Created
April 24, 2020 13:26
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Hook for checkbox functionality
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import React, {useCallback, useMemo} from 'react'; | |
export const useCheckbox = (allValues: string[], selected: string[], onChange: (newSelection: string[]) => void) => { | |
const selectedStatesObj = useMemo(() => (selected || []).reduce((p, c) => ({ | |
...p, | |
[c]: true | |
}), {} as {[id: string]: boolean}), [selected]); | |
const onAllChange = useCallback((event: React.ChangeEvent<HTMLInputElement>) => { | |
const selected = event.target.checked; | |
if (selected) { | |
onChange(allValues); | |
return; | |
} | |
onChange([]) | |
}, [onChange, allValues]); | |
const areAllChecked = useCallback(() => { | |
const keys = Object.keys(selectedStatesObj); | |
return keys.every(k => selectedStatesObj[k]) && keys.length === allValues.length && keys.every((cKey) => allValues.indexOf(cKey) >= 0); | |
}, [selectedStatesObj, allValues]); | |
const createOnChangeHandler = useCallback((key: string) => (e: React.ChangeEvent<HTMLInputElement>) => { | |
const checked = e.target.checked; | |
const newStates = {...selectedStatesObj, [key]: checked}; | |
onChange(Object.keys(newStates).reduce((p, c) => { | |
const v = newStates[c]; | |
if (v) { | |
return [...p, c] | |
} | |
return p | |
}, [] as string[])); | |
}, [onChange, selectedStatesObj]); | |
const isChecked = useCallback((k: string) => { | |
return selected.indexOf(k) > -1; | |
}, [selected]); | |
return { | |
createOnChangeHandler, | |
onAllChange, | |
areAllChecked, | |
isChecked, | |
} | |
}; |
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