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Merge pull request #1483 from clpetersonucf/react/my-widgets-rework-a…
…gain [React branch] Improved pagination behavior in My Widgets
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| import { useState, useEffect, useMemo } from 'react' | ||
| import { useInfiniteQuery } from 'react-query' | ||
| import { apiGetWidgetInstances } from '../../util/api' | ||
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| export default function useInstanceList() { | ||
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| const [errorState, setErrorState] = useState(false) | ||
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| // Helper function to sort widgets | ||
| const _compareWidgets = (a, b) => { return (b.created_at - a.created_at) } | ||
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| // transforms data object returned from infinite query into one we can use in the my-widgets-page component | ||
| // this creates a flat list of instances from the paginated list that's subsequently sorted | ||
| const formatData = (list) => { | ||
| if (list?.type == 'error') { | ||
| console.error(`Widget instances failed to load with error: ${list.msg}`); | ||
| setErrorState(true) | ||
| return [] | ||
| } | ||
| if (list?.pages) { | ||
| let dataMap = [] | ||
| return [...dataMap.concat(...list.pages.map((page) => page.pagination))].sort(_compareWidgets) | ||
| } else return [] | ||
| } | ||
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| const getWidgetInstances = ({ pageParam = 0}) => { | ||
| return apiGetWidgetInstances(pageParam) | ||
| } | ||
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| const { | ||
| data, | ||
| error, | ||
| fetchNextPage, | ||
| hasNextPage, | ||
| isFetching, | ||
| isFetchingNextPage, | ||
| status, | ||
| } = useInfiniteQuery({ | ||
| queryKey: ['widgets'], | ||
| queryFn: getWidgetInstances, | ||
| getNextPageParam: (lastPage, pages) => lastPage.next_page, | ||
| refetchOnWindowFocus: false | ||
| }) | ||
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| useEffect(() => { | ||
| if (error != null && error != undefined) setErrorState(true) | ||
| },[error]) | ||
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| // memoize the instance list since this is a large, expensive query | ||
| const instances = useMemo(() => formatData(data), [data]) | ||
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| useEffect(() => { | ||
| if (hasNextPage) fetchNextPage() | ||
| },[instances]) | ||
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| return { | ||
| instances: instances, | ||
| isFetching: isFetching || hasNextPage, | ||
| ...(errorState == true ? {error: true} : {}) // the error value is only provided if errorState is true | ||
| } | ||
| } |
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