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March 17, 2020 13:07
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Demo of helper hooks for automatic refetch on sort/pagination change
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const App = React.memo( | |
({ | |
node: { | |
items: { totalCount, ...items } | |
}, | |
relay | |
}) => { | |
const [fulltext, setFulltext] = useState('') | |
const fulltextDebounced = useDebounce(fulltext, 300) | |
const [{ sort, order }, updateSort] = useSort({ sort: 'name', order: 'asc' }) | |
const [{ first, offset }, paginationProps] = usePagination({ first: 25, offset: 0 }, totalCount) | |
const [fetching] = useAutoRefetch( | |
relay, | |
{ | |
sort, | |
order, | |
first, | |
offset, | |
fulltext: fulltextDebounced | |
} | |
) | |
return ( | |
// ...jsx | |
) | |
} | |
) |
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const useAutoRefetch = (relay, refetchVars, { onSuccess } = {}) => { | |
const [fetching, setFetching] = useState(false) | |
useEffect( | |
() => { | |
setFetching(true) | |
const request = relay.refetch( | |
prevVars => ({ | |
...prevVars, | |
...refetchVars | |
}), | |
undefined, | |
error => { | |
if (!error && typeof onSuccess === 'function') { | |
onSuccess(refetchVars) | |
} | |
setFetching(false) | |
} | |
) | |
return () => { | |
// cancel ongoing refetch when new starts | |
request.dispose() | |
} | |
}, | |
[...Object.values(refetchVars)] // "watch" refetch vars for change | |
) | |
return [fetching] | |
} |
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const usePagination = ({ first: initFirst, offset: initOffset }, totalCount) => { | |
const [{ page, numberOfRows }, updateRows] = useState(() => ({ | |
page: initOffset === 0 || totalCount === 0 || totalCount < initOffset ? 1 : initOffset / initFirst + 1, | |
numberOfRows: initFirst | |
})) | |
const offset = useMemo(() => (page - 1) * numberOfRows, [page, numberOfRows]) | |
useEffect( | |
() => { | |
// go to first page if the current page is empty | |
if (page > 1 && totalCount <= offset) { | |
updateRows(prevState => ({ | |
...prevState, | |
page: 1 | |
})) | |
} | |
}, | |
[totalCount, page, offset] | |
) | |
// props for my pagination component | |
const paginationProps = { | |
total: totalCount, | |
page, | |
numberOfRows, | |
updateRows | |
} | |
return [{ first: numberOfRows, offset }, paginationProps] | |
} |
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const useSort = initValues => { | |
const [{ sort, order }, updateSortState] = useState(initValues) | |
const changeSort = newSort => { | |
const newOrder = newSort === sort ? (order === 'asc' ? 'desc' : 'asc') : 'asc' | |
updateSortState({ sort: newSort, order: newOrder }) | |
} | |
return [{ sort, order }, changeSort] | |
} |
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