How to use JavaScript in Angular?- A Complete Guide

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Angular is a digital platform and web framework that is used for developing mobile and desktop network applications with the help of standard programming languages such as HTML and Typescript. The Google Angular Team and a fraternity of individuals and companies supervise it.

It was initially announced on 14th September 2016 by Google. Some of the versions of Angular are Angular 2.0, Angular 4.3, Angular 10, Angular 12, and so on. The web framework of Angular was developed by the team AngularJS. This article will provide step-by-step guidance for loading and using JavaScript code in different versions of Angular. 

Angular JavaScript

See Also: Using JavaScript in ASP.Net- A Complete Guide

A Complete Guide For Using JavaScript In Angular 

You can follow these steps to use JavaScript in Angular-

1. Angular Command-Line Interface (CLI)

Angular CIS is the command-line interface that is utilized for developing, computing, framing, and rebuilding Angular web applications. So, the first and foremost place to use JavaScript is the installation of the CLI into the computer. After installing, create a new project or choose an existing Angular project for operating JavaScript files.

Angular CLI

For instance, we will create an Angular project named ‘Education’, ng new education

2. Package Manager Installation In JavaScript

After installing CLI and creating a project for JavaScript files, the next step includes using the desired package manager for the installation of the library that will be required throughout the entire procedure by visiting the created project.

Package Manager in JS

For example, you can use Node Package Manager (NPM) to install Underscore or Lodash utility libraries.

3. Addition Of JavaScript Data Files

For performing tasks using JavaScript, the addition of some internal or external files is essential. But do not add external files directly in Angular. To attach JavaScript files, situate them on the computer, create a JavaScript directory in the assets folder, and set them inside it.

Then, you have to click the JavaScript file on Angular and open it. Add the JavaScript files in the ’Scripts’ section. Make the way to each JavaScript file you wish to store into the array. One should not omit to change the backward slashes to forward slashes. As the assets array is located inside the src directory, we write ‘src/assets’ followed by the file name. Finally, if we operate the app, it will load and accomplish all the codes in JavaScript files. 

4. Variables In JavaScript Files

For manipulating the functions and variables included in JavaScript data files, the declaration of a reference in TypeScript is of utmost importance. TypeScript generally supplies declaration files that characterize and systematize a JavaScript file or a library.

Variables in JS

These libraries come with a typing file that does not require the installation of a typical destination for TranScript. However, in some cases, libraries might not contain .d.ts file extensions; for that, you should install the typing destination. The next step is to install the declaration using this instruction: npm install – – save.

5. Importing Declaration In Angular

Following the successful installation of the declaration file, you must import the declaration into the Angular application. For example, if you are using Underscore, you must open the app .component .ts file with the help of your Integrated Development Environment (IDE) and attach the subsequent code at the summit of the desired file:

Import * as _ from

‘ underscore ‘;/***OR : * 

Import ‘ underscore ‘ ;*/ 

6. Content Delivery Networks (CDN) In JavaScript

If there is the availability of any Content Delivery Networks, commonly known as CDNs, or link to any depository for the data files in JavaScript, you can open the index.html page and insert script tags.


This will load all your files. However, you cannot directly insert script tags into the Html page of components. You manually have to insert them on the inside of the Transcript data file.

7. Testing 

As soon as you finish all the steps mentioned above, you must operate the application and test it for the final results. If the application loads, the procedure is successful. However, if you want to make changes, follow the same steps until you get the desired results.

See also: Javascript Vs. Typescript: Which Is Better?


JavaScript is a fascinating programming language for creating compelling and bilateral network content, such as applications and browsers. Following the above-illustrated guide, one can quickly learn to use JavaScript in any version of Angular application.

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