Make an overlay always on top of other overlays

[abdulkareemnalband]

Please describe the feature you would like to request.

whenever a new overlay is created it is positions on top of other existing overlays (speaking wrt z-index). provide a way to mark a overlay need to be shown always on top of other overlay's irrespective of order of creation

What is the use-case or motivation for this proposal?

In our application we are using overlay as container for in-app notifications (we don't use/follow material spec) We also use overlay for different use-cases like full-window dialogs, custom drop-downs , and such things opening new overlay is hiding the notifications which we do not want

[csbenjamin]

For now, I am using the following workaround:

// somewhere_in_my_code.ts
const tmpClass = `panel-${Date.now()}`;
const dialog = this.dialog.open(ConfirmComponent,
  {data: {message}, panelClass: tmpClass, backdropClass: ['cdk-overlay-dark-backdrop', 'overlay-priority-1']});
dialog.afterOpened().subscribe(() => {
  if (typeof document !== 'undefined') {
    const panel = document.querySelector(`.${tmpClass}`);
    if (panel && panel.parentElement) {
      panel.parentElement.classList.add('overlay-priority-1');
    }
  }
});

// styles.scss
.overlay-priority-1 {
    z-index: 1001 !important;
}

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[Fedduh]

Just my 2 cents for others looking for an answer.

To achieve what you want, set the .cdk-global-overlay-wrapper element to have a z-index that's higher than the default of 1000. You cannot apply a style directly to this, but you can apply a class to the child element (panelClass).

With modern css you can also use the :has selector to style an element based on child elements. This way you don't have to use the javscript alternative in the previous comment. (caniuse support for :has is at 91% and supported in all major browsers)

const overlayConfig = new OverlayConfig({
      // .. other settings
      panelClass: 'overlay-priority',
    });

And in your global (s)css

.cdk-global-overlay-wrapper:has(.cdk-overlay-pane.overlay-priority) {
  z-index: 1001; // default modals are 1000
}