angular window scroll to top not working

                                      var callback = getByClass(containers[i], 

                                    //inside the app.component.html add (activate):
<router-outlet  (activate)="onActivate($event)"></router-outlet>

//inside app.component.ts, add inside the class of the component:
export class AppComponent {
 
  onActivate(event) {
    window.scroll(0,0);
    //or document.body.scrollTop = 0;
    //or document.querySelector('body').scrollTo(0,0)
    
}
}