useInfiniteQuery

function useInfiniteQuery<TQueryFnData, TError, TData, TQueryKey, TPageParam>(options, queryClient?): DefinedUseInfiniteQueryResult<TData, TError>;

import { For } from 'solid-js'
import { useInfiniteQuery } from '@tanstack/solid-query'

function Projects() {
  // `projectsQuery.data` is never `undefined`, thanks to `initialData` — even if a refetch fails, so the
  // list stays visible alongside the error.
  const projectsQuery = useInfiniteQuery(() => ({
    queryKey: ['projects'],
    queryFn: ({ pageParam }) => fetchProjects(pageParam),
    initialPageParam: 0,
    getNextPageParam: (lastPage) => lastPage.nextId,
    initialData: { pages: [], pageParams: [] },
  }))

  return (
    <div>
      {projectsQuery.isError ? <span>Error: {projectsQuery.error.message}</span> : null}
      <ul>
        <For each={projectsQuery.data.pages}>
          {(page) => <For each={page.projects}>{(p) => <li>{p.name}</li>}</For>}
        </For>
      </ul>
    </div>
  )
}

function useInfiniteQuery<TQueryFnData, TError, TData, TQueryKey, TPageParam>(options, queryClient?): UseInfiniteQueryResult<TData, TError>;

import { For, Match, Switch } from 'solid-js'
import { useInfiniteQuery } from '@tanstack/solid-query'

function Projects() {
  const projectsQuery = useInfiniteQuery(() => ({
    queryKey: ['projects'],
    queryFn: ({ pageParam }) => fetchProjects(pageParam),
    initialPageParam: 0,
    getNextPageParam: (lastPage) => lastPage.nextId,
  }))

  return (
    <Switch>
      <Match when={projectsQuery.isPending}>Loading...</Match>
      <Match when={projectsQuery.isError}>Error: {projectsQuery.error.message}</Match>
      <Match when={projectsQuery.isSuccess}>
        <ul>
          <For each={projectsQuery.data.pages}>
            {(page) => <For each={page.projects}>{(p) => <li>{p.name}</li>}</For>}
          </For>
        </ul>
        <button
          onClick={() => projectsQuery.fetchNextPage()}
          disabled={!projectsQuery.hasNextPage || projectsQuery.isFetching}
        >
          {projectsQuery.isFetchingNextPage
            ? 'Loading more...'
            : projectsQuery.hasNextPage
              ? 'Load More'
              : 'Nothing more to load'}
        </button>
      </Match>
    </Switch>
  )
}

import { For, Match, Switch, createEffect, onCleanup } from 'solid-js'
import { useInfiniteQuery } from '@tanstack/solid-query'

function Projects() {
  const projectsQuery = useInfiniteQuery(() => ({
    queryKey: ['projects'],
    queryFn: ({ pageParam }) => fetchProjects(pageParam),
    initialPageParam: 0,
    getNextPageParam: (lastPage) => lastPage.nextId,
  }))

  let sentinelRef: HTMLDivElement | undefined

  createEffect(() => {
    if (sentinelRef == null || !projectsQuery.hasNextPage || projectsQuery.isFetching) return

    const observer = new IntersectionObserver(([entry]) => {
      if (entry?.isIntersecting) projectsQuery.fetchNextPage()
    })
    observer.observe(sentinelRef)

    onCleanup(() => observer.disconnect())
  })

  return (
    <Switch>
      <Match when={projectsQuery.isPending}>Loading...</Match>
      <Match when={projectsQuery.isError}>Error: {projectsQuery.error.message}</Match>
      <Match when={projectsQuery.isSuccess}>
        <ul>
          <For each={projectsQuery.data.pages}>
            {(page) => <For each={page.projects}>{(p) => <li>{p.name}</li>}</For>}
          </For>
        </ul>
        <div ref={sentinelRef}>{projectsQuery.isFetchingNextPage ? 'Loading more...' : null}</div>
      </Match>
    </Switch>
  )
}