Ionic 3 : Close Modal With Phone's Back Button

I try to override the phone's back button in my Ionic App. This code permit me to open a modal to close the App if I'm not in a page, else close the page. But this doesn't allow

Solution 1:

1.Import IonicApp:

import {IonicApp } from'ionic-angular';

2.Add to your constructor:

private ionicApp: IonicApp

3.Inside your platform.registerBackButtonAction add:

let activeModal=this.ionicApp._modalPortal.getActive();
if(activeModal){
     activePortal.dismiss();
      return;
   }

I found the answer here : https://github.com/ionic-team/ionic/issues/6982

Solution 2:

You can give page name to your modal and you can access it from anywhere in app. Try this..

import { App } from'ionic-angular';

    constructor(public app: App){

    }

        platform.registerBackButtonAction(() => {

              let nav = this.app.getActiveNav();
              let view = nav.getActive().instance.pageName;


              if (view == YOU_PAGE_NAME) {
                //You are in modal
              } else {
                //You are not in modal
              }
        });

Inside your modal

pageName = 'YOU_PAGE_NAME';

Solution 3:

In the end I have this for my back button:

constructor(private platform: Platform, private config: ConfigService, private nfc: NfcService, private alertCtrl: AlertController,
      public events: Events, private translate: TranslateService, private fetch: ConfigFetchService, private menuList: MenuList, private ionicApp: IonicApp,
      private menuCtrl: MenuController
   ) {
      platform.ready().then(() => {
         this.config.pullVersion();
         let ready = true;

         platform.registerBackButtonAction(() => {
            Logger.log("Back button action called");

            let activePortal = ionicApp._loadingPortal.getActive() ||
               ionicApp._modalPortal.getActive() ||
               ionicApp._toastPortal.getActive() ||
               ionicApp._overlayPortal.getActive();

            if (activePortal) {
               ready = false;
               activePortal.dismiss();
               activePortal.onDidDismiss(() => { ready = true; });

               Logger.log("handled with portal");
               return;
            }

            if (menuCtrl.isOpen()) {
               menuCtrl.close();

               Logger.log("closing menu");
               return;
            }

            let view = this.nav.getActive();
            let page = view ? this.nav.getActive().instance : null;

            if (page && page.isRootPage) {
               Logger.log("Handling back button on a home page");
               this.alertCtrl.create({
                  title: translate.instant('Confirmation'),
                  message: translate.instant('Do you want to exit?'),
                  buttons: [
                     {
                        text: translate.instant('Cancel'),
                        handler: () => {
                        }
                     },
                     {
                        text: translate.instant('OK'),
                        handler: () => {
                           platform.exitApp();
                        }
                     }
                  ]
               }).present();
            }
            elseif (this.nav.canGoBack() || view && view.isOverlay
            ) {
               Logger.log("popping back");
               this.nav.pop();
            }
            elseif (localStorage.getItem('is_logged_in')
            ) {
               Logger.log("Returning to home page");
               this.nav.setRoot(HomePage);
            }
            elseif (!localStorage.getItem('is_logged_in')) {
               Logger.log("Not yet logged in... exiting");
               platform.exitApp();
            }
            else {
               Logger.log("ERROR with back button handling");
            }

         }, 1);

....