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📜  检测 React 组件外部的点击 - 无论代码示例

📅  最后修改于: 2022-03-11 15:00:56.937000             🧑  作者: Mango

代码示例1
import React, { useRef, useEffect } from "react";

/**
 * Hook that alerts clicks outside of the passed ref
 */
function useOutsideAlerter(ref) {
    useEffect(() => {
        /**
         * Alert if clicked on outside of element
         */
        function handleClickOutside(event) {
            if (ref.current && !ref.current.contains(event.target)) {
                alert("You clicked outside of me!");
            }
        }

        // Bind the event listener
        document.addEventListener("mousedown", handleClickOutside);
        return () => {
            // Unbind the event listener on clean up
            document.removeEventListener("mousedown", handleClickOutside);
        };
    }, [ref]);
}

/**
 * Component that alerts if you click outside of it
 */
export default function OutsideAlerter(props) {
    const wrapperRef = useRef(null);
    useOutsideAlerter(wrapperRef);

    return 
{props.children}
; }