Angular is a digital platform and web framework 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.
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A Complete Guide For Using JavaScript In Angular
You can follow these steps to use JavaScript in Angular-
Angular Command-Line Interface (CLI)
Angular CIS is the command-line interface 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.
For instance, we will create an Angular project named ‘Education’, ng new education.
Package Manager Installation In JavaScript
After installing CLI and creating a project for JavaScript files, the next step includes using the desired package manager to install the library that will be required throughout the entire procedure by visiting the created project.
For example, you can use Node Package Manager (NPM) to install Underscore or Lodash utility libraries.
Addition Of JavaScript Data Files
Adding some internal or external files is essential for performing tasks using JavaScript. 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.
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 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.
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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.
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.
Importing Declaration In Angular
Following successfully installing 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 ‘ ;*/
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.
Testing
You must operate the application and test it for the final results as soon as you finish all the steps mentioned above. 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.
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FAQS
What are some common uses of JavaScript features in Angular?
Some commonly used JavaScript features in Angular include functions, arrays, objects, and the ES6 syntax for creating classes and modules.
What is TypeScript in Angular?
TypeScript is a superset of JavaScript that comes in Angular for creating more robust and scalable web applications. It includes support for static typing, classes, and interfaces.
Can I use plain JavaScript in Angular?
Yes, it is possible to use plain JavaScript in Angular. However, using TypeScript is for those building larger and more complex web applications.
What is the role of JavaScript in Angular components?
JavaScript gets use extensively in Angular components for handling user input, manipulating the DOM, and communicating with external APIs or services.
What is the role of JavaScript in Angular routing?
JavaScript comes in Angular routing for defining the various routes and navigating between different views and components in a web application.
What is the role of JavaScript in Angular services?
JavaScript comes in use in Angular services for encapsulating business logic and data access functionality that can share across multiple components in a web application.
Conclusion
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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