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

id, title

id	title
useIsFetching	useIsFetching

function useIsFetching(
   host,
   filters,
   queryClient?): IsFetchingAccessor;

Defined in: packages/lit-query/src/useIsFetching.ts:147

Creates a Lit reactive controller that tracks how many matching queries are currently fetching.

When filters is a function, it is re-read during host updates so the count can follow reactive host state. If queryClient is omitted, the controller resolves the client from the nearest connected QueryClientProvider.

Parameters

host

ReactiveControllerHost

The Lit reactive controller host that owns the cache subscription.

filters

Accessor<QueryFilters<readonly unknown[]>> = {}

Query filters, or a getter that returns query filters.

queryClient?

QueryClient

Optional explicit query client. Provide this for controllers that should not resolve a client from Lit context.

Returns

IsFetchingAccessor

An accessor for the current number of matching fetching queries.

Example

import { LitElement, html } from 'lit'
import { useIsFetching } from '@tanstack/lit-query'

class TodosStatus extends LitElement {
  private readonly todosFetching = useIsFetching(this, {
    queryKey: ['todos'],
  })

  render() {
    return html`<span>${this.todosFetching()} active todo fetches</span>`
  }
}