Backbone.js collection.set()

The backbone.js collection set method performs a smart update of the collection with a set of items in the model. If a model in the list isn't yet in the collection it will be added; if the model is already in the collection its attributes will be merged.

Syntax:

Parameter explanation:

models: It specifies an instance of the collection along with values to be set in the collection.

options: It contains parameters such as id, name etc. to set the values in the collection.

Let's take an example.

See this example:

 <!DOCTYPE html>
   <head>
      <title>Set 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">
         //Here the model name is 'Player' and contains default value
         var Player = Backbone.Model.extend({
            defaults: {
               name: 'Sachin'
            },
         });

         //'PlayersCollection' is an instance of collection
         var PlayersCollection = Backbone.Collection.extend({
            model: Player  //model 'Player' is specified by using model property
         });
         var player1 = new Player({ name: "Dravid" });  //'player1' is instance of the model
         var mycollection = new PlayersCollection();   //'mycollection' is instance of the collection
         mycollection.add(player1);                    //adding model instance 'player1' along with value to the collection

         //The set() method update the 'player1' model by passing this value in the collection
         mycollection.set([player1, { name: "Ganguly" }]);
         document.write(JSON.stringify(mycollection.toJSON()));
         </script>
         </body>
      </html>

Test it Now

Output:

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