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Understanding Of The Angularjs Benefits For Creating Impressive Single Page Application

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By Author: Kaushik
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AngularJS is the structural open-source framework suitable for creating dynamic web page applications. It helps the developer to use the HTML tags as the template language and extends the HTML syntax to give the components for the application clearly and effectively. It is the best javascript framework to create rich internet applications with features like MVC, Cross-Browser, Two-way binding approach, and so on.

It is important to understand how to apply the benefits of AngularJS in our SPAs to make it impressive and interactive. Here, we have clear insights to make use of the AngularJS features for our applications.

Five ‘D’ Benefits of AngularJS
Before go to the practical implementation, let us go through the main five benefits of AngularJS.
Data Binding
Data Binding in AngularJS is one of the main and greatest benefits of AngularJS. AngularJS has two-way data binding that the automatic synchronization of data between the model and view components done with the single-source. It is used to structure the information model and associate the schemata to help every data to be stored exactly one time. With the Two-Way data binding, the data element does not need to be updated manually to the entire system. It simplifies the programming model, testable of the controller easily, reducing the boilerplate codes to keep the model clean and understandable.

Directives are the attributes that represent the reusable components. AngularJS has a wide range of built-in directives like ngClass, ngModel, and ngBind, and so on. It is used to command the HTML compiler to attach the particular behavior to the selected element which is used later for transforming the DOM elements. Developers are only to assign the attributes to elements for getting the required functionality.

Declarative User Interface
HTML Templating has been effectively used by AngularJS for easy reorganization. It consists of directives, markup, filter, and form controls as elements and attributes that add clarity to the User Interface. Declarative UI makes the developers understand and manipulate UI easily and effectively. Markup helps the beginner to program without many efforts. The declarative syntax used to bind different UI components with data models that the designer can create their UI independently. It helps in reducing the side-effects that pop out when changing something by decoupling the dependency in the presentation of the application.

Dependency Injection
AngularJS has an effective dependency injection that allocates an instance variable to a particular object. It is a simplified software design pattern that converts the way for holding its dependencies by the components. Dependency Injection makes easy for developing, testing, and understanding the application by creating components, resolving the dependencies, and supplying the required components to the developers in their need.

DOM Components
DOM (Document Object Model) is the greatest benefit of AngularJS that extends the directive vocabulary for the developers and create own directives for their use. It makes the designers focus on the view to present effective application by its easy to understand the abstraction of DOM manipulations along with its behavior. AngularJS doesn’t manipulate the templates as strings that will be parsed by the browser into the DOM.

Practical Implementation of AngularJS Benefits
Now, we create practical application with AngularJS, therewith, let us start from creating a module. Module is the container for all the parts of our application such as controllers, service, and so on.
  var app = angular.module(‘DemoApp’ [])
Now, define a simple controller in our DemoApp
  app.controller(‘SLAController’, function($scope)
  $scope.message = “Greetings from SLAController”;
  } );
Now, we implement in our HTML codes
First we need to add angular script and DemoApp with the specifications of our module in ng-app attribute and ng-controller attribute.

As we create Single Page Application, we can use AngularJS routing capabilities without refreshing the page.
ngRoute module provides routing, deeplinking services and directives for our angularjs application.

Now, specify our module that depends on ngRoute
  var app = angular.module('DemoApp', ['ngRoute']);
Now differentiate common HTML for all pages as this HTML will be layout of the website using ng-view directive.

Now configure the routes using $routeProvider service from ngRoute module by specify the templateURL and Controller with “/” operator for route.

  var app = angular.module('myApp', ['ngRoute']);
  { $routeProvider
  { templateUrl : 'pages/home.html',
  controller : 'SLAController' })
  { templateUrl : 'pages/blog.html',
  controller : 'BlogController' })
  { templateUrl : 'pages/about.html',
  controller : 'ContactController' })
  .otherwise({redirectTo: '/'});
Now create controllers for every route
  app.controller('SLAController', function($scope)
  { $scope.message = 'Hello from HomeController'; });
  app.controller('BlogController', function($scope)
  {$scope.message = 'Hello from BlogController'; });
  app.controller('ContactController', function($scope)
  { $scope.message = 'Hello from AboutController'; });

The final HTML will be done as below after the links added to switch over the pages


End Note
I hope this would be useful for implementing your first app using AngularJS in HTML with its benefits. Learn more at SLA Institute for comprehensive AngularJS Training in Chennai.

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