BackboneJS-Model changedAttributes

Quiz

Description

It returns a hash of only the model's attributes that have changed since the last set or else becomes false, if there are no attributes.

Syntax

model.changedAttributes(attributes)

Parameters:

attributes: Attributes define property of a model.

Example

<!DOCTYPE html>
   <head>
      <title>Model 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: 'sachin',
         name2: 'dhoni',
         name3: 'sehwag'
      });
      values.on('change', function() {
         document.write("The changed attributes are: ");
         document.write(JSON.stringify(values.changedAttributes()));
      });
      values.set({
         name1: 'yuvraj',
         name2: 'raina'
      });
   </script>
   </body>
</html>

Output

Let's carry out the following steps to see how above code works:

Save above code in changedAttributes.htm file
Open this HTML file in a browser.

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