frontend-tutorial-framework/src/app/app.component.ts

// Copyright (C) 2018 Avatao.com Innovative Learning Kft.
// All Rights Reserved. See LICENSE file for details.

import { Component, OnInit } from '@angular/core';
import { Title } from '@angular/platform-browser';
import { config } from './config';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit {
  documentTitle: string = config.documentTitle;

  constructor(private titleService: Title) {}

  ngOnInit() {
    this.titleService.setTitle(this.documentTitle);
    window.addEventListener('beforeunload', (event) => {
      const confirmationMessage = 'Refreshing this page may mess up your challenge/tutorial state. Are you sure?';
      event.returnValue = confirmationMessage;
      return confirmationMessage;
    });
  }
}