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Table of Contents
What is the AngularJS?
AngularJS is an open-source Model-View-Controller framework that is similar to the JavaScript framework.
It was originally developed in 2009 by Misko Hevery and Adam Abrons
AngularJS is a very powerful JavaScript Framework. It is used in Single Page Application (SPA) projects.
AngularJS provides developers an option to write client-side applications using JavaScript in a clean Model View Controller (MVC) way.
It is a continuously growing and expanding framework which provides better ways for developing web applications.
AngularJS was originally started as a project in Google but now, it is an open-source framework.
It changes the static HTML to dynamic HTML.
Introduction to the directory structure of AngularJS
e2e - It contains the code related to automated testing purpose. For example, if on a certain page you are calling a REST API then what should be the return status code, whether it is acceptable or not etc.
node_modules - It saves all the dev dependencies. When any new dependency when added to project it is automatically saved to this folder.
src - This directory contains all of your work related to project i.e. creating components, creating services, adding CSS to the respective page, etc.
package.json - This file stores the information about the libraries added and used in the project with their specified version installed. Whenever a new library is added to the project it’s name and version is added to the dependencies in this file.
Other files - These all are used for editor configurations and information needed at compile time. The builtin webpack in angular CLI manages all for you.
Inside src folder:
index.html - This is the entry point for the application, app-root tag is the entry point of the application on this single page application, on this page angular will add or remove the content from the DOM or will add new content to the DOM.
style.scss - This file is the global stylesheet you can add that CSS classes or selectors which are common to many components, for example, you can add custom fonts, add bootstrap.css, etc.
assets - It contains the JS, Images, Fonts, Icons and many other files for project.
Inside app folder
app.module.ts - An angular project is composite of so many other modules in order to create an application you have to create a root module for your application in the hierarchy. This app.module.ts file is that. If you want to add more modules at the root level, you can add
declarations - It is the reference of the array to store its components. The app component is the default component that is generated when a project is created.
imports - If you want to add any module whether angular or you have to add it to imports array to make them available in the whole project.
providers - If you will create any service for your application then you will inject it into your project through this provider array.
bootstrap - This has reference to the default component created, i.e., AppComponent
app.component.html - Edit this file to make changes to the page. You can edit this file as an HTML file. Work directly with div or any other tag used inside body tags.
app.component.spec.ts - These are automatically generated files which contain unit tests for source component.
app.component.ts - You can do the processing of the HTML structure in the .ts file. The processing will include activities such as connecting to the database, interacting with other components, routing, services, etc.
app.component.scss - Here you can add CSS for your component. You can write scss which further compiled to CSS by a transpiler.
Advantages of AngularJS
Angularjs is an open source JavaScript MVC framework, therefore, at affordable costs custom application can be available to anyone.
AngularJs framework is supported by a large community, Google
The Angular JS application is bound with the help of Dependency Injection (DI). DI is basically a design pattern that discusses the components and their dependencies.
People with knowledge of HTML, JavaScript and CSS can easily learn AngularJS. Learning AngularJS opens-up more opportunities for developers in the Web Development industry
The AngularJS framework creates templates using HTML. Templates include AngularJS specific elements and attributes such as filters, directives such as ng-app, ng-repeat, ng-model, form controls and so on
It has multiple features such as MVC pattern, directives, and dependency injection. It is a common platform among developers because it is freely available.
AngularJS allows for both end-to-end and unit testing
Disadvantages of AngularJS
Being JavaScript only framework, application written in AngularJS are not safe. Server side authentication and authorization is must to keep an application secure
If the user of your application disables JavaScript, then nothing would be visible, except the basic page
Also, it is a framework of JavaScript and there is an issue of memory leak in JavaScript
In angular, there are many ways to perform the same task so it is difficult to predict which is the most optimized way to perform a certain task.
One of the most difficult tasks could be debugging the scopes.
It creates issues for developers who are unfamiliar with MVC.
Two way binding checks all the variables twice for updating which makes the UI slow
Dynamic applications didn’t always perform that well. Complex SPAs could be laggy and inconvenient to use due to their size.
