BackboneJS - Collection Initialize


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Description

When the model instance is created, it is invoked by defining the initialize function when the collection is created.

Syntax

new Backbone.Collection(models, options)

Parameters

  • models − It specifies the initial array of models.

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

Example

<!DOCTYPE html>
<html>
   <head>
      <title>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: "sachin",
               country: "india"
            },
            
            //The model instance is invoked by defining initialize function
            initialize: function() {
               document.write("Welcome to TutorialsPoint!!!");
            }
         });
         
         //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: "sehwag",
            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>

Output

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

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

  • Open this HTML file in a browser.

backbonejs_collection.htm
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