Step-by-Step Guide to Add a JavaScript File to a Component in Angular

Managing multiple components in a project involves including specific JS files for each component. These third-party JS files are unique to each component and cannot be global. So, the challenge is how to include these component-specific JS files.

How can we include JS files for individual components?

index.html (the main HTML file in the project)

<!doctype html>
<html lang="en>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <base href="/">

  <link rel="icon" type="image/x-icon" href="favicon.ico">
</head>

<body class="fixed-navbar">
  <div class="site">

    <app-root></app-root>

  </div>

  <script src="assets/plugins/jquery/jquery.min.js"></script>
  <script src="assets/plugins/bootstrap/js/bootstrap.bundle.min.js"></script>


  <!-- Component Specific JS Files Have To Come Here -->
  <!-- Component Specific JS Files Have To Come Here -->
  <!-- Component Specific JS Files Have To Come Here -->
  <!-- Component Specific JS Files Have To Come Here -->
  <!-- Component Specific JS Files Have To Come Here -->


</body>

</html>

post.component.html (component's HTML file)

<p> Post 1 </p>
<p> Post 2 </p>
<p> Post Bla bla bla </p>



<!-- These scripts are only for this component -->
<!-- This JS section must be placed in index.html at the designated location -->

<script src="/assets/plugins/parallax/parallax.min.js"></script>
<script src="/assets/plugins/easypiechart/jquery.easypiechart.min.js"></script>
<script>
  $(function () {
    $('.easypiechart').easyPieChart();
  });
</script>

<!-- Angular does not load these scripts onto the page -->

user.component.html (component's HTML file)

<p> User 1 </p>
<p> User 2 </p>
<p> User Bla bla bla </p>



<!-- These scripts are only for this component -->
<!-- This JS section must be placed in index.html at the designated location -->

<script src="/assets/plugins/anotherjs/anotherjs.min.js"></script>
<script src="/assets/plugins/chart2/jquery.chart2.min.js"></script>

<!-- Angular does not load these scripts onto the page -->

I cannot add JS files using "<script>" tags in *.component.html files

Angular does not allow that practice.

Answer №1

If you find yourself still facing challenges in 2022 and need to include a JS file in a specific component, here's how I successfully accomplished it:

Within the component.ts file:

   ngOnInit(): void {
    let node = document.createElement('script');
    node.src = "https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="56343939222522243726166278607866">[email protected]</a>/dist/js/bootstrap.bundle.min.js"; //Don't forget to change this to your desired js file
    node.type = 'text/javascript';
    node.async = true;
    node.charset = 'utf-8';
    document.getElementsByTagName('head')[0].appendChild(node);
 }

Answer №2

It is not possible to insert external files into the template directly.

The recommended approach is to include them in the index.html or place them inside the scripts section of the angular-cli.json

For optimal efficiency, avoid including the entire script and instead utilize node modules and import them only when needed in the respective component's ts file

Answer №3

Integrating jQuery into your Angular components can be a challenging task, but if you are determined to do so, it's important to follow the proper steps. Instead of adding jQuery directly in the template, it is recommended to include it in your TypeScript file for the component.

Begin by installing jQuery in your application:

npm install jquery --save

In your angular-cli.json file, make sure to add the following line:

"scripts": ["../node_modules/jquery/dist/jquery.min.js"],

Next, in your app.component.ts file, import jQuery like this:

import * as $ from "jquery"

Now you can start writing your jQuery code within the ngOnInit function of your component:

ngOnInit() {
  $...add your code here...
}

Answer №4

To incorporate external scripts into your Angular application, consider creating an addScript() method that can be utilized within the ngOnInit() lifecycle hook. If the need arises to use this functionality in multiple components, you can create a dedicated ScriptService and inject it into the desired components.

import {DOCUMENT} from '@angular/common';

@Component({
    selector: 'app-y',
    templateUrl: './app-y.component.html'
})
export class AppY implements OnInit {
    constructor(@Inject(DOCUMENT) private readonly document: Document) {
    }

    private addScript(scriptSrc: string) {
        const script = this.document.createElement('script');
        script.type = 'text/javascript';
        script.src = scriptSrc;
        script.async = true;
        this.document.head.appendChild(script);
    }

    public ngOnInit(): void {
        this.addScript('assets/plugins/jquery/jquery.min.js');
        this.addScript('assets/plugins/bootstrap/js/bootstrap.bundle.min.js');
    }
}

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