NG2-ScrollToTop PAGE-every router change(url change)

NG2-ScrollToTop PAGE-every router change(url change)

Componet.ts
============
import {ChangeDetectionStrategy, Component } from '@angular/core'
import { ActivatedRoute,Router } from '@angular/router'


@Component({
  selector: 'rootcomponent',
.....

export class Rootcomponent{
  searchChange;
constructor( _router: Router){

_router.events.subscribe((val) => {
this.searchChange = '';   // change text box value as empty every router change
window.scrollTo(0,0);
}
this.searchChange = somevalue

}

template.html
=============

<input type="text" value="{{ searchChange }}">