AngularJS – Preferred Single Page Applications Technology

Abstract

This article is targeted to the users who are looking for developing Single Page Applications, where one-time code is bundled and rendered on the client site, so as to avoid too much of to and fro. SPA gives an enormous benefit to its user in case of speed, code management and maintainability. It is most suitable for small size applications

Introduction (About Single Page Applications)

Single Page Applications or SPA’s are Web Applications that load the HTML and dynamically keep on refreshing the required portion of the page with the newly updated data. They avoid the hustle of loading the full page and load only the portion of the page with the required and the meaningful data, thus the SPA’s are very fast.

angularJsDoc

Benefits of SPA:

  • Applications are fast, scalable and can be easily maintained. As most of the data are loaded initially at once and only data transmission is carried further.
  • Suitable for small/medium scale businesses.
  • Reusable code, as the developers can use the same backend code for services/DB etc
  • SPA’s are light weighted and hence they are very suitable for mobile applications.

Limitations of SPA

  • SEO optimization is difficult as the data is refreshed using asynchronous calls
  • Needs javascript to be installed and enabled on the user machine if it is disabled the site may load inappropriately

OVERVIEW – AngularJS

AngularJS is client-side scripting that provides web application platform to build web apps for the end user. It works on the two-way binding that is it will automatically update the view when the model changes and vice versa.

Though single page application development isn’t a new thing AngularJS still stands in the first place, when it comes for SPA development companies to use angularjs web application development.

Why AngularJS

AngularJS is most used a deployed framework that is used for the SPA development, the most important thing about the angularjs is that is has been given by Google, it hold the MVC architecture thus is has one for the most powerful architecture. With high-end built-in functionality and online support, it is so easy for developers to develop almost everything, and it’s easy to scale and maintain the applications.

Angular CLI

Angular CLI is a command line tool for creating projects, adding files to the projects and numerous other development tasks like testing, bundling, compiling, and deployment.

We need to install Node.js on our machine. (Node.js version > 8.x and npm version > 5.x)

Then we can install the Angular CLI globally to our system by command

angularcli

Creating a Project

Go to the file/folder where you want to create the project, open the terminal and execute the below command

angularcli1

This may take some time as angular CLI installs the npm packages, create projects with the default app.

After the execution of the above command following screen will appear

angularcli2

Building Deploying the project

angularcli3

This command will launch the server and keep on building and updating the application as you make changes.

Folder Structure

Now go and check in the drive project must be there, your new AngularJS project will contain the below structure under the folder src. src folder will contain all your files, HTML, angular, images, CSS etc related to your project. Other folders parallel to the src are support folder/files which are required to build and deploy project:

angularcli4

Understanding Folder/Files structure

FileDescription
e2e/This folder contains End to End test cased for the test cycle to test the main application
Node_modules/Node.js creates this folder. It holds all the third party modules listed in packet.json.
src/*src is the main folder that will contain all your code, style sheets, HTML etc, all the things related to your project. In src lies many other folder and files
src/app/This is a folder that will contain all your components. This is the default component and every component will have the same structure by default. component.ts code file, component.HTML template, component.CSS stylesheet, component.spec.ts unit test file
Command to add the components is:
src/assetsThis folder is used to keep the images, fonts, etc that needs to be copied to the build folder when an application is built.
src/environmentAs the name says this is folder contains 2 files by default each related to your production and development environment, when we have different keys, connection strings, API endpoints etc for the development and production we can define them separately over here. These files are replaced on the fly when we build our application
Favicon.icoThis is the default icon of the site you are building by default it shows the Angular icon
Index.htmlThis is the default HTML file if any one lands to your site, usually this does not needs any frequent updates and also CLI adds all js and CSS files when building an app.
main.tsThe main entry point of the application.
polyfill.tsUsed for browser compatibility
style.cssContains the CSS and style sheet files related to the project
test.tsHold the test cases
tsconfig.{app|spec}.jsonTypescript compiler configuration about how your application should compile.
angular-cli.jsonContains configuration of Angular 4 Project. It has project name, root directory name containing all the components, services, directives, pipes, the starting point of application (index.html file), the starting point of typescript (main.ts), style files (style.css) .
editor.configContains the settings for the editor like style, size of a character, line length.
.gitignoreThis is for the git purpose to define the folders and files which needs to exclude from our repository in git.
karma.conf.jsThis is configuration used for writing the UT, it is a test runner used in accordance with the jasmine framework, both jasmine and karma are written by the angular team.
Package.json Package.json contains the dependency modules used in the application. For all the libraries used in our project we need to mention here along with the version and just need to execute the command npm install. It will execute all the dependencies and download in node_modules folder.
protector.conf.jsContains testing configurations.
tsconfig.jsonIt contains the configurations for typescripts.
tslint.jsonUsed for defining the code style, we can change the configuration to define the build process of our application.

AngularJS sites are very well on frontend side in MVC driven architecture making use of angularjs development services at its best. The continuous evolution of this technology by Google and a huge strength of community developers adding numerous benefits to frontend development of websites and portals.

About Author:
Author Megha Kansal is a Microsoft Certified Programmer working as a Technical project manager with QSS Technosoft. She is a technology writer in .net, Angular. She has completed her Master’s degree in Computer Science.

About QSS:
QSS has a proven track in angularjs web application development web-based applications for its esteemed customers. The company has a core competency in developing and delivering Enterprise level Angular JS applications. The Angular JS competency has experienced and dedicated team of angularjs developers.

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