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17 February, 2020

What is an AngularJS and its advantages and disadvantages?

What is an AngularJS and its advantages and disadvantages?

 

AngularJS is an JavaScript model-view-controller (MVC)

framework that makes it easy to build applications rapidly that run well on any platform. In a very short period of time, AngularJS becomes well known framework offering one of the most widely used framworks. Angular js is well known JavaScript client-side frameworks. AngularJS is greater combined with jQuery and Twitter Bootstrap give you everything you need to rapidly build HTML5 JavaScript application frontends that use REST web services for the backend processes.

AngularJS is an opensource JavaScript framework developed by Google basically used to create web apps and It is free of cost. It is an excellent framework for building single page applications.

JavaScript Client-Side Frameworks


JavaScript client-side applications run on the user’s device or PC, and therefore shift the workload to the user’s hardware and away from the server. Until fairly recently, serverside web MVC frameworks like Struts, Spring MVC, and ASP.NET were the frameworks of choice for most web-based software development projects. JavaScript client-side frameworks, however, are sustainable models that offer many advantages over conventional web frameworks, such as simplicity, rapid development, speed of operation, testability, and the ability to package the entire application and deploy it to all mobile devices and the Web with relative ease. You can build your application one time and deploy and run it anywhere, on any platform, with no modifications. That’s powerful.

Single-Page Applications AngularJS is most often used to build applications that conform to the single-page application (SPA) concept. SPAs are applications that have one entry point HTML page; all the application content is dynamically added to and removed from that one page. You can see the entry point of our SPA in the index.html code that follows. The tag
 
is where all dynamic content is inserted into index.html:
 
<body>

<div ng-view></div>

<body>
As the user clicks on links in the application, existing content attached to the tag is removed and new dynamic content is then attached to the same tag. Rather than the user waiting for a new page to load, new content is dynamically displayed in a fraction of the time that it would take to load a new HTML web page.

Dependency Injection


Dependency injection (DI) is a design pattern where dependencies are defined in an application as part of the configuration. Dependency injection helps you avoid having to manually create application dependencies.
AngularJS uses dependency injection to load module dependencies when an application first starts. The app.js code in the previous section shows how AngularJS dependencies are defined.
As you can see, two dependencies are defined as needed by the helloWorldApp application at startup. The dependencies are defined in an array in the module definition. The first dependency is the AngularJS ngRoute module, which provides routing to the application.
The second dependency is our controller module, helloWorldControllers. We will cover controllers in depth later, but for now just understand that controllers are needed by our applications at startup time.

Dependency injection is not a new concept. It was introduced over 10 years ago and has been used consistently in various application frameworks; DI was at the core of the popular Spring framework written in Java.
One of its main advantages is that it reduces the need for boilerplate code, writing of which would normally be a time-consuming process for a development team.
Dependency injection also helps to make an application more testable. That is one of the main advantages of using AngularJS to build JavaScript applications. AngularJS applications are much easier to test than applications written with most JavaScript frameworks. In fact, there is a test framework that has been specifically written to make testing AngularJS applications easy.

AngularJS Views (MVC)


Many JavaScript client-side frameworks require you to actually define the view classes in JavaScript, and they can contain anywhere from a few to hundreds of lines of code.
Such is not the case with AngularJS. AngularJS pulls in all the templates defined for an application and builds the views in the document object model (DOM) for you.
Therefore, the only work you need to do to build the views is to create the templates. Building views in AngularJS is a simple process that uses mostly HTML and CSS. The simplicity of AngularJS views is a huge time-saver when you’re building AngularJS applications.

AngularJS Models (MVC)


Many JavaScript client-side frameworks also require you to create JavaScript model classes. That is also not the case with AngularJS. AngularJS has a $scope object that is used to store the application model.
Scopes are attached to the DOM. The way to access the model is by using data properties assigned to the $scope object.
The AngularJS $scope helps to simplify JavaScript applications considerably. Other JavaScript frameworks often encourage placing large amounts of business logic inside the model classes for the particular framework. Unfortunately, that practice often leads to duplicated business logic. In a large project, that can lead to thousands of lines of useless code. 


