# Window Focus Refetching

If a user leaves your application and returns and the query data is stale, **TanStack Query automatically requests fresh data for you in the background**. You can disable this globally or per-query using the `refetchOnWindowFocus` option:

#### Disabling Globally



```ts
export const appConfig: ApplicationConfig = {
  providers: [
    provideTanStackQuery(
      new QueryClient({
        defaultOptions: {
          queries: {
            refetchOnWindowFocus: false, // default: true
          },
        },
      }),
    ),
  ],
}
```



#### Disabling Per-Query



```ts
injectQuery(() => ({
  queryKey: ['todos'],
  queryFn: fetchTodos,
  refetchOnWindowFocus: false,
}))
```



## Custom Window Focus Event

In rare circumstances, you may want to manage your own window focus events that trigger TanStack Query to revalidate. To do this, TanStack Query provides a `focusManager.setEventListener` function that supplies you the callback that should be fired when the window is focused and allows you to set up your own events. When calling `focusManager.setEventListener`, the previously set handler is removed (which in most cases will be the default handler) and your new handler is used instead. For example, this is the default handler:



```tsx
focusManager.setEventListener((handleFocus) => {
  // Listen to visibilitychange
  if (typeof window !== 'undefined' && window.addEventListener) {
    const visibilitychangeHandler = () => {
      handleFocus(document.visibilityState === 'visible')
    }
    window.addEventListener('visibilitychange', visibilitychangeHandler, false)
    return () => {
      // Be sure to unsubscribe if a new handler is set
      window.removeEventListener('visibilitychange', visibilitychangeHandler)
    }
  }
})
```





## Managing focus state



```tsx
import { focusManager } from '@tanstack/angular-query-experimental'

// Override the default focus state
focusManager.setFocused(true)

// Fallback to the default focus check
focusManager.setFocused(undefined)
```