Inserting Javascript into an Angular application?

Question

Building an application in Angular, and we want to add a fairly complex component--in a general sense, not an Angular sense--that was completely built in Javascript, originally for a separate purpose. The Javascript content currently spans several files; for the sake of simplicity, we'll say there's model.js, library1.js, and library2.js, but it's more than just those three in reality. The function render() from model.js builds the component.

I've added model.js to angular.json, but when I go to my model.html page on the Angular side, the <script> tags don't seem to work at all, whether it's:

<script>
render();
</script>

or

<script>
console.log("Hello world!");
</script>

Is there any way to force to work, or a better way to make this work in general?

Aakash Kumar · Accepted Answer · 2022-04-25 15:47:35Z

If you are trying to add tag directly under a Component HTML then it is not going to work I believe.

There is no Angular2 way of adding a script tag to a template.

You can do the following in the modal.component file to dynamically add a script tag use it like this:

constructor(private elementRef:ElementRef) {};

ngAfterViewInit() {
  var s = document.createElement("script");
  s.type = "text/javascript";
  s.src = "http://somedomain.com/somescript";
  this.elementRef.nativeElement.appendChild(s);
}

See also - Adding scripts to the component

In your case, you can remove the JS file from angular.json and load it at run time like this:

private addRenderJS() {
    const s = this.doc.createElement('script');
    s.src = '/path/my-render-lib.js';
    const head = this.doc.getElementsByTagName('head')[0];

    const s1 = this.doc.createElement('script');
    s1.type = 'text/javascript';
    s1.innerHTML = `
    render();
    `;
    head.appendChild(s);
    head.appendChild(s1);
  }

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