BackboneJS - Event Once

BackboneJS - Event Once

<!DOCTYPE html>
<html>

   <head>
      <title>Event Once 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">
         //The created object 'myVal' is extended using Backbone.Events method
         var myVal = _.extend({name:'CodingDict!!!'}, Backbone.Events);

         //The once() method causes the bound callback to only fire once before being removed
         myVal.once('hello', function () {
            document.write("The value after firing once is: ");
            document.write(this.name);//name will get displayed by referring the current object
         });

         //It triggers the 'hello' event on object 'myVal'
         myVal.trigger('hello');
      </script>

   </body>
</html>