AngularJS Controllers (MVC)


AngularJS controllers are the tape that holds the models and views together. The controller is where you should place all business logic specific to a particular view when it’s not possible to place the logic inside a REST service. Business logic should almost always be placed in backend REST services whenever possible; this helps to simplify AngularJS applications.
When business logic placed inside an application is used by multiple controllers, it should be placed in AngularJS non-REST services instead. Those services can then be injected into any controller that needs access to the logic.

Here we are discusing all about angularjs advantages and disadvantages.

Advantages Of Angular Js

There are a plethora of JavaScript frameworks for building web applications. But the genuine question rises, why to use Angular JS.

Here some advantages of AngularJS over other JavaScript frameworks:

  1. Developed By GOOGLE: AngularJS framework is maintained and developed by Google. Google takes care of every version of AngularJS.
  2. Global community support: Global community support is one of the factors, that can easily make Angular the best javascript framework. Developers and designers constantly collaborate and contribute to the community, increasing credibility and reliability of the framework.
  3. full-fledged framework: It is a full-fledged framework that can run in any browser or platform. Moreover, it is consistent, overwhelmed with ready-made tools, ng components are robust and quite mature, as contrasted with React.
  4. Angular-language-service — which allows intelligence and autocomplete inside of component external HTML template files.
  5. Unit Testing Ready: AngularJS framework is a unit testing ready framework that is its most compelling advantages.
  6. Two-way data bind: Two-way data bind is probably the top feature, as it diffuses the impact after every minor data change and does way with the need for further effort with data sync in view and model.
  7. TypeScript: Angular’s created to be used alongside with Typescript. And has exceptional support for it. TypeScript is an enhanced JS super-set that supplies optional static type checking, object-based programming patterns, and high-performance typing features.
  8. Component-based architecture: Owing to component-based architecture components have deep binding and each of them comprises elements with only relevant functionality. What is more, they are loosely coupled and properly encapsulated. Such approach makes components easily reusable, enhance their testability and further maintainability.
  9. Structure and architecture specifically created for great project scalability.

Apart from the list, there are a variety of other advantages that make the Angular JS framework much popular.

Disadvantages of Angular JS

Here’s a compilation of some of the drawbacks of using Angular JS. These are the basic disadvantages of Angular JS.

  1. Variety of different structures(Injectables, Components, Pipes, Modules etc.) makes it a bit harder to learn in comparison with React and Vue.js, which have an only “Component” in mind.
  2. Relatively slower performance, according to different benchmarks. On the other hand, it can be easily tackled by utilizing so-called “Change Detection Strategy”, which helps to control the rendering process of components manually.
  3. steep learning curve and complexity: Despite a comprehensive and clear manual, steep learning curve and complexity are named among the main weak points of Angular.js. Like any other client-side rendering technology in javascript framework comparison list, programmers should place special emphasis on security to make apps reliable and safe. Though, with introduction of Angular Universal and pre-rendering option in ng2 this issue was defused.
  4. Confusion: with Angular JS there are many ways to do the same thing. Sometimes, it is be hard to find the right way for a task. Hence, it is essential for programmers to understand all components of it.
  5. Name Clashes: you don’t have the ability to formulate many ng-apps on the same page With Angular JS. This creates name clashes.

Reason to choose Angular JS

Here are again some point , that might catch your interest to Choose AngularJ S:

  • Quick Started: Angular JS is too easy and simple to start. All you only need to add few attributes to your HTML code, and you can create your first, small Angular app in a few minutes.
  • Time-Saving: Angular JS is MVC. so you can split your code into MVC components. It will definitely save your time and efficiency of your project.
  • Declarative Expression of UI
  • Data Binding is Easy

 

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