AngularJS
AngularJS is a JavaScript-based open-source front-end web application framework mainly maintained by Google and by a community of individuals and corporations to address many of the challenges encountered in developing single-page applications. It is a library written in JavaScript.
It aims to simplify both the development and the testing of such applications by providing a framework for client-side model–view–controller (MVC) and model–view–view model (MVVM) architectures, along with components commonly used in rich Internet applications in effort to make both development and testing easier.
AngularJS is built on the belief that declarative programming should be used to create user interfaces and connect software components, while imperative programming is better suited to defining an application's business logic.
AngularJS's design goals include:
• To decouple DOM manipulation from application logic. The difficulty of this is dramatically affected by the way the code is structured.
• To decouple the client side of an application from the server side. This allows development work to progress in parallel, and allows for reuse of both sides.
• To provide structure for the journey of building an application: from designing the UI, through writing the business logic, to testing.
AngularJS was originally developed in 2009 by Miško Hevery at Brat Tech LLC as the software behind an online JSON storage service that would have been priced by the megabyte, for easy-to-make applications for the enterprise. This venture was located at the web domain "GetAngular.com", and had a few subscribers, before the two decided to abandon the business idea and release Angular as an open-source library.
AngularJS frees you from the following pains(Disadvantages):
• Registering callbacks: Registering callbacks clutters your code, making it hard to see the forest for the trees. Removing common boilerplate code such as callbacks is a good thing. It vastly reduces the amount of JavaScript coding you have to do, and it makes it easier to see what your application does.
• Manipulating HTML DOM programmatically: Manipulating HTML DOM is a cornerstone of AJAX applications, but it's cumbersome and error-prone. By declaratively describing how the UI should change as your application state changes, you are freed from low-level DOM manipulation tasks. Most applications written with AngularJS never have to programmatically manipulate the DOM, although you can if you want to.
•Marshaling data to and from the UI: CRUD operations make up the majority of AJAX applications' tasks. The flow of marshaling data from the server to an internal object to an HTML form, allowing users to modify the form, validating the form, displaying validation errors, returning to an internal model, and then back to the server, creates a lot of boilerplate code. AngularJS eliminates almost all of this boilerplate, leaving code that describes the overall flow of the application rather than all of the implementation details.
• Writing tons of initialization code just to get started: Typically you need to write a lot of plumbing just to get a basic "Hello World" AJAX app working. With AngularJS you can bootstrap your app easily using services, which are auto-injected into your application in a GUICE -like dependency-injection style. This allows you to get started developing features quickly. As a bonus, you get full control over the initialization process in automated tests.
It aims to simplify both the development and the testing of such applications by providing a framework for client-side model–view–controller (MVC) and model–view–view model (MVVM) architectures, along with components commonly used in rich Internet applications in effort to make both development and testing easier.
AngularJS is built on the belief that declarative programming should be used to create user interfaces and connect software components, while imperative programming is better suited to defining an application's business logic.
AngularJS's design goals include:
• To decouple DOM manipulation from application logic. The difficulty of this is dramatically affected by the way the code is structured.
• To decouple the client side of an application from the server side. This allows development work to progress in parallel, and allows for reuse of both sides.
• To provide structure for the journey of building an application: from designing the UI, through writing the business logic, to testing.
AngularJS was originally developed in 2009 by Miško Hevery at Brat Tech LLC as the software behind an online JSON storage service that would have been priced by the megabyte, for easy-to-make applications for the enterprise. This venture was located at the web domain "GetAngular.com", and had a few subscribers, before the two decided to abandon the business idea and release Angular as an open-source library.
AngularJS frees you from the following pains(Disadvantages):
• Registering callbacks: Registering callbacks clutters your code, making it hard to see the forest for the trees. Removing common boilerplate code such as callbacks is a good thing. It vastly reduces the amount of JavaScript coding you have to do, and it makes it easier to see what your application does.
• Manipulating HTML DOM programmatically: Manipulating HTML DOM is a cornerstone of AJAX applications, but it's cumbersome and error-prone. By declaratively describing how the UI should change as your application state changes, you are freed from low-level DOM manipulation tasks. Most applications written with AngularJS never have to programmatically manipulate the DOM, although you can if you want to.
•Marshaling data to and from the UI: CRUD operations make up the majority of AJAX applications' tasks. The flow of marshaling data from the server to an internal object to an HTML form, allowing users to modify the form, validating the form, displaying validation errors, returning to an internal model, and then back to the server, creates a lot of boilerplate code. AngularJS eliminates almost all of this boilerplate, leaving code that describes the overall flow of the application rather than all of the implementation details.
• Writing tons of initialization code just to get started: Typically you need to write a lot of plumbing just to get a basic "Hello World" AJAX app working. With AngularJS you can bootstrap your app easily using services, which are auto-injected into your application in a GUICE -like dependency-injection style. This allows you to get started developing features quickly. As a bonus, you get full control over the initialization process in automated tests.
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