Backbone.js model.hasChanged()

The Backbone.js hasChanged model returns true if you make a change in the attribute since the last set.

Syntax:

Parameter explanation:

attributes: It defines property of a model.

Let's take an example.

See this example:

 <!DOCTYPE html>
   <head>
      <title> Haschanged 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>
         <script type="text/javascript">
            var person = new Backbone.Model({
               name: 'Aryan'
            });
            document.write('Has name changed (before set) = ' + person.hasChanged());
            person.set('name', 'Raj', {silent: true});
            document.write('<br>Has name changed (after set) =' + person.hasChanged());
            </script>
            </body>
            </html>

Test it Now

Output:

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