How to disable Browser back button in Angular 2

Question

I'm developing a web site using Angular 2. Is there any way to disable or trigger Browser back button using Angular 2?

Thanks

Answer 1

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;
  }
}

Answer 2

import { LocationStrategy } from '@angular/common';
constructor( private location: LocationStrategy){  
// preventing back button in browser implemented by "Samba Siva"  
 history.pushState(null, null, window.location.href);  
this.location.onPopState(() => {
  history.pushState(null, null, window.location.href);
});  
}

its working fine to me 100% in angular2/4/5

Answer 3

This Very simple, use the following code, This example code is from plain javascript i have converted this into angular and using in my 2-3 projects

// Inject LocationStrategy Service into your component
    constructor(
        private locationStrategy: LocationStrategy
      ) { }


// Define a function to handle back button and use anywhere
    preventBackButton() {
        history.pushState(null, null, location.href);
        this.locationStrategy.onPopState(() => {
          history.pushState(null, null, location.href);
        })
      }

You can define preventBackButton in any service as well and call it from there

Answer 4

I've tried all the solutions mentioned above but none of them worked perfectly for me. Finally I've found this npm module that worked immediately and perfectly, after two days of failed attempts.

Github: https://github.com/Zatikyan/angular-disable-browser-back-button#readme