Converts HTML into a Template Language
Unlike expressions, directives can be used for performing complex operations, and building large web applications. The programmers can use directives to structure web pages according to the available data. Also, they can use directives to extend HTML according to needs of individual web pages. The programmers also have option to use a variety of directives to accomplish common tasks. AngularJS allows developers to decide the elements to be displayed in each directive.
In addition to using directives of structure the views of a web application, the developers also have option to define the binding between content of the view and data in the scope. They can further use operations in the expressions and use specific directives to create bidirectional data binding. Each time the content of the view changes, the object in the scope is modified. Hence, AngularJS makes it easier for programmers to deliver updated and real-time information to users.
AngularJS further allows users to customize displaying of data on a web page through several mechanisms. The developers can use pre-built filters to display data in a web page in the most appropriate way. At the same time, they also have option to write custom filters to display data in the web page in a more compelling way.
AngularJS allows users to structure a web application through modules. They have option to create individual modules with controllers, filters, directives and service. Also, they can connect various modules and make them inter-dependent. Modules make it easier for users to convert the entire project into small and testable components which can be combined using dependency injection provided by the framework.
As noted earlier, AngularJS allows developers to divide the entire application into small modules, and combine the modules using dependency injection. While using dependency injection, the developers can use the config operation to retrieve specific elements of the application, and configure the element properly each time the module is loaded. AngularJS further allows developers to use dependency injection in a number of ways.
While using AngularJS, the developers can easily change the routes available in the web application using route providers. The option enables users to deliver the most relevant content and error messages to end users. They can create two distinct routes. One to deliver the appropriate content to authorized users, and the other to redirect to the error page. Also, the route providers make it easier for programmers to keep the web application structured and organized.
The developers can store all behaviours of the web application in controllers while using AngularJS. The controllers can communicate with views through special operators called $scope. $scope enables the controllers to provide the appropriate functions and objects to the view. Also, the programmers have option to manipulate the functions and objects provided by controllers through expressions and directives, along with specifying the scope of data provided to the view.
AngularJS allows programmers to create custom services, and inject these services into controllers seamlessly. The custom services can also be integrated with other services used by the web application. Likewise, the users can also define a public API which can be injected into the controllers, and used by other services. The feature makes it easier for developers to manipulate the functionality of third-party services used by the website.
The programmers can make the web application communicate with the restful server through two distinct services provided by AngularJS. They can use the connection using either $http or $resource. $http is designed as a small layer on top of XmlHttpRequest, whereas $resource supports higher level of abstraction. $resource further allows developers to make the application communicate with the restful server through custom actions. Hence, it becomes easier for programmer to effectuate the communication process by replacing POST and GET with custom actions.