What is an example of using routing guards in Angular?
Routing guards in Angular are used to control access to routes. For example, you can use a CanActivate guard to prevent unauthorized users from accessing certain routes.
Can you show me a code example of a CanActivate guard?
Sure! Here's a simple example:
import { Injectable } from '@angular/core';
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, Router } from '@angular/router';
@Injectable({ providedIn: 'root' })
export class AuthGuard implements CanActivate {
constructor(private router: Router) {}
canActivate(
next: ActivatedRouteSnapshot,
state: RouterStateSnapshot): boolean {
const isLoggedIn = false; // Replace with actual login check
if (isLoggedIn) {
return true;
} else {
this.router.navigate(['/login']);
return false;
}
}
}
This guard checks if the user is logged in and redirects to the login page if not.
How do I apply this guard to a route?
You can apply the guard in your routing module like this:
const routes: Routes = [
{ path: 'dashboard', component: DashboardComponent, canActivate: [AuthGuard] },
{ path: 'login', component: LoginComponent }
];
This ensures that the 'dashboard' route is protected by the AuthGuard.
What happens if the guard returns false?
If the guard returns false, the router will not navigate to the requested route, and the user will remain on the current page. In the example, they would be redirected to the login page.
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