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@t00ts
Created November 17, 2016 12:07
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Ionic 2 PWA - Controlling browser back button
import { IonicApp, App, MenuController } from 'ionic-angular';
@Component ({...})
export class MyWebApp {
constructor (private _app: App, private _ionicApp: IonicApp, private _menu: MenuController) {
platform.ready().then(() => {
// Do your thing...
this.setupBackButtonBehavior ();
});
}
private setupBackButtonBehavior () {
// If on web version (browser)
if (window.location.protocol !== "file:") {
// Register browser back button action(s)
window.onpopstate = (evt) => {
// Close menu if open
if (this._menu.isOpen()) {
this._menu.close ();
return;
}
// Close any active modals or overlays
let activePortal = this._ionicApp._loadingPortal.getActive() ||
this._ionicApp._modalPortal.getActive() ||
this._ionicApp._toastPortal.getActive() ||
this._ionicApp._overlayPortal.getActive();
if (activePortal) {
activePortal.dismiss();
return;
}
// Navigate back
if (this._app.getRootNav().canGoBack()) this._app.getRootNav().pop();
};
// Fake browser history on each view enter
this._app.viewDidEnter.subscribe((app) => {
history.pushState (null, null, "");
});
}
}
}
@bockoblur
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bockoblur commented Feb 22, 2018

And one more thing: if browser 'back' is pressed while toast is being dismissed, it's triggering an error:
ERROR Error: Uncaught (in promise): removeView was not found
so I propose another little enhancement to catch this case, like so:

if (activePortal) {
    activePortal.dismiss().catch((err)=>{console.log('gotcha (in dismiss)', err)});
    return;
}

@napindc
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napindc commented Jun 3, 2018

@bockoblur - your 'getrootnav' deprecation doesn't seem to work. pressing back does nothing with that code.

@janiylikorpi
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janiylikorpi commented Mar 14, 2019

This is great, but it's not working well (Ionic 3). If I hit browser back button more that once, it will navigate back and in my case results in error as navigation stack is empty (no root).

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