Not sure if this is already sorted, but posting the answer nonetheless, for future references.
To tackle this, you basically need to add a listener in your app-component and setup a canDeactivate guard on your angular-router.
// in app.component.ts
import { LocationStrategy } from '@angular/common';
@Component({
selector: 'app-root'
})
export class AppComponent {
constructor(
private location: LocationStrategy
) {
// check if back or forward button is pressed.
this.location.onPopState(() => {
// set isBackButtonClicked to true.
this.someNavigationService.setBackClicked(true);
return false;
});
}
}
// in navigation guard
@Injectable()
export class NavigationGuard implements CanDeactivate<any> {
constructor(private someNavigationService: SomeNavigationService) {}
canDeactivate(component: any) {
// will prevent user from going back
if (this.someNavigationService.getBackClicked()) {
this.someNavigationService.setBackClicked(false);
// push current state again to prevent further attempts.
history.pushState(null, null, location.href);
return false;
}
return true;
}
}