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What is angularJs?
AngularJS is a JavaScript framework. It can be added to an HTML page with a <script> tag. AngularJS extends HTML attributes with Directives, and binds data to HTML with Expressions.AngularJS is perfect for Single Page Applications (SPAs) and is easy to learn.
AngularJs was originally developed in 2008-2009 by Misko hevery and Adam abrons,and is now maintained by google.
Why AngularJS?
HTML is great for declaring static documents, but it falters when we try to use it for declaring dynamic views in web-applications. AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Key Features:
Model View Controller(MVC): An architecture that is basically a software pattern used to develop an application. It consists of three components in general,
they are:
Model: used to manage the application data.
View: responsible for displaying the application data.
Controller: main job is to connect the model and the view component.
Feature of AngularJs
DEVELOP ACROSS ALL PLATFORMS: Build applications with Angular and reuse your code and abilities to build apps for any deployment target. For web, mobile web, native mobile and native desktop.
SPEED & PERFORMANCE: Achieve the maximum speed possible on the Web Platform today, and take it further, via Web Workers and server-side rendering. Angular puts you in control over scalability. Meet huge data requirements by building data models on RxJS, Immutable.js or another push-model.
INCREDIBLE TOOLING: Build features quickly with simple, declarative templates. Extend the template language with your own components and use a wide array of existing components. Get immediate Angular-specific help and feedback with nearly every IDE and editor. All this comes together so you can focus on building amazing apps rather than trying to make the code work.
LOVED BY MILLIONS: From prototype through global deployment, Angular delivers the productivity and scalable infrastructure that supports Google's largest applications.
AngularJS Vs. Angular 2 Vs. Angular 4
Understanding the Different Versions of Angular
Before we dive into the differences, let’s first clarify each version with a description:
AngularJS is an open-source, JavaScript-based, front-end web application framework for dynamic web app development. It utilizes HTML as a template language. By extending HTML attributes with directives and binding data to HTML with expressions, AngularJS creates an environment that is readable, extraordinarily expressive and quick to develop. Angular is the blanket term used to refer to Angular 2, Angular 4 and all other versions that come after AngularJS.
Both Angular 2 and 4 are open-source, TypeScript-based front-end web application platforms. Angular 4 is the latest version of Angular. Although Angular 2 was a complete rewrite of AngularJS, there are no major differences between Angular 2 and Angular 4. Angular 4 is only an improvement and is backward compatible with Angular 2.
How Are They Different?
Below is a comparison of AngularJS to Angular, because Angular includes both version 2 and version 4.
We compare architecture, language, expression syntax, mobile support, and routing.
1. Architecture
AngularJS: The architecture of AngularJS is based on model-view-controller (MVC) design. The model is the central component that expresses the application's behavior and manages its data, logic, and rules. The view generates an output based on the information in the model. The controller accepts input, converts it into commands and sends the commands to the model and the view.
Angular: In Angular 2, controllers and $scope were replaced by components and directives. Components are directives with a template. They deal with a view of the application and logic on the page. There are two kinds of directives in Angular 2. These are structural directives that alter the layout of the DOM by removing and replacing its elements, and attributive directives that change the behavior or appearance of a DOM element.
In Angular 4, the structural derivatives ngIf and ngFor have been improved, and you can use if/else design syntax in your templates.
2. Language
AngularJS: AngularJS is written in JavaScript.
Angular: Angular uses Microsoft’s TypeScript language, which is a superset of ECMAScript 6 (ES6). This has the combined advantages of the TypeScript features, like type declarations, and the benefits of ES6, like iterators and lambdas.
Angular 4 is compatible with the most recent versions of TypeScript that have powerful type checking and object-oriented features.
3. Expression Syntax
AngularJS: To bind an image/property or an event with AngularJS, you have to remember the right ng directive.
Angular: Angular focuses on “( )” for event binding and “[ ]” for property binding.
4. Mobile Support
AngularJS was not built with mobile support in mind, but Angular 2 and 4 both feature mobile support.
5. Routing
AngularJS uses $routeprovider.when() to configure routing while Angular uses @RouteConfig{(…)}.
Performance
AngularJS was originally developed for designers, not developers. Although there were a few evolutionary improvements in its design, they were not enough to fulfill developer requirements. The later versions, Angular 2 and Angular 4, have been upgraded to provide an overall improvement in performance, especially in speed and dependency injection.
1. Speed: By providing features like 2-way binding, AngularJS reduced the development effort and time. However, by creating more processing on the client side, page load was taking considerable time. Angular2 provides a better structure to more easily create and maintain big applications and a better change detection mechanism. Angular 4 is the fastest version yet.
