mirror of
https://github.com/nuxt/nuxt.git
synced 2024-11-14 10:04:05 +00:00
70 lines
2.1 KiB
Markdown
70 lines
2.1 KiB
Markdown
# `useNuxtData`
|
|
|
|
`useNuxtData` gives you access to the current cached value of [`useAsyncData`](/docs/api/composables/use-async-data) , `useLazyAsyncData`, [`useFetch`](/docs/api/composables/use-fetch) and [`useLazyFetch`](/docs/api/composables/use-lazy-fetch) with explicitly provided key.
|
|
|
|
## Type
|
|
|
|
```ts
|
|
useNuxtData<DataT = any> (key: string): { data: Ref<DataT | null> }
|
|
```
|
|
|
|
## Examples
|
|
|
|
### Show stale data while fetching in the background
|
|
|
|
The example below shows how you can use cached data as a placeholder while the most recent data is being fetched from the server.
|
|
|
|
```ts [archive.vue]
|
|
// We can access same data later using 'posts' key
|
|
const { data } = await useFetch('/api/posts', { key: 'posts' })
|
|
```
|
|
|
|
```ts [single.vue]
|
|
// Access to the cached value of useFetch in archive.vue
|
|
const { data: posts } = useNuxtData('posts')
|
|
|
|
const { data } = await useFetch(`/api/posts/${postId}`, {
|
|
key: `post-${postId}`,
|
|
default: () => {
|
|
// Find the individual post from the cache and set it as the default value.
|
|
return posts.value.find(post => post.id === postId)
|
|
}
|
|
})
|
|
```
|
|
|
|
### Optimistic Updates
|
|
|
|
We can leverage the cache to update the UI after a mutation, while the data is being invalidated in the background.
|
|
|
|
```ts [todos.vue]
|
|
// We can access same data later using 'todos' key
|
|
const { data } = await useFetch('/api/todos', { key: 'todos' })
|
|
```
|
|
|
|
```ts [add-todo.vue]
|
|
const newTodo = ref('')
|
|
const previousTodos = ref([])
|
|
|
|
// Access to the cached value of useFetch in todos.vue
|
|
const { data: todos } = useNuxtData('todos')
|
|
|
|
const { data } = await useFetch('/api/addTodo', {
|
|
key: 'addTodo',
|
|
method: 'post',
|
|
body: {
|
|
todo: newTodo.value
|
|
},
|
|
onRequest () {
|
|
previousTodos.value = todos.value // Store the previously cached value to restore if fetch fails.
|
|
|
|
todos.value.push(newTodo.value) // Optimistically update the todos.
|
|
},
|
|
onRequestError () {
|
|
todos.value = previousTodos.value // Rollback the data if the request failed.
|
|
},
|
|
async onResponse () {
|
|
await refreshNuxtData('todos') // Invalidate todos in the background if the request succeeded.
|
|
}
|
|
})
|
|
```
|