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BackboneJS - Collection Add
Description
It is used to add a model or array of models to the collection.
Syntax
collection.add(models,options)
Parameters
models − It contains the names of the collection instances, which need to be added in the collection.
options − It includes model types and adds them to the collection instance.
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"> //'Player' is a model and contain defualt value for model var Player = Backbone.Model.extend ({ defaults: { name: "sachin", country:"india" } }); //The 'PlayersCollection' is a collection instance and model 'Player' is specified by overriding //the 'model' property var PlayersCollection = Backbone.Collection.extend ({ model: Player }); //The instances "player1" and "player2" are created for the model "Player" var player1 = new Player({name: "dhoni", country:"india"}); var player2 = new Player({name: "raina", country:"india"}); //The add() method adds the models 'player1' and 'player2' to the collection //instance 'mycollection' var mycollection = new PlayersCollection(); mycollection.add([player1,player2]); //The 'length' property deteremines length of the collection document.write('Number of added players : ' + mycollection.length); </script> </body> </html>
Output
Let us carry out the following steps to see how the above code works −
Save the above code in the add.htm file.
Open this HTML file in a browser.
backbonejs_collection.htm
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