本页目录
后台获取指示器
一个查询的 status === 'pending' 状态足以显示查询的初始硬加载状态，但有时您可能希望显示一个额外的指示器，表明查询正在后台重新获取。为此，查询还为您提供了一个 isFetching 布尔值，您可以使用它来显示它处于获取状态，而无需考虑 status 变量的状态
vue
<script setup>
import { useQuery } from '@tanstack/vue-query'
const { isPending, isFetching, isError, data, error } = useQuery({
queryKey: ['todos'],
queryFn: getTodos,
})
</script>
<template>
<div v-if="isFetching">Refreshing...</div>
<span v-if="isPending">Loading...</span>
<span v-else-if="isError">Error: {{ error.message }}</span>
<!-- We can assume by this point that `isSuccess === true` -->
<ul v-else-if="data">
<li v-for="todo in data" :key="todo.id">{{ todo.title }}</li>
</ul>
</template>
<script setup>
import { useQuery } from '@tanstack/vue-query'
const { isPending, isFetching, isError, data, error } = useQuery({
queryKey: ['todos'],
queryFn: getTodos,
})
</script>
<template>
<div v-if="isFetching">Refreshing...</div>
<span v-if="isPending">Loading...</span>
<span v-else-if="isError">Error: {{ error.message }}</span>
<!-- We can assume by this point that `isSuccess === true` -->
<ul v-else-if="data">
<li v-for="todo in data" :key="todo.id">{{ todo.title }}</li>
</ul>
</template>
显示全局后台获取加载状态
除了单个查询加载状态之外，如果您想在任何查询正在获取（包括在后台）时显示全局加载指示器，则可以使用 useIsFetching 钩子
vue
<script setup>
import { useIsFetching } from '@tanstack/vue-query'
const isFetching = useIsFetching()
</script>
<template>
<div v-if="isFetching">Queries are fetching in the background...</div>
</template>
<script setup>
import { useIsFetching } from '@tanstack/vue-query'
const isFetching = useIsFetching()
</script>
<template>
<div v-if="isFetching">Queries are fetching in the background...</div>
</template>
