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Intersection Observer Hook
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| import { useEffect } from 'react'; | |
| // This customEffect will invoke the callback immediately when the element mention in ref is with viewport i.e. root | |
| // intersectionRatio >= 0.1 implies execute callback as soon as element is in view port | |
| const useVisibility = (ref, callback, options = {}) => { | |
| const { root = null, rootMargin = '0px' } = options; | |
| useEffect(() => { | |
| if (window.IntersectionObserver) { | |
| const observer = new IntersectionObserver(([entry]) => { | |
| if (entry.intersectionRatio >= 0.1) { | |
| callback(); | |
| observer.unobserve(entry.target); | |
| observer.disconnect(); | |
| } | |
| }, { | |
| root, | |
| rootMargin, | |
| threshold: [0.1] | |
| }); | |
| if (ref.current) { | |
| observer.observe(ref.current); | |
| } | |
| } else { | |
| callback(); | |
| } | |
| }, []); | |
| }; | |
| export default useVisibility; |
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