BackboneJS - Router Extend



It extends the backbone's router class and creates a new constructor which inherits from the Backbone.Router.


Backbone.Router.extend(properties, classProperties)


  • properties − It provides instance properties for the router class.

  • classProperties − The class properties are attached to the router's constructor function.


<!DOCTYPE html>
      <title>Router Example</title>
      <script src = ""
         type = "text/javascript"></script>
      <script src = ""
         type = "text/javascript"></script>
      <script src = ""
         type = "text/javascript"></script>

      <script type = "text/javascript">
         //'RouteMenu' is a name of the view class
         var RouteMenu = Backbone.View.extend ({
            el: '#routemenu',  //'el' defines which element to be used as the view reference

            //defines a click event to occur on link
            events: {
               'click a' : 'onClick'

            //After clicking on a link, router calls 'navigate' to update URL
            onClick: function( e ) {

         //'Router' is a name of the router class
         var Router = Backbone.Router.extend ({

            //The 'routes' maps URLs with parameters to functions on your router
            routes: {
               'route/:id' : 'defaultRoute'

         //'routemenu' is an instance of the view class
         var routemenu = new RouteMenu();

         //It starts listening to the routes and manages the history for bookmarkable URL's
      <section id = "routemenu">
            <li> <a href = "#/route/1">route 1 </a> </li>
            <li> <a href = "#/route/2">route 2 </a> </li>
            <li> <a href = "#/route/3">route 3 </a> </li>


Let us carry out the following steps to see how the above code works −

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

  • Open this HTML file in a browser.

NOTE − The above functionality is related to the address bar. So, when you open the above code in the browser, it will show as follows.

extend example

Click here for the demo