The best way to avoid routing before certain async data in the Vuex store has finished loading

Question

The best way to avoid routing before certain async data in the Vuex store has finished loading

I am facing a challenge in my application where I require certain data to be loaded into the VueX store before routing can commence, such as user sessions.

An example scenario that showcases a race condition is as follows:

// Defined routes
{
  name: 'login',
  path: '/login',
  component: Login,
  meta: {
    goToIndexIf: () => store.getters['auth/loggedIn']
  }
}

In this case, the route guard may execute before the user information has been fetched from the server.

Even though I attempted conditional rendering, it did not solve the issue as the route guards function regardless of whether

<router-view v-if="storeReady">

is present in the rendered template or not.

Is there a way for me to ensure that all my routing operations wait for asynchronous data to be loaded?

javascript vue.js vue-router vuex race-condition

Answer 1

Answer №1

Implementing a solution is straightforward. Simply include an init or similar Vuex action in the necessary sections of your store.
This should produce a Promise for all critical data requests that your application depends on:

init ({ dispatch }) {       // Alternatively, can be made async and utilize await instead of return
  return Promise.all([
    dispatch('getUserSession'), // Utilizing another <b>action</b>
    dispatch('auth/init'),      // From a different module
    fetch('tehKittenz')         // Utilizing the native <b>fetch</b> API
    // ...
  ])
}

The provided code can work with anything that returns a Promise.

Subsequently, establish a global navigation guard in your router using beforeEach.
This guard will hold off on navigating until the promise generated by a dispatch to the store resolves.

// Within your router initialization section
const storeInit = store.dispatch('init')

// Prior to <b>all other beforeEach</b>
router.beforeEach((to, from, next) => {
  storeInit.then(next)
    .catch(e => {
      // Manage any errors that arise
    })
})

This approach ensures that if routing occurs before the complete loading of the store, the router will patiently wait.
In the event that routing takes place afterwards, the promise will have already been fulfilled and routing will progress smoothly.

Remember to employ techniques like conditional rendering to prevent displaying an empty screen while routing awaits data retrieval.

^*: By doing this, all routing and navigation activities are suspended during data retrieval processes. Exercise caution.

Answer 2

Implementing a solution is straightforward. Simply include an init or similar Vuex action in the necessary sections of your store.
This should produce a Promise for all critical data requests that your application depends on:

init ({ dispatch }) {       // Alternatively, can be made async and utilize await instead of return
  return Promise.all([
    dispatch('getUserSession'), // Utilizing another <b>action</b>
    dispatch('auth/init'),      // From a different module
    fetch('tehKittenz')         // Utilizing the native <b>fetch</b> API
    // ...
  ])
}

The provided code can work with anything that returns a Promise.

Subsequently, establish a global navigation guard in your router using beforeEach.
This guard will hold off on navigating until the promise generated by a dispatch to the store resolves.

// Within your router initialization section
const storeInit = store.dispatch('init')

// Prior to <b>all other beforeEach</b>
router.beforeEach((to, from, next) => {
  storeInit.then(next)
    .catch(e => {
      // Manage any errors that arise
    })
})

This approach ensures that if routing occurs before the complete loading of the store, the router will patiently wait.
In the event that routing takes place afterwards, the promise will have already been fulfilled and routing will progress smoothly.

Remember to employ techniques like conditional rendering to prevent displaying an empty screen while routing awaits data retrieval.

^*: By doing this, all routing and navigation activities are suspended during data retrieval processes. Exercise caution.

Answer 3

Answer №2

Ever since the initial inquiry, vue-router (v3.5.1) now offers a way to detect the first navigation, enabling actions like this to be executed exclusively on the initial route.

You can compare from with VueRouter.START_LOCATION.

import VueRouter from 'vue-router'

const router = new VueRouter({
  // ...
})

router.beforeEach((to, from, next) => {
  if (from === VueRouter.START_LOCATION) {
    // handle Vuex initialization/hydration during initial navigation.
    initializeOrWait().then((isLoggedIn) => {
      // adjust navigation or apply appropriate guard logic as needed.
      next();
    });
  } else {
    next();
  }
})

Answer 4

Ever since the initial inquiry, vue-router (v3.5.1) now offers a way to detect the first navigation, enabling actions like this to be executed exclusively on the initial route.

You can compare from with VueRouter.START_LOCATION.

import VueRouter from 'vue-router'

const router = new VueRouter({
  // ...
})

router.beforeEach((to, from, next) => {
  if (from === VueRouter.START_LOCATION) {
    // handle Vuex initialization/hydration during initial navigation.
    initializeOrWait().then((isLoggedIn) => {
      // adjust navigation or apply appropriate guard logic as needed.
      next();
    });
  } else {
    next();
  }
})

Answer 5

Answer №3

One successful approach I found was to encapsulate my Vue instance (new Vue({... })) within a .then() Promise. This promise would resolve(null) if everything goes smoothly, and it will resolve an error in case of any issues. This way, I can render the Vue instance conditionally based on the presence of an error.

Here, I invoke my asynchronous function and wait for it to load the store before initializing my app

My async function utilizes the token to fetch the required data

By following this method, the route guards that rely on the fetched store data can operate effectively

I hope this explanation is helpful, and please excuse any shortcomings in my English :)

Answer 6

One successful approach I found was to encapsulate my Vue instance (new Vue({... })) within a .then() Promise. This promise would resolve(null) if everything goes smoothly, and it will resolve an error in case of any issues. This way, I can render the Vue instance conditionally based on the presence of an error.

Here, I invoke my asynchronous function and wait for it to load the store before initializing my app

My async function utilizes the token to fetch the required data

By following this method, the route guards that rely on the fetched store data can operate effectively

I hope this explanation is helpful, and please excuse any shortcomings in my English :)

The best way to avoid routing before certain async data in the Vuex store has finished loading

Answer №1

Answer №2

Answer №3

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