Having trouble with Angular router.navigate not functioning properly with route guard while already being on a component?

I am currently troubleshooting an issue with the router.navigate(['']) code that is not redirecting the user to the login component as expected. Instead of navigating to the login component, I find myself stuck on the home component. Upon adding debugger; to the code, it appears that the program enters into some kind of infinite loop.

Here is the sequence of events: When a user visits the site, they are immediately redirected to /login due to the Route Guard failing. After successfully logging in, the Route Guard passes and the user should be directed to [' '] which represents the HomeComponent. However, upon clicking logout, I expect the navigation to [' '] to fail and simply redirect back to /login. Strangely, the application remains on the HomeComponent without navigating away.

home.component.ts

  logout() {
    this.userService.logout();
    this.router.navigate(['']);
  }

user.service.ts

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    let url: string = state.url;
    return this.verifyLogin(url);
  }

  verifyLogin(url: string): boolean {
    if (this.userLoggedIn) { return true; }

    this.router.navigate(['/login']);
    return false;
  }

  logout() {
    this.userLoggedIn = false;
  }

app-routing.module.ts

const routes: Routes = [
    { path: '' , component: HomeComponent, canActivate: [UserService]},
    { path: 'login', component: LoginComponent },
    { path: 'register', component: RegisterComponent },
    { path: '**' , redirectTo: '' }
];

Answer №1

In Angular 5 and above, you have the ability to use router.navigate(['']) to reload the current URL. This feature is not widely known or documented, but if you are familiar with server-heavy frameworks like .NET, it can feel more intuitive.

To achieve this, add runGuardsAndResolvers: 'always' to one of your paths and onSameUrlNavigation: 'reload' to the RouterModule initialization in your app-routing.module.ts file:

const routes: Routes = [
    { path: '' , component: HomeComponent, canActivate: [UserService], runGuardsAndResolvers: 'always' },
    { path: 'login', component: LoginComponent },
    { path: 'register', component: RegisterComponent },
    { path: '**' , redirectTo: '' }
];

@NgModule({
    imports: [RouterModule.forRoot(routes, {
        onSameUrlNavigation: 'reload'
    })],
    exports: [RouterModule]
})
export class AppRoutingModule { }

Answer №2

Is it necessary to navigate when the path is already in [' '] and then you prompt for another navigation to [' ']? Simply add 'this.router.navigate(['/login'])' inside the logout function.

logout() {
   this.userLoggedIn = false;
   this.router.navigate(['/login']);
}

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