upstream-tanstack-query/docs/framework/angular/reference/functions/injectIsFetching.md

id, title

id	title
injectIsFetching	injectIsFetching

function injectIsFetching(filters?, options?): Signal<number>;

Defined in: packages/angular-query-experimental/src/inject-is-fetching.ts:63

Injects a signal that tracks the number of queries that your application is loading or fetching in the background (useful for app-wide loading indicators).

Parameters

filters?

QueryFilters<readonly unknown[]>

The QueryFilters to narrow down the matched queries.

options?

InjectIsFetchingOptions

Additional configuration

Returns

Signal<number>

A Signal with the number of queries that your application is currently loading or fetching in the background.

Examples

@Component({
  selector: 'posts-fetching-indicator',
  template: `
    @if (isFetchingPosts()) {
      <span>Refreshing posts...</span>
    }
  `,
})
export class PostsFetchingIndicator {
  // How many queries matching the posts prefix are fetching?
  readonly isFetchingPosts = injectIsFetching({ queryKey: ['posts'] })
}

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

@Component({
  selector: 'global-loading-indicator',
  template: `
    @if (isFetching()) {
      <div>Queries are fetching in the background...</div>
    }
  `,
})
export class GlobalLoadingIndicator {
  readonly isFetching = injectIsFetching()
}