Backbone.js sync Model

Last Updated : 13 Jul, 2022

Backbone.js sync Model is the function that the model calls every time it attempts to read or save a model to the server. When a model begins a sync with the server, a request event is emitted. If the request completes successfully you’ll get a sync event and an error event if not.

Syntax:

model.sync( method, model, options );

Parameters: It takes the following parameters:

method: It is the CRUD method, which stands for C for create, R for read, U for update, and D for delete.
model: It is a model which has to save, or read.
options: It is success and error callbacks and other jQuery request options.

Example#1: In this example, we will describe the Backbone.js sync Model with read and delete method.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>BackboneJS Model sync</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/1.2.2/backbone-min.js" 
            type="text/javascript"> 
    </script> 
</head> 
  
<body> 
    <h1 style="color: green;"> 
        GeeksforGeeks 
    </h1> 
  
    <h3>BackboneJS Model sync</h3> 
  
    <script type="text/javascript"> 
  
  
        var Geek = new Backbone.Model({ 
            id: "1001e", 
            Name: "Cody" 
        }); 
  
        Geek.sync = function (method, model) { 
            document.write(`This is sync function which is  
            called for ${method} an model ` +  
                           JSON.stringify(model), '<br>'); 
        }; 
  
        Geek.fetch(); 
        Geek.destroy(); 
    </script> 
</body> 
  
</html>

Output:

Backbone.js sync model

Example#2: In this example we will describe the Backbone.js sync model with update method.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>BackboneJS Model sync</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/1.2.2/backbone-min.js" 
            type="text/javascript"> 
    </script> 
</head> 
  
<body> 
    <h1 style="color: green;"> 
        GeeksforGeeks 
    </h1> 
  
    <h3>BackboneJS Model sync</h3> 
  
  
  
  
    <script type="text/javascript"> 
        Backbone.sync = function (method, model) { 
            document.write(`This is sync function which is  
            called for ${method} an model ` +  
                           JSON.stringify(model), '<br>'); 
        }; 
  
        var Geek = new Backbone.Model({ 
            id: "1001e", 
            Name: "Cody" 
        }); 
  
        Geek.sync = function (method, model) { 
            document.write(`This is sync function which is  
            called for ${method} an model ` +  
                           JSON.stringify(model), '<br>'); 
        }; 
  
        Geek.save(); 
        Geek.save({ id: "1002e", Name: "zetshu" }); 
    </script> 
</body> 
  
</html>