How do I use async route guards in Vue Router?

How do I use async route guards in Vue Router?

To use async route guards in Vue Router, you can define a guard function that returns a Promise. This allows you to perform asynchronous operations before navigating to a route.

Can you give me an example of an async route guard?

Sure! Here's a simple example:

const router = new VueRouter({
  routes: [
    {
      path: '/protected',
      component: ProtectedComponent,
      beforeEnter: (to, from, next) => {
        checkAuth().then(isAuthenticated => {
          if (isAuthenticated) {
            next();
          } else {
            next('/login');
          }
        });
      }
    }
  ]
});

In this example, checkAuth is an async function that checks if the user is authenticated.

What happens if the async operation fails?

If the async operation fails, you can handle it in the catch block of the Promise. For example, you might redirect the user to an error page or show a notification.

Is there a way to cancel the navigation if the async operation takes too long?

Yes, you can implement a timeout mechanism. If the async operation exceeds a certain duration, you can call next(false) to cancel the navigation.