app.component.ts
6c7652c281b9master

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);
			}
			});

			}
			}