/Javascript/AngularJS/Warn user before leaving page angular

Warn user before leaving page angular

import { CanDeactivate } from '@angular/router';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';

export interface ComponentCanDeactivate {
  canDeactivate: () => boolean | Observable<boolean>;
}

@Injectable()
export class PendingChangesGuard implements CanDeactivate<ComponentCanDeactivate> {
  canDeactivate(component: ComponentCanDeactivate): boolean | Observable<boolean> {
    // if there are no pending changes, just allow deactivation; else confirm first
    return component.canDeactivate() ?
      true :
      // NOTE: this warning message will only be shown when navigating elsewhere within your angular app;
      // when navigating away from your angular app, the browser will show a generic warning message
      // see http://stackoverflow.com/a/42207299/7307355
      confirm('WARNING: You have unsaved changes. Press Cancel to go back and save these changes, or OK to lose these changes.');
  }
}

Source: stackoverflow.com

Similar codes

8 votes290 views3 answers
How to use another port in angular
Javascript AngularJS
2 votes254 views2 answers
Angular usehash not working
Javascript AngularJS
0 vote310 views1 answer
Vs 2019 how to publish angular environment prod
Javascript AngularJS
1 vote275 views1 answer
Angular passing data to child component
Javascript AngularJS
0 vote264 views1 answer
Angular generate without spec
Javascript AngularJS
13 votes288 views3 answers
Angular.json bootstrap path
Javascript AngularJS
0 vote279 views1 answer
Angular on back skip routes
Javascript AngularJS
28 votes395 views6 answers
Angular routing example
Javascript AngularJS
1 vote250 views2 answers
Angular input value
Javascript AngularJS
0 vote307 views2 answers
Angular 4 "Property does not exist on type component"
Javascript AngularJS