BackboneJS - Collection Url



It creates an instance of the collection and returns where the resource is located.




<!DOCTYPE html>
      <title>Collection Example</title>
      <script src = ""
         type = "text/javascript"></script>
      <script src = ""
         type = "text/javascript"></script>
      <script src = ""
         type = "text/javascript"></script>
      <script type = "text/javascript">
         var MyModel = Backbone.Model.extend({});  ////'MyModel' is a model name

         //The 'MyCollection' is an instance of the collection
         var MyCollection = Backbone.Collection.extend ({
            model: MyModel   //The model 'MyModel' is specified by overriding the "model" property

         //The model "MyBlog" contains default values for 'user' and 'myposts' attributes
         var MyBlog = Backbone.Model.extend ({
            defaults: {
               user: null,
               myposts: []
            initialize: function () {
               var myval = this;

               //Model 'MyModel' gets the 'user' and 'myposts' from the model 'MyBlog' by referring to 
               //the current object
               this.MyModel = new MyModel(this.get('user'));
               this.posts = new MyCollection(this.get('myposts'));
               this.posts.url = function () {
                  return myval.url() + '/myposts';

            //It enables the url() function by using the id attribute to 
            //generate the URL as "/MyBlog/50/myposts/26"
            urlRoot: '/MyBlog/'
         var attributes = {
            id: 50,
            myposts:[{id: 26}]

         //The model "MyBlog" will access the attributes and display the url using 'url()' function
         val = new MyBlog(attributes);
         val.posts.each(function (MyModel) {
            document.write("The url pattern is: ",MyModel.url());


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

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

  • Open this HTML file in a browser.