How to make router param changes as reactive?

In Vue, if we want to make route parameters reactive—meaning that when route parameters change, the component updates or performs certain actions—we can use features of Vue Router to achieve this.

Vue Router provides several methods to observe and respond to changes in route parameters:

1. Listening to the $route Object

In Vue components, we can use the watch property to monitor the $route object. This way, whenever the route changes (including path, query parameters, or hash changes), the function defined in watch is triggered.

javascript
export default {
  watch: {
    '$route'(to, from) {
      // Actions performed when the route changes
      console.log('Route changed', to);
      // You can perform data requests or other logic based on route changes
    }
  }
}

2. Using beforeRouteUpdate Navigation Guard

For changes in route parameters, especially when navigating between different parameters on the same route (e.g., from /users/1 to /users/2), we can use the beforeRouteUpdate navigation guard within the component. This hook is called when route parameters change and the component is reused.

javascript
export default {
  beforeRouteUpdate(to, from, next) {
    console.log('Route parameters changed', to.params);
    // Here, you can update component data based on the new route parameters
    next(); // Ensure to call next() to proceed with the navigation
  }
}

3. Using Computed Properties with $route

Additionally, we can use computed properties to dynamically return data based on changes in $route. Whenever the associated route parameters change, the computed property recalculates.

javascript
export default {
  computed: {
    userId() {
      // Return the current route's user ID parameter
      return this.$route.params.userId;
    }
  }
}

This method allows us to directly bind userId in templates or other places, and it updates accordingly when the user ID in the URL changes.

In summary, by using the above methods, we can effectively make route parameters reactive in Vue, enabling components to update or perform corresponding logic based on these parameter changes.