BackboneJS - Model changedAttributes


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Description

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

Syntax

model.changedAttributes(attributes)

Parameters

attributes − Attributes define the property of a model.

Example

<!DOCTYPE html>
<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 us carry out the following steps to see how the above code works −

  • Save the above code in the changedattributes.htm file.

  • Open this HTML file in a browser.

backbonejs_model.htm
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