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React component: detect when focus has been lost
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| import React, { useRef, useEffect } from 'react'; | |
| /** | |
| * Example: | |
| * const [open, setOpen] = useState(false); | |
| * ... | |
| * <ClickOutside onBlur={() => setOpen(false)}> | |
| * <MyDropdown open={open}/> | |
| * </ClickOutsie> | |
| */ | |
| function ClickOutside({ children, onBlur }) { | |
| /* Set the wrapper ref */ | |
| const wrapperRef = useRef(null); | |
| /* Alert if clicked on outside of element */ | |
| const handleClickOutside = event => { | |
| if ( | |
| wrapperRef && | |
| wrapperRef.current && | |
| !wrapperRef.current.contains(event.target) | |
| ) { | |
| onBlur && onBlur(); | |
| } | |
| }; | |
| useEffect(() => { | |
| document.addEventListener('mousedown', handleClickOutside); | |
| return () => document.removeEventListener('mousedown', handleClickOutside); | |
| }, []); | |
| return <div ref={wrapperRef}>{children}</div>; | |
| } | |
| export default ClickOutside; |
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