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How to Use Class in TypeScript

By Nitin Bhardwaj on Oct 05, 2012
In this article I have described how to use classes in TypeScript with an example.
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Class in TypeScript

A ClassDeclaration declares a class instance type and a constructor function, both with the name given by Identifier, in the containing module. The class instance type is created from the instance members declared in the class body and the instance members inherited from the base class. The constructor function is created from the constructor declaration, the static member declarations in the class body, and the static members inherited from the base class. The constructor function initializes and returns an instance of the class instance type.

The following example shows how the Class can be used in TypeScript. The example prints "Hello C-sharpcorner user....!".

Coding

classdemo.ts

class Greeter {

       greeting: string;

       constructor (message: string) {

              this.greeting = message;

       }

       greet() {

              return"Hello, " + this.greeting;

       }

}  

var greeter = new Greeter("C-sharpcorner user.....!");

 

var button = document.createElement('button')

 

button.onclick = function() {

       alert(greeter.greet())

}

document.body.appendChild(button)

 

classdemo.html

<html>

   <head>

   </head>

   <body>

       <h1>TypeScript Class Example</h1>

   <script>var Greeter = (function () {

    function Greeter(message) {

        this.greeting = message;

    }

    Greeter.prototype.greet = function () {

        return"Hello, " + this.greeting;

    };

    return Greeter;

    })();

       var greeter = new Greeter("C-sharpcorner user.....!");

       var button = document.createElement('button');

       button.textContent = "Click On Me";

     

       button.onclick = function () {

           alert(greeter.greet());

       };

       document.body.appendChild(button);

    </script>

  </body>

</html>

 

app.js

var Greeter = (function () {

    function Greeter(message) {

        this.greeting = message;

    }

    Greeter.prototype.greet = function () {

        return"Hello, " + this.greeting;

    };

    return Greeter;

})();

var greeter = new Greeter("C-sharpcorner user.....!");

var button = document.createElement('button');

button.onclick = function () {

    alert(greeter.greet());

};

document.body.appendChild(button);

 

Output

 

class-type-script.gif

Reference By

http://www.typescriptlang.org/

Nitin Bhardwaj

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