CODE EXAMPLE FOR TYPESCRIPT

Scroll,Position

import { HostListener } from '@angular/core';

@ViewChild('curtain') divCurtain: ElementRef;

export class ComponentX {
    @HostListener('window:scroll', ['$event']) onScrollEvent($event) {
        console.log(window.pageYOffset);
        this.divCurtain.nativeElement.style.top = window.pageYOffset.toString().concat('px');
    }

    ngOnInit(): void { }
}