Backbone.js – Basic Understanding of Model

Backbone.js Models

When we talk about MVC pattern, Model becomes very important part of this. It is the Model which contains application data. The authors of backbone.js have quite a clear definition of what they believe the model represents in Backbone.js.

Models are the heart of any JavaScript application, containing the interactive data as well as a large part of the logic surrounding it: conversions, validations, computed properties, and access control.

What we have till now-

In my last post Backbone.js, We have created a HTML page named main.html in which we had included the required script files. Let's create a new js file main.js and includes this file in our main.html page.

<HTML>
 <Head>
  <title>Backbone js Tutorial</title>
 </Head>
 <Body>

  <script src="scripts/underscore-min.js"></script>
  <script src="scripts/jquery-1.11.3.min.js"></script>
  <script src="scripts/backbone-min.js"></script>
  <script src="scripts/main.js"></script>
 </Body>
</HTML>

Defining the Model-

You can define the model by extending the Backbone.Model class.

var Person = Backbone.Model.extend({
 defaults:{
          FName:"Manish",
   LName:"Dubey",
   Age : 28
  }
});

In the above code , we are defining a model "TodoItem" with some default values like "FName" ,"LName" and "Age".

Instantiating the Model-

You can simply instantiate the model using new keyword.

var person = new Person(); // will create the object of Person Model.

Getters-

In backbone, you can get the attribute values using the get method.

person.get('Fname'); //will return the Fisrt name 
person.get(Age'); // will return Age value

Setter-

You can also update the attribute values using set method

person.set("FName", "Deepak"); // will update first name
person.set("Age", 30); //will update Age

You can also update the values in one go-

person .set({FName:’Deepak’,Age:30});

Deleting a Model-

You can delete the model using destroy function.

person.destroy();

Json Output-

Todoitem.toJSON()  //This will return all attributes of that object

Output on Browser Console-

Now launch the main.html page in browser and run the above commands, you will get the below outputs.

Dot Net World

Pages

Tuesday, September 15, 2015