BackboneJS - Sync Backbone.sync

Description

It is a function that Backbone calls every time to read or save the model to the server. It represents the state of the model.

Syntax

sync.(method, model, options)

Parameters

method − It represents the CRUD operations such as create, read, update and delete.
model − It includes the model to be saved.
options − It fires success or error messages depending on the method succeeded.

Example

Live Demo

<!DOCTYPE html>
<html>
   <head>
      <title>Sync 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 fetched 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));
         };

         //'myval' is a 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 displays the model's state by delegating to 
         //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 backbone-sync.htm file.
Open this HTML file in a browser.

backbonejs_sync.htm