What is AngularJS? 

AngularJS is an open source web application framework. It was originally developed in 2009 by Misko Hevery and Adam Abrons.

Features

• AngularJS is a powerful JavaScript based development framework to create RICH Internet Application(RIA).
• AngularJS provides developers options to write client side application (using JavaScript) in a clean MVC(Model View Controller) way.
• Application written in AngularJS is cross-browser compliant. AngularJS automatically handles JavaScript code suitable for each browser.
• AngularJS is open source, completely free, and used by thousands of developers around the world. It is licensed under the Apache License version 2.0.

Core Features

Following are most important core features of AngularJS −

• Data-binding − It is the automatic synchronization of data between model and view components.
• Scope − These are objects that refer to the model. They act as a glue between controller and view.
• Controller − These are JavaScript functions that are bound to a particular scope.

Advantages of AngularJS

• AngularJS provides capability to create Single Page Application in a very clean and maintainable way.
• AngularJS provides data binding capability to HTML thus giving user a rich and responsive experience
• AngularJS code is unit testable.
• AngularJS uses dependency injection and make use of separation of concerns.
• AngularJS provides reusable components.
• With AngularJS, developer write less code and get more functionality.
• In AngularJS, views are pure html pages, and controllers written in JavaScript do the business processing.

Disadvantages of AngularJS

Though AngularJS comes with lots of plus points but same time we should consider the following points −

• Not Secure − Being JavaScript only framework, application written in AngularJS are not safe. Server side authentication and authorization is must to keep an application secure.
• Not degradable − If your application user disables JavaScript then user will just see the basic page and nothing more.

• The AngularJS Components

  The AngularJS framework can be divided into following three major parts −
• ng-app − This directive defines and links an AngularJS application to HTML.
• ng-model − This directive binds the values of AngularJS application data to HTML input controls.
• ng-bind − This directive binds the AngularJS Application data to HTML tags.

Example

Now let us write a simple example using AngularJS library. Let us create an HTML file myfirstexample.html as below −

Example
Now let us write a simple example using AngularJS library. Let us create an HTML file myfirstexample.html as below −

<!doctype html>
<html>
   
   <head>
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.5.2/angular.min.js"></script>
   </head>
   
   <body ng-app = "myapp">
      
      <div ng-controller = "HelloController" >
         <h2>Welcome {{helloTo.title}} to the world of TuringCoding!</h2>
      </div>
      
      <script>
         angular.module("myapp", [])
         
         .controller("HelloController", function($scope) {
            $scope.helloTo = {};
            $scope.helloTo.title = "AngularJS";
         });
      </script>
      
   </body>
</html>