Using the `document.querySelector` method to target the `.mat-progress-bar-fill::after` element

Is there a way to dynamically adjust the fill value of an Angular Material Progress Bar?

In CSS, I can achieve this with:

::ng-deep .mat-progress-bar-fill::after {
  background-color: red;
}

However, since the value needs to be dynamic, I am unable to do this in CSS.

I attempted to use - 

(document.querySelector('.mat-progress-bar-fill::after') as HTMLElement).style.background = 'green';
but it resulted in an error: 
ERROR TypeError: Cannot read properties of null (reading 'style')

Interestingly, I was able to set the background color of .mat-progress-bar-buffer using the same method - 

(document.querySelector('.mat-progress-bar-buffer') as HTMLElement).style.backgroundColor = 'red';

Therefore, my question is how can I select and manipulate .mat-progress-bar-fill::after using document.querySelector? Or, is there a different approach to dynamically setting the fill bar within an Angular component?

cssangularangular-material

Answer №1

When it comes to the before and after pseudo elements, JavaScript may not recognize them as they are not part of the DOM. However, a workaround is to utilize CSS variables by setting them in the specific element so that the pseudo element can detect them.

For example, in your CSS:

::ng-deep .mat-progress-bar-fill::after {
  background-color: var(--bg);
}

And then in your JavaScript:

document.querySelector('.mat-progress-bar-buffer').style.setProperty('--bg', 'red');

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