttributes()));
      });
      values.set({
         name1: 'Peter',
         name2: 'Mark'
      });
   </script>
   </body>
</html>

Test it Now

Output:

Save the above code in changedattributes.html file and open this file in a new browser.