BackboneJS - Collection Sync


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Description

It uses Backbone.sync to persist the state of a collection to the server.

Syntax

collection.sync(method, collection, options)

Parameters

  • method − It represents the CRUD operations such as create, read, update and delete.

  • collection − It contains a set of models to save the data in the collection.

  • options − It fires success or error message depending on the method succeeded.

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 sync() method reads and fetches the model data
         Backbone.sync = function(method, model) {
            document.write("The state of the model is:");
            document.write("<br>");

            //The 'method' specifies state of the model
            document.write(method + ": " + JSON.stringify(model));
         };
         
         //The 'myval' is collection instance and contains the values which are to be fetched 
         //in the collection
         var myval = new Backbone.Collection ({
            site:"TutorialsPoint",
            title:"Simply Easy Learning..."
         });

         //The myval.fetch() method display the model's state by delegating the sync() method
         myval.fetch();
      </script>
      
   </body>
</html>

Output

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

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

  • Open this HTML file in a browser.

backbonejs_collection.htm
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