import { Component } from '@angular/core' ; import { IonicPage , NavController , NavParams } from 'ionic-angular' ; import { HelpPage } from "../help/help" ; @ IonicPage ( ) @ Component ( { selector : 'page-placeholder' , templateUrl : 'placeholder.html' , } ) export class PlaceholderPage { constructor ( public navCtrl , public navParams ) { } openHelpPage ( ) { this . navCtrl . push ( HelpPage ) . catch ( ( e ) => { console . error ( 'Caught error at PlacehorderPage.openHelpPage()' ) ; console . error ( e ) ; } ) ; } }