---
id: window-focus-refetching
title: 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

[//]: # 'Example'

```tsx
//
const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      refetchOnWindowFocus: false, // default: true
    },
  },
})

function App() {
  return <QueryClientProvider client={queryClient}>...</QueryClientProvider>
}
```

[//]: # 'Example'

#### Disabling Per-Query

[//]: # 'Example2'

```tsx
useQuery({
  queryKey: ['todos'],
  queryFn: fetchTodos,
  refetchOnWindowFocus: false,
})
```

[//]: # 'Example2'

## 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:

[//]: # 'Example3'

```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)
    }
  }
})
```

[//]: # 'Example3'
[//]: # 'ReactNative'

## Managing Focus in React Native

Instead of event listeners on `window`, React Native provides focus information through the [`AppState` module](https://reactnative.dev/docs/appstate#app-states). You can use the `AppState` "change" event to trigger an update when the app state changes to "active":

```tsx
import { AppState } from 'react-native'
import { focusManager } from '@tanstack/react-query'

function onAppStateChange(status: AppStateStatus) {
  if (Platform.OS !== 'web') {
    focusManager.setFocused(status === 'active')
  }
}

useEffect(() => {
  const subscription = AppState.addEventListener('change', onAppStateChange)

  return () => subscription.remove()
}, [])
```

[//]: # 'ReactNative'

## Managing focus state

[//]: # 'Example4'

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

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

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

[//]: # 'Example4'