Backbone.js parse Collection

Last Updated : 28 Jul, 2022

The Backbone.js parse Collection is a method that is called by Backbone whenever a Collection’s models are returned by the server. The default implementation simply passes the JSON response. We can override it with a new logic to flexibly parse the response.

Syntax:

collection.parse( response , options );

Parameters:

response: It is a raw object which contains data regarding the request to the server.
options: These are the optional parameter regarding the response to the request.

Example 1: In this example, we will illustrate the Backbone.js parse Collection. Here we will parse our Models when we pass them to the collection at the initiation of collection.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>BackboneJS parse collection</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 parse collection</h3> 
      
    <script type="text/javascript"> 
        var Book = Backbone.Model.extend(); 
  
        var b1 = {  
            title: "Ram",  
            Author: "Amish Tripathi",  
            vol: 1  
        }; 
          
        var b2 = {  
            title: "Lolita", 
            Author: "Vladimir Nabokov",  
            vol: 2  
        }; 
          
        var b3 = {  
            title: "The Palace of Illusion",  
            Author: "Chitra Banerjee",  
            vol: 1  
        }; 
  
        var books = Backbone.Collection.extend({ 
            model: Book, 
            parse: function (response, options) { 
                for (let x of response) 
                    document.write(JSON.stringify(x), '<br>'); 
            } 
        }); 
  
        var Library = new books([b1, b2, b3], { parse: true }); 
    </script> 
</body> 
  
</html>

Output:

Backbone.js parse Collection

Example 2: In this example, we will parse the data which is coming as a result of the fetch request.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>BackboneJS parse collection</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 parse collection</h3> 
      
    <div id='para'> </div> 
      
    <script type="text/javascript"> 
        function user_Name(user) { 
            console.log(user.username); 
        } 
  
        var post = Backbone.Model.extend(); 
  
        var posts = Backbone.Collection.extend({ 
            model: post, 
            url: "https://...com/users", 
  
            parse: function (response, options) { 
                _.each(response, user_Name); 
            } 
        }); 
  
        var comments = new posts(); 
        comments.fetch(); 
    </script> 
</body> 
  
</html>