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Adjust isLoading/isFetching explanation #1340

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Jul 23, 2021
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Adjust isLoading/isFetching explanation #1340

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6 changes: 3 additions & 3 deletions docs/rtk-query/usage/queries.mdx
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Expand Up @@ -193,10 +193,10 @@ The auto-generated React hooks created by the React-specific version of `createA

For query endpoints, RTK Query maintains a semantic distinction between `isLoading` and `isFetching` in order to provide more flexibility with the derived information provided.

- `isLoading` refers to a query being in flight for the _first time_ for the given endpoint + query param combination. No data will be available at this time.
- `isFetching` refers to a query being in flight for the given endpoint + query param combination, but not necessarily for the first time. Data may be available from an earlier request at this time.
- `isLoading` refers to a query being in flight for the _first time_ for the given hook. No data will be available at this time.
- `isFetching` refers to a query being in flight for the given endpoint + query param combination, but not necessarily for the first time. Data may be available from an earlier request done by this hook, maybe with the previous query param.

This distinction allows for greater control when handling UI behavior. For example, `isLoading` can be used to display a skeleton while loading for the first time, while `isFetching` can be used to grey out old data when fetching subsequent requests when data is invalidated and re-fetched.
This distinction allows for greater control when handling UI behavior. For example, `isLoading` can be used to display a skeleton while loading for the first time, while `isFetching` can be used to grey out old data when changing from page 1 to page 2 or when data is invalidated and re-fetched.

```tsx title="Managing UI behavior with Query Loading States"
import { Skeleton } from './Skeleton'
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