How do I implement async route guards in Vue Router?

How do I implement async route guards in Vue Router?

To implement async route guards in Vue Router, you can use the beforeEnter navigation guard. This allows you to perform asynchronous operations before entering a route.

Can you give me an example of how to use it?

Sure! Here's a simple example:

const router = new VueRouter({
  routes: [
    {
      path: '/protected',
      component: ProtectedComponent,
      beforeEnter: (to, from, next) => {
        // Simulate an async check, like an API call
        setTimeout(() => {
          const isAuthenticated = false; // Replace with actual auth check
          if (isAuthenticated) {
            next();
          } else {
            next('/login');
          }
        }, 1000);
      }
    }
  ]
});

This code checks if the user is authenticated before allowing access to the /protected route.

What happens if the async operation fails?

If the async operation fails, you can handle it by calling next(false) to cancel the navigation or redirect to an error page. For example:

setTimeout(() => {
  const hasError = true; // Simulate an error
  if (hasError) {
    next(false); // Cancel navigation
  } else {
    next();
  }
}, 1000);