What is the best way to incorporate TypeScript variables into CSS files?

In my Angular project, I am aiming to utilize a string defined in Typescript within a CSS file. Specifically, I want to set the background image of a navbar component using a path retrieved from a database service. Although I came across suggestions to use [ngStyle], it seems like the image won't update dynamically, which is not necessary in my case since I just need the paths from the database. Should I still consider implementing it? If so, how can I do this effectively? I feel a bit confused.

Currently, my Typescript file looks like this:

// ...
export class NavbarComponent{

background_url='../../../assets/img/background.png';

  constructor() { }
// ...

On the other hand, in my CSS file, I envisioned doing something along these lines:

nav{
  background-image: background_url;
}

However, my attempts have been unsuccessful.

Any suggestions on a better approach for achieving this? Thank you

Answer №1

While it may not be possible to access the variables in a ts file directly from a CSS file, you can manipulate elements in the DOM and apply styles to them using TypeScript.

For example:

document.getElementById('element').style.backgroundImage = background_url;

If you are working with frameworks like Angular, you can use @ViewChild to access elements in the DOM and style them using the renderer2 library, as shown below:

export class NavbarComponent { 
   @ViewChild('element') element: ElementRef;
   background_url='../../../assets/img/background.png';
   
   constructor(private renderer: Renderer2) {}

   setStyle() {
       this.renderer.setStyle(
           this.element.nativeElement,
           'background-image',
           this.background_url
       );
   }
}

You can then call the setStyle function wherever necessary.
For more information on renderer2, visit: https://angular.io/api/core/Renderer2

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