upstream-tanstack-query/docs/framework/svelte/reference/functions/useIsFetching.md

id, title

id	title
useIsFetching	useIsFetching

function useIsFetching(filters?, queryClient?): ReactiveValue<number>;

Defined in: packages/svelte-query/src/useIsFetching.svelte.ts:40

Parameters

filters?

QueryFilters<readonly unknown[]>

QueryFilters to narrow down which queries to count. Omit to count every fetching query.

queryClient?

QueryClient

Use this to use a custom QueryClient. Otherwise, the one from the nearest context will be used.

Returns

ReactiveValue<number>

A reactive value — read .current to get how many matching queries are currently fetching.

Examples

<script lang="ts">
  import { useIsFetching } from '@tanstack/svelte-query'

  // How many queries matching the posts prefix are fetching?
  const isFetchingPosts = useIsFetching({ queryKey: ['posts'] })
</script>

{#if isFetchingPosts.current}
  <span>Refreshing posts...</span>
{/if}

A global loading indicator for any query fetching in the background, not just the ones on screen:

<script lang="ts">
  import { useIsFetching } from '@tanstack/svelte-query'

  const isFetching = useIsFetching()
</script>

{#if isFetching.current}
  <div>Queries are fetching in the background...</div>
{/if}