HTML is very good for announcing static files, but it falters when we try to use it for declaring dynamic perspectives in web-applications. AngularJS enables you to expand HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Alternatives Neither of these address the main issue that HTML wasn’t designed for dynamic viewpoints.
What is Angular used for?
- Extensibility
AngularJS is a toolset for building the frame most suited to your application development. It is fully extensible and works well with other libraries. Each feature can be modified or replaced to suit your distinctive development workflow and attribute requirements. Keep Reading to find out how.
- Add Some Control
- Data Binding
Data-binding is an automated method of upgrading the perspective whenever the version changes, in addition to upgrading the version whenever the view varies. This is amazing since it removes DOM manipulation by the list of items you need to worry about.
Controller
Controllers would be the behavior behind the DOM components. AngularJS lets you express the behaviour in a clean readable form without the typical boilerplate of updating the DOM, registering callbacks or viewing model changes.
Unlike other frameworks, there’s absolutely no need to inherit from proprietary forms to be able to wrap the version in accessors methods. AngularJS versions are plain old JavaScript items. This makes your code easy to check, maintain, reuse, and again free from boilerplate.
A profound link reflects where the consumer is in the app. This is useful so users can email and bookmark links to locations within the app. Round trip apps get this automatically, but AJAX programs by their nature don’t. AngularJS combines the benefits of deep linking together with background app-like behavior.
- Form Validation
Client-side form validation is an significant part a fantastic user experience. AngularJS allows you to announce the validation rules of the form without needing to write JavaScript code.
- Server Communication
AngularJS provides built-in services in addition to XHR in addition to various different backends using third party libraries.
- Create Components
Directives Directives let you devise new HTML syntax, specific to your application.
Reusable Components Then jQuery came along, enhanced the API by enabling you to use CSS selectors, also made it a lot easier to develop cross-browser web applications.
This was a great step forward, and programmers were able to become more effective. Nevertheless this still does not solve the root problem that software built as a series of DOM manipulations and callbacks are hard to organise and preserve.
More recently, took the stage, offering excellent utilities and helpful tips about how to organise code. This certainly assisted internet developers building bigger applications recover some of their sanity. However, as far as is a fantastic step in the perfect direction, it doesn’t go far enough concerning making developers more productive. While the application is more organised, you still devote a good deal of time composing critical code to manage the state between perspectives and models.
The GitHub Contributors program, ported from YUI 3.5 into AngularJS, lets you browse contributors of GitHub jobs
AngularJS is different from other frameworks as it facilitates composing your code declaratively, preventing tedious DOM manipulation and event listeners. For most cases, instead of composing a great deal of code to traverse the DOM, you only wish to maintain some combination of elements and attributes synchronised having an object on your application’s business logic. To try it, AngularJS provides a few of ‘directives’ to assist write programs far more rapidly.
Allowed, there’ll be instances when you wish to have the ability to listen to, or even do, some customized manipulation. AngularJS allows you to compose directives that act as an interface between critical listeners and DOM API calls, and also the declarative data binding that you would like to use to write the business logic of your application.
The Key features of AngularJS
To add event handling, our JavaScript might look something like this:
Document.findElementById(‘buybutton’)addEventListener(‘click’, function(event) // The button with the id of buybutton // has been clicked );
While powerful for simple applications, this technique can prove to be troublesome in more complex programs. Even with this simple example, there’s a tight coupling between the document structure along with the JavaScript. That is, the element with the buybutton id tag must not change.
When designing changes, or the title or DOM structure of this button changes, our fragile JavaScript is likely to stop functioning.
Angular, on the other hand, declaratively integrates interactivity alongside the element description. We could rewrite the preceding case within the HTML file:
Rather than seeing ourselves with how the element is located in the webpage we can let Angular worry about attaching events to the elements while we determine the business logic of the application. It frees us programmers from worrying about the work necessary to apply the JavaScript, and build our program. The confusion of how elements work is shrunk significantly as the interactivity is written to the web application.
Rather than building upon the DOM, we could build upon our application’s data
As the disposition of embedding interactivity to our HTML declaratively defines the aim of this DOM element, Angular changes how we teach web development. Instead of building upon the DOM, we build upon our application’s data. Rather than studying on how the browser works and what CSS selectors are, we concentrate upon expanding knowledge of the functionality of this application.
