Created
February 19, 2019 17:35
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Composing Behavior with React hooks - useHover
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| import { useState, useRef, useEffect } from "react"; | |
| export default function useHover() { | |
| const [isHovered, setIsHovered] = useState(false); | |
| const hoverRef = useRef(null); | |
| const handleMouseOver = () => setIsHovered(true); | |
| const handleMouseOut = () => setIsHovered(false); | |
| useEffect( | |
| () => { | |
| const elem = hoverRef.current; | |
| if (elem) { | |
| elem.addEventListener("mouseover", handleMouseOver); | |
| elem.addEventListener("mouseout", handleMouseOut); | |
| return () => { | |
| elem.removeEventListener("mouseover", handleMouseOver); | |
| elem.removeEventListener("mouseout", handleMouseOut); | |
| }; | |
| } | |
| }, | |
| [hoverRef.current] | |
| ); // Recall only if ref changes | |
| return [hoverRef, isHovered]; | |
| } |
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