HOSN-app/app/src/pages/login/login.ts

import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams, MenuController, AlertController } from 'ionic-angular';
import { AuthProvider } from '../../providers/auth/auth';
import { HomePage } from '../home/home';

/**
 * Generated class for the LoginPage page.
 *
 * See https://ionicframework.com/docs/components/#navigation for more info on
 * Ionic pages and navigation.
 */

@IonicPage()
@Component({
  selector: 'page-login',
  templateUrl: 'login.html',
})
export class LoginPage {

  constructor(
    public navCtrl: NavController,
    public navParams: NavParams,
    private menuCtrl: MenuController,
    private alertCtrl: AlertController,
    private authProvider: AuthProvider) {
  }

  ionViewDidLoad() {
    this.menuCtrl.enable(false, 'sideNav');
  }

  login() {
    this.authProvider.login().then(isSuccessfull => {
      if (isSuccessfull) {
        this.navCtrl.push(HomePage);
      } else {
        let alert = this.alertCtrl.create({
          title: 'Login failed',
          subTitle: 'Somthing went wrong while trying to log you in. Pleas try again.',
          buttons: ['OK']
        });
        alert.present();
        console.log('ERROR - not logged in');
      }
    }
    );
  }

}