Skip to content

Files

Latest commit

 

History

History
71 lines (64 loc) · 3.89 KB

useInfiniteQuery.md

File metadata and controls

71 lines (64 loc) · 3.89 KB
id title
useInfiniteQuery
useInfiniteQuery
 
const {
  fetchNextPage,
  fetchPreviousPage,
  hasNextPage,
  hasPreviousPage,
  isFetchingNextPage,
  isFetchingPreviousPage,
  ...result
} = useInfiniteQuery({
  queryKey,
  queryFn: ({ pageParam = 1 }) => fetchPage(pageParam),
  ...options,
  getNextPageParam: (lastPage, allPages) => lastPage.nextCursor,
  getPreviousPageParam: (firstPage, allPages) => firstPage.prevCursor,
})

Options

The options for useInfiniteQuery are identical to the useQuery hook with the addition of the following:

  • queryFn: (context: QueryFunctionContext) => Promise<TData>
    • Required, but only if no default query function has been defined defaultQueryFn
    • The function that the query will use to request data.
    • Receives a QueryFunctionContext
    • Must return a promise that will either resolve data or throw an error.
    • Make sure you return the data and the pageParam if needed for use in the props below.
  • getNextPageParam: (lastPage, allPages) => unknown | undefined
    • When new data is received for this query, this function receives both the last page of the infinite list of data and the full array of all pages.
    • It should return a single variable that will be passed as the last optional parameter to your query function.
    • Return undefined to indicate there is no next page available.
  • getPreviousPageParam: (firstPage, allPages) => unknown | undefined
    • When new data is received for this query, this function receives both the first page of the infinite list of data and the full array of all pages.
    • It should return a single variable that will be passed as the last optional parameter to your query function.
    • Return undefined to indicate there is no previous page available.

Returns

The returned properties for useInfiniteQuery are identical to the useQuery hook, with the addition of the following and a small difference in isRefetching:

  • data.pages: TData[]
    • Array containing all pages.
  • data.pageParams: unknown[]
    • Array containing all page params.
  • isFetchingNextPage: boolean
    • Will be true while fetching the next page with fetchNextPage.
  • isFetchingPreviousPage: boolean
    • Will be true while fetching the previous page with fetchPreviousPage.
  • fetchNextPage: (options?: FetchNextPageOptions) => Promise<UseInfiniteQueryResult>
    • This function allows you to fetch the next "page" of results.
    • options.pageParam: unknown allows you to manually specify a page param instead of using getNextPageParam.
    • options.cancelRefetch: boolean if set to true, calling fetchNextPage repeatedly will invoke fetchPage every time, whether the previous invocation has resolved or not. Also, the result from previous invocations will be ignored. If set to false, calling fetchNextPage repeatedly won't have any effect until the first invocation has resolved. Default is true.
  • fetchPreviousPage: (options?: FetchPreviousPageOptions) => Promise<UseInfiniteQueryResult>
    • This function allows you to fetch the previous "page" of results.
    • options.pageParam: unknown allows you to manually specify a page param instead of using getPreviousPageParam.
    • options.cancelRefetch: boolean same as for fetchNextPage.
  • hasNextPage: boolean
    • This will be true if there is a next page to be fetched (known via the getNextPageParam option).
  • hasPreviousPage: boolean
    • This will be true if there is a previous page to be fetched (known via the getPreviousPageParam option).
  • isRefetching: boolean
    • Is true whenever a background refetch is in-flight, which does not include initial loading or fetching of next or previous page
    • Is the same as isFetching && !isLoading && !isFetchingNextPage && !isFetchingPreviousPage