Backbone.js Collection Constructor

Once the model instance is created in the collection, it is invoked by defining initialize function.

Syntax:

Parameter explanation:

models: It is used to specify the initial array of models.

options: These are the collection types attached to the collection directly by passing model object.

Let's take an example.

See this example:

<!DOCTYPE html>
   <head>
      <title>Initialize Collection 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 model 'MyTeam' contains default values and extended using the Backbone.Model class
         var MyTeam = Backbone.Model.extend({
            defaults: {
               player: "Dhoni",
      country: "India"
            },
            //The model instance is invoked by defining initialize function
            initialize: function(){
               document.write("Welcome to JavaTpoint");
            }
        });

        //The 'MyTeam1' is a collection instance and model 'MyTeam' is specified by overriding the 'model' property
        var MyTeam1 = Backbone.Collection.extend({
           model: MyTeam
        });
        var player1 = new MyTeam({
           player: "Ajeet",
           country: "India"
        });
      //The 'player1' is a type of collection by passing model object in the collection
        var myval=new MyTeam1([player1]);

        //The 'myval.models' define the array of models inside the collection
        document.write("<br>"+JSON.stringify(myval.models));
      </script>
   </body>
</html>
  

Test it Now

Output:

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