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BackboneJS - Collection Pop
Description
It is similar to the remove() method which takes the array of models and remove the models from the collection.
Syntax
collection.pop(models, options)
Parameters
models − It contains the names of the collection instances, which are needed to be popped out from the collection.
options − It includes the model type which will be removed from the collection.
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 'Player' is a model name and includes the default values var Player = Backbone.Model.extend ({ defaults: { c_id:"", country: "" } }); //The 'PlayersCollection' is a collection instance and model 'Player' is specified by using model property var PlayersCollection = Backbone.Collection.extend ({ model: Player }); //The 'country1', 'country2' and 'country3' are instances of the model 'Player' var country1 = new Player({c_id:1, country: "australia" }); var country2 = new Player({c_id:2, country: "england"}); var country3 = new Player({c_id:3, country: "india"}); var mycollection = new PlayersCollection(); //Here, the push() method adds the above models to the collection mycollection.push(country1); mycollection.push(country2); mycollection.push(country3); document.write('Number of pushed countries : ' + mycollection.length); document.write("<br>"); //The pop() method removes the models from the collection mycollection.pop(country1); mycollection.pop(country2); mycollection.pop(country3); document.write('Number of popped countries : ' + 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 pop.htm file.
Open this HTML file in a browser.
backbonejs_collection.htm
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