Backbone.js Event trigger()

The Backbone.js event trigger method evokes the callback functions for the given events.

Syntax:

Parameter explanation:

event: It is used to bind an object.

args: It is used to pass values/arguments to the callback function.

Let's take an example.

See this example:

<!DOCTYPE html>
  <head>
    <title>Event Trigger 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">
     	//Created an object 'myVal' and extended it using Backbone.Events method
        var myVal = _.extend({title:'JavaTpoint', site:'www.javatpoint.com'}, Backbone.Events);

        //The on() method will bind the callback function to an object
        myVal.on('myFunc', function () {
           document.write("The triggered value for site is: ");
           document.write(this.site); //value of site will get displayed by referring the current object
        });

        // The trigger() method triggers the 'myFunc' event on 'myVal'
        myVal.trigger('myFunc');
     </script>
   </body>
</html>

Test it Now

Output:

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