AngularJS Framework
AngularJS is an open source Model-view-Controller framework which also is similar to the JavaScript framework. AngularJS is a structural framework for dynamic web apps. However, AngularJS is possibly one of the most popular modern day web frameworks available today. But, this framework is used for developing mostly Single Page applications. So What is angularjs then, let’s see.
AngularJS is a JavaScript Framework
<script src=”https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js”></script>
AngularJS can be added to an HTML page with a <script> tag. So it lets you use HTML as your template language and lets you extend HTML’s syntax to express your application’s components clear and brief.
- AngularJS extends HTML with ng-directives.
- The ng-app directive defines an AngularJS application.
- The ng-model directive binds the value of HTML controls (input, select, textarea) to application data.
- The ng-bind directive binds application data to the HTML view.
<!DOCTYPE html>
<html>
<script src=”https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js”></script>
<body><div ng-app=””>
<p>Name: <input type=”text” ng-model=”name”></p>
<p ng-bind=”name”></p>
</div></body>
</html>
AngularJS keeps the data and presentation later in sync. So Now you don’t need to write an additional JavaScript code to keep the data in your HTML code and your data later in sync. Because AngularJS will automatically do this for you. And Just you need to specify which control is bound to which part of your model.
AngularJS is what HTML would have been designed for applications. HTML is a great declarative language for static documents. But, It does not contain much in the way of creating applications.
The struggle between dynamic applications and static documents is frequently solved with:
- A library – When writing web apps, a collection of functions which are useful. Though Your code is in indicted and calls into the library when fits.
- Frameworks– a particular implementation of a web application, where your code fills in the details. The framework is in indict and calls into your code when it needs something app specific.
AngularJS takes another advance steps to reduce the struggle between document-centric HTML and what an application needs by creating HTML constructs where AngularJS teaches the browser new syntax through a construct we call directives.
AngularJS Directives
AngularJS directives are HTML attributes with an ng prefix.
The ng-init directive initializes AngularJS application variables.
<div ng-app=”” ng-init=”firstName=’John'”>
<p>The name is <span ng-bind=”firstName”></span></p>
</div>
Useful Resource: W3Schools
AngularJS Examples include:
- Data binding, as in {{}}.
- DOM (Document Object Model) control structures for repeating, showing and hiding DOM fragments.
- Support for forms and form validation.
- Attaching new behavior to DOM elements, such as DOM event handling.
- Grouping of HTML into reusable components.
A complete client-side solution
AngularJS is a completely client-side solution that presents a higher level of abstraction for developers that is fit for CRUD (Create, Read, Update, and Delete) apps. Also handles all of the DOM and AJAX glue code you once wrote by hand and then puts it in a well-defined structure. AngularJS probably might not be fit for apps (like games and GUI editors) that require intensive and also tricky DOM manipulation. In that case, it’s better to use a library with a lower level of abstraction.
Concepts in AngularJS
AngularJS comes up with many powerful features and concepts.
So which are things you need to build a CRUD app?
- To build a CRUD app in an organized set: Data-binding, basic templating directives, form validation, routing, deep-linking, reusable components, and dependency injection.
- Angular supports testing, both Unit testing, and Integration Testing.
- Start application with directory layout and test scripts as a starting point.
AngularJS makes things easier using a higher level of abstraction to the developer for application development. Similar to any abstraction, it comes at a cost of flexibility. Which means, not every built app is for AngularJS. CRUD applications signify the majority of web applications.
Games and GUI editors are examples of applications with intensive and tricky DOM manipulation. These sorts of applications are not quite the same as CRUD applications, and thus are most likely not a solid match for AngularJS. In these cases, that might be smarter to utilize a library with a lower dimension of deliberation, for example, jQuery.
Advantages of using AngularJS for App Development
AngularJS is worked around the belief that declarative code is superior to anything basic with regards to building UIs and wiring software components together, while the basic code is superb for communicating business logic.
- AngularJS is a smart thought to decouple DOM control from app logic. And also significantly enhances the testability of the code.
- An extremely smart thought to view application testing as equivalent in significance to application composing, the angular JS. Testing trouble is significantly influenced by the manner in which the code is organized.
- It is a superb plan to decouple the client side of an app from the server side. This permits improvement work to advance in parallel and takes into consideration the reuse of the two sides.
- An exceptionally useful for sure if the structure guides engineers through the whole adventure of building an application: From planning the UI, through composition the business logic, to testing.
- In every case, it’s great to make basic tasks inconsequential and difficult tasks possible.
AngularJS frees you from the following pains:
Registering callbacks:
AngularJS is a good thing for removing common boilerplate code such as callbacks. And vastly reduces the amount of JavaScript coding, which makes easier to see what your application does.
Manipulating HTML DOM programmatically:
Controlling HTML DOM is a foundation of AJAX applications, however, it’s awkward and blunders inclined. By decisively portraying how the UI should change as your application state transforms, you are free from low-level DOM control undertakings. Most applications composed with AngularJS never need to automatically control the DOM, in spite of the fact that you can if you need to.
Marshaling data to and from the UI:
CRUD operations make up the majority of AJAX application tasks. The flow of collecting data from the server to an internal object to an HTML form, and letting clients alter the form, approving the form, showing approval errors, coming back to an inner model, then back to the server, makes a great deal of standard code. AngularJS takes out practically the majority of this standard, leaving code that describes the general stream of the application as opposed to the majority of the execution details.
Just to get started writing much of initialization code:
Typically you have to write a lot of code just to get a basic “Hello World” AJAX app working. With AngularJS you can bootstrap your application effectively utilizing administrations, which are auto-injected into your application in a Guice-like dependency infusion style. This enables you to begin creating highlights rapidly. As a reward, you deal with the introduction procedure in robotized tests.
Why AngularJS?
HTML confines when we endeavor to use for proclaiming dynamic perspectives in web-applications. So for your application, AngularJS gives you a chance to broaden HTML vocabulary. The subsequent area is strikingly expressive, decipherable, and speedy to create.
Recent Comments