1scrollToTop(){
2	window.scroll(0,0);
3}

1//inside the app.component.html add (activate):
2<router-outlet  (activate)="onActivate($event)"></router-outlet>
3
4//inside app.component.ts, add inside the class of the component:
5export class AppComponent {
6 
7  onActivate(event) {
8    window.scroll(0,0);
9    //or document.body.scrollTop = 0;
10    //or document.querySelector('body').scrollTo(0,0)
11    
12}
13}
14

1import { Component, OnInit } from '@angular/core';
2import { Router, NavigationEnd } from '@angular/router';
3
4@Component({
5    selector: 'my-app',
6    template: '<ng-content></ng-content>',
7})
8export class MyAppComponent implements OnInit {
9    constructor(private router: Router) { }
10
11    ngOnInit() {
12        this.router.events.subscribe((evt) => {
13            if (!(evt instanceof NavigationEnd)) {
14                return;
15            }
16            window.scrollTo(0, 0)
17        });
18    }
19}