app.component.ts
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	import { Component, OnInit } from '@angular/core';
	import { AuthenticationService } from './authentication.service';
	import { Title } from '@angular/platform-browser';
	import { Router, NavigationStart, NavigationEnd } from '@angular/router';
	import { Location, PopStateEvent } from "@angular/common";

	@Component({
	selector: 'app-root',
	templateUrl: './app.component.html'
	})
	export class AppComponent implements OnInit {

	private lastPoppedUrl: string;
	private yScrollStack: number[] = [];

	constructor(public auth: AuthenticationService, private title: Title,private router: Router, private location: Location) {}


	ngOnInit() {
	this.title.setTitle('Admin');
	this.location.subscribe((ev:PopStateEvent) => {
	this.lastPoppedUrl = ev.url;
	});
	this.router.events.subscribe((ev:any) => {
	if (ev instanceof NavigationStart) {
	if (ev.url != this.lastPoppedUrl)
	this.yScrollStack.push(window.scrollY);
	} else if (ev instanceof NavigationEnd) {
	if (ev.url == this.lastPoppedUrl) {
	this.lastPoppedUrl = undefined;
	window.scrollTo(0, this.yScrollStack.pop());
	} else
	window.scrollTo(0, 0);
	}
	});

	}
	}