How do I implement router guards in Angular using Angular CLI?

How do I implement router guards in Angular using Angular CLI?

To implement router guards in Angular, you first need to create a guard using the Angular CLI. You can do this by running the command: ng generate guard your-guard-name. This will create a guard file for you.

What types of guards can I create?

You can create several types of guards: CanActivate, CanDeactivate, Resolve, CanLoad, and CanActivateChild. Each serves a different purpose in controlling access to routes.

Can you give me an example of a CanActivate guard?

Sure! A CanActivate guard checks if a user is logged in before allowing access to a route. You can implement it like this:

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 = // your logic to check if user is logged in;
    if (!isLoggedIn) {
      this.router.navigate(['/login']);
      return false;
    }
    return true;
  }
}

How do I apply this guard to a route?

You can apply the guard in your routing module like this:

const routes: Routes = [
  { path: 'protected', component: ProtectedComponent, canActivate: [AuthGuard] },
];