How do I implement guards in Angular?

How do I implement guards in Angular?

To implement guards in Angular, you can use the CanActivate interface to control access to routes.

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

This guard checks if the user is logged in before allowing access to a route.

What do I need to do to register this guard?

You need to add the guard to your routing module. Here's how:

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { AuthGuard } from './auth.guard';

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

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