login.ts

import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
import { ToastController } from 'ionic-angular';
import { HomePage } from '../home/home';
/**
 * Generated class for the LoginPage page.
 *
 * See http://ionicframework.com/docs/components/#navigation for more info
 * on Ionic pages and navigation.
 */
@IonicPage()
@Component({
  selector: 'page-login-page',
  templateUrl: 'login-page.html',
})
export class LoginPage {
  login = {};
  constructor(public navCtrl: NavController,
    public navParams: NavParams,
    public toastCtrl: ToastController) {
  }
  do_login(login){
    if((login.user=="alcides") && (login.pwd="123")){
      this.navCtrl.push(HomePage);
    }else{
      let toast = this.toastCtrl.create({
      message: 'Usuário ou senha inválidos',
      duration: 3000,
      position: 'bottom'
    });
    toast.present();
    }
  }
  ionViewDidLoad() {
    console.log('ionViewDidLoad LoginPage');
  }

}