login.ts

export class LoginDetails {
  username: string;
  password: string;
}

@Component({
  selector: 'page-login',
  templateUrl: 'login.html'
})
export class LoginPage {
  
  public loginDetails: LoginDetails;

  constructor(public navCtrl: NavController,
              public user: User,
              public loadingCtrl: LoadingController) {
    this.loginDetails = new LoginDetails(); 
  }
  .
  .
  .
}