How can I implement advanced router guards in Vue 3?

How can I implement advanced router guards in Vue 3?

In Vue 3, you can implement advanced router guards by using navigation guards like beforeEach, beforeEnter, and afterEach. These allow you to control access to routes based on conditions.

Can you give me an example of using beforeEach guard?

Sure! You can use beforeEach to check if a user is authenticated before allowing access to certain routes. Here's a simple example:

router.beforeEach((to, from, next) => {
  const isAuthenticated = // your logic to check authentication;
  if (to.meta.requiresAuth && !isAuthenticated) {
    next({ name: 'Login' }); // redirect to login if not authenticated
  } else {
    next(); // proceed to the route
  }
});

What if I want to add a loading spinner while the guard checks?

You can manage a loading state in your component or Vuex store. Set a loading flag to true before the guard checks and set it to false after the check is complete. Here's a basic example:

let loading = false;

router.beforeEach((to, from, next) => {
  loading = true;
  const isAuthenticated = // your logic;
  setTimeout(() => { // simulate async operation
    loading = false;
    if (to.meta.requiresAuth && !isAuthenticated) {
      next({ name: 'Login' });
    } else {
      next();
    }
  }, 1000);
});

Can I use router guards for data fetching?

Yes, you can use router guards to fetch data before entering a route. You can do this in the beforeEnter guard. For example:

const fetchData = async (to, from, next) => {
  const data = await fetchDataFromAPI();
  if (data) {
    next(); // proceed if data is fetched
  } else {
    next({ name: 'Error' }); // redirect on error
  }
};

router.beforeEnter(fetchData);