2. Dependency injection: Angular implements unidirectional tree-based change detection and uses Hierarchical Dependency Injection system. This significantly boosts performance for the framework.
Advantages and Disadvantages
Because they are Google products, all Angular versions are trustworthy and enjoy great support from Google engineers and the large community of Angular users and developers. However, each version has its own advantages and disadvantages.
1. AngularJS
Advantages: It is unit testing ready.It has great MVC data binding makes app development fast.Using HTML as a declarative language makes it very intuitive.It is a comprehensive solution for rapid front-end development since it does not need any other frameworks or plugins.AngularJS apps can run on every significant program and advanced cells including iOS and Android-based phones and tablets.
Disadvantages: It is big and complicated due to the multiple ways of doing the same thing.Implementations scale poorly.If a user of an AngularJS application disables JavaScript, nothing but the basic page is visible.There’s a lagging UI if there are more than 200 watchers.
2. Angular 2
Advantages: TypeScript allows code optimization using the OOPS concept.It is mobile-oriented.It has improved dependency injection and modularity.It provides more choice for languages such as Dart, TypeScript, ES5, and ES6 for writing codes.It offers simpler routing.
Disadvantages: It is more complicated to set up compared to AngularJS.It’s inefficient if you only need to create simple, small web apps.
3. Angular 4
Advantages: It enables a fast development process.It’s ideal for single-page web applications with an extended interface.Full TypeScript support helps in building bulky applications.Tests are easy to write.An improved View Engine generates less code in AOT mode.It has a modularized animation package.
Disadvantages: It’s slow when displaying enormous amounts of data.
We also provide MEAN(MongoDB , ExpressJS, AngularJS, NodeJS) stack developer.
How to Start with AngularJS
Example 1:
<!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 starts automatically when the web page has loaded.
The ng-app directive tells AngularJS that the <div> element is the "owner" of an AngularJS application.
The ng-model directive binds the value of the input field to the application variable name.
The ng-bind directive binds the content of the <p> element to the application variable name.
AngularJs Control
Data Binding
Data-binding is an automatic way of updating the view whenever the model changes, as well as updating the model whenever the view changes. This is awesome because it eliminates DOM manipulation from the list of things you have to worry about.
Controller
Controllers are the behavior behind the DOM elements. AngularJS lets you express the behavior in a clean readable form without the usual boilerplate of updating the DOM, registering callbacks or watching model changes.
Plain JavaScript
Unlike other frameworks, there is no need to inherit from proprietary types in order to wrap the model in accessors methods. AngularJS models are plain old JavaScript objects. This makes your code easy to test, maintain, reuse, and again free from boilerplate.
AngularJs Components
Directives
Directives are a unique and powerful feature available in AngularJS. Directives let you invent new HTML syntax, specific to your application.
Reusable Components
We use directives to create reusable components. A component allows you to hide complex DOM structure, CSS, and behavior. This lets you focus either on what the application does or how the application looks separately.
Localization
An important part of serious apps is localization. AngularJS's locale aware filters and stemming directives give you building blocks to make your application available in all locales.
Navigation, Forms and Backends
Deep Linking
A deep link reflects where the user is in the app. This is useful so users can bookmark and email links to locations within the app. Round trip apps get this automatically, but AJAX apps by their nature do not. AngularJS combines the benefits of deep linking with desktop app-like behavior.
Form Validation
Client-side form validation is an important part of a great user experience. AngularJS lets you declare the validation rules of the form without having to write JavaScript code. Write less code, go have beer sooner.
Server Communication
AngularJS provides built-in services on top of XHR as well as various other backends using third party libraries. Promises further simplify your code by handling asynchronous return of data.
Testability Built-in
Injectable
The dependency injection in AngularJS allows you to declaratively describe how your application is wired. This means that your application needs no main() method which is usually an unmaintainable mess. Dependency injection is also a core to AngularJS. This means that any component which does not fit your needs can easily be replaced.
Testable
AngularJS was designed from ground up to be testable. It encourages behavior-view separation, comes pre-bundled with mocks, and takes full advantage of dependency injection. It also comes with end-to-end scenario runner which eliminates test flakiness by understanding the inner workings of AngularJS.
Design custom architecture.
We can work on SOA(service oriented architecture ) & micro-service based architecture.
integrate payment gateways.I can connect nodejs with Mongodb.
integrate any third party APIS (SOAP/REST).
work on express.js and latest koa.jsI can also work on angular 1.x,2.x,4.x
bootstrap, foundation and if required, we can develop our own CSS/JS.
Make the responsive website with angular/native HTML as per design.
Integrate continues integration like Travis-CI and JENKINS.
Write mocha.js TDD and BDD both scripts for automated unit testing.
Manage server (AWS Only).
Make the replica of MongoDB and loadbalance,
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