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main.ts

index.html

import { bootstrapApplication } from '@angular/platform-browser';
import { Component, inject } from '@angular/core';
import { provideRouter, RouterOutlet, RouterLink, withHashLocation, Router } from '@angular/router';

let loggedIn = false;

export const authGuard = () => {
  if (loggedIn) return true;
  const router = inject(Router);
  return router.createUrlTree(['/']);
};

@Component({
  standalone: true,
  template: `<p>Home (public). Login to access protected route.</p>`
})
export class Home {}

@Component({
  standalone: true,
  template: `<p>Protected works! You are logged in.</p>`
})
export class Protected {}

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [RouterOutlet, RouterLink],
  styles: [`
    nav a { margin-right: 8px; text-decoration: none; }
    .status { margin-left: 8px; font-weight: 600; }
  `],
  template: `
    <h3>Route Guard (canActivate)</h3>
    <div class="toolbar">
      <button (click)="toggle()">{{ loggedIn ? 'Log out' : 'Log in' }}</button>
      <span class="status">Status: {{ loggedIn ? 'Logged in' : 'Logged out' }}</span>
    </div>
    <nav>
      <a routerLink="/">Home</a>
      <a routerLink="/protected">Protected</a>
    </nav>
    <router-outlet></router-outlet>
  `
})
export class App {
  get loggedIn() { return loggedIn; }
  toggle() { loggedIn = !loggedIn; }
}

const routes = [
  { path: '', component: Home },
  { path: 'protected', component: Protected, canActivate: [authGuard] }
];

bootstrapApplication(App, {
  providers: [provideRouter(routes, withHashLocation())]
});

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Angular Router - Route Guard</title>
</head>
<body>
  <app-root></app-root>
</body>
</html>