Difference between id and cid properties on a model object in Backbone.js

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Backbone.js is a compact library used to organize JavaScript code. An MVC/MV* framework is another term for it. If MVC is unfamiliar to you, it is merely a technique for designing user interfaces. The creation of a program’s user interface is made considerably easier by JavaScript functions. BackboneJS provides a variety of building elements to aid developers in creating client-side web applications, including models, views, events, routers, and collections.

Backbone.js id Model: The Backbone.js id model is utilized to locate the specific identification in a model. It can be manually set, and a server will later store it.

Syntax:

Backbone.Model.id

Parameters: It does not accept any parameter.

Example 1: The code below demonstrates how to use the id property of the model object.

HTML

<html>
 
<head>
    <script src=
"https://code.jquery.com/jquery-3.1.0.min.js"></script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.3.3/backbone-min.js">
    </script>
</head>
 
<body>
    <h1 style="color:green;">
        zambiatek
    </h1>
 
    <h3>Explain difference between the properties 
          "id" and "cid" on a model object in Backbone.js?</h3>
    <h4>Here we uses the cid property of Model</h4>
 
    <script>
        var Books = Backbone.Model.extend();
        var student = new Books({
            studentid: 10,
            name: 'Jane Doe',
            Age: 17
        });
 
        console.log("Student ID: ", student.get('studentid')); 
    </script>
</body>
 
</html>

Output:

Backbone.js cid Model: The Backbone.js cid Model is a unique identifier to the model. When a model is first built, it is automatically allocated to it. When we didn’t provide the model with a special identifier, Cid is helpful. Client ID is the meaning of the cid.

Syntax:

Backbone.model.cid

Parameters: It does not accept any parameters.

Example 2: The code below demonstrates how to use the cid property of the model object.

HTML

<html>
 
<head>
    <script src=
"https://code.jquery.com/jquery-3.1.0.min.js"></script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.3.3/backbone-min.js">
    </script>
</head>
 
<body>
    <h1 style="color:green;">
        zambiatek
    </h1>
 
    <h3>Explain difference between the properties 
      "id" and "cid" on a model object in Backbone.js?</h3>
    <br>
 
    <script>
        var Student = Backbone.Model.extend();
        var student1 = new Student();
        var student2 = new Student();
        var student3 = new Student();
        var student4 = new Student();
        var student5 = new Student();
       
        console.log("Cid of first instance of Book : "
            + student1.cid + '<br>');
        console.log("Cid of second instance of Book : "
            + student2.cid + '<br>');
        console.log("Cid of third instance of Book : "
            + student3.cid + '<br>');
        console.log("Cid of fourth instance of Book : "
            + student4.cid + '<br>');
        console.log("Cid of fifth instance of Book : "
            + student5.cid + '<br>');
    </script>
</body>
 
</html>

Output:

The difference between the properties “id” and “cid” on a model object:

id	cid
Based on the “id” value set in the model’s attributes hash, the “id” property on a model is automatically assigned.	The “cid” is a temporary ID given to each model that can be used until an actual ID for the item is established.
Once this is set it will stay fixed for the model object	This is created at first and it is temporary and gets destroyed afterwards.
Syntax: Backbone.Model.id	Syntax: Backbone.Model.cid

Reference: https://backbonejs.org/#Model-id, https://backbonejs.org/#Model-cid

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