原生 HTML/CSS/JS 实现右键菜单和二级菜单

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文章源地址：https://www.huhailong.vip/article/1764653112011841538

Demo效果演示地址
先看效果图
{{{width=“auto” height=“auto”}}}

需要注意的就是边界检测处理，到极端点击底部和右侧时如果不做处理会遮挡菜单，影响使用，我的解决方案是动态监测窗口的宽高，根据右击时的横纵坐标判断菜单的最终位置，如果右击的纵坐标+菜单高度 >= 窗口高度则将菜单显示的高度坐标定位菜单高度，防止下方遮挡，如果右击的横坐标+菜单宽度 >= 窗口的宽度则菜单横坐标为窗口宽度减去两倍的窗口宽度，避免菜单遮挡。

完整代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>右键菜单</title>
    <!-- 阿里图标 -->
    <!-- <link rel="stylesheet" type="text/css" href="//at.alicdn.com/t/c/font_4453355_yizetjv4jeo.css" /> -->
    <style>
        html,
        body {
            margin: 0;
            overflow: hidden;
            width: 100%;
        }

        #test-area {
            border: 1px solid black;
            width: 100%;
            height: 100vh;
            background-color: #333333;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .menu {
            width: 200px;
            display: flex;
            flex-direction: column;
            position: absolute;
            border: 1px solid gray;
            background-color: #333333;
            color: white;
            border-radius: 4px;
            font-size: 14px;
        }

        .menu>ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .menu>ul>li {
            padding: 10px;
            cursor: pointer;
        }

        .menu>ul>li:hover {
            background-color: #1A6CE7;
        }

        hr {
            margin: 0;
            border: 1px solid gray;
        }

        .submenu {
            padding: 0;
            left: 200px;
            margin-top: -32px;
            position: absolute;
            display: none;
        }

        .link {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .iconfont {
            font-size: 14px;
            padding-right: 5px;
        }

        .tip {
            font-size: 40px;
            color: gray;
        }
    </style>
</head>

<body>
    <!-- 右键点击测试区域 -->
    <div id="test-area">
        <div class="tip">
            点击右键查看效果
        </div>
    </div>
    <!-- 右键菜单1 -->
    <div class="menu" id="right-menu" hidden>
        <ul>
            <li><i class="iconfont icon-chakan1"></i>查看详情</li>
            <li><i class="iconfont icon-chakanziduan"></i>打开表字段提示</li>
            <hr />
            <li><i class="iconfont icon-chakansql"></i>在SQL编辑器查看数据</li>
            <li><i class="iconfont icon-a-Property1shengchengshuju"></i>生成测试数据</li>
            <li><i class="iconfont icon-jurassic_export-data"></i>导出数据</li>
            <li><i class="iconfont icon-jurassic_import-data"></i>导入数据</li>
            <li><i class="iconfont icon-shujuqianyi_huaban"></i>数据迁移</li>
            <li><i class="iconfont icon-biaogeduibi"></i>表结构对比</li>
            <hr />
            <li id="generate-sql">
                <div class="link">
                    <span><i class="iconfont icon-shengchengSQL"></i>生成SQL</span>
                    <span>></span>
                </div>
                <div class="submenu menu" id="right-menu2">
                    <ul>
                        <li>查找</li>
                        <li>插入</li>
                        <li>更新</li>
                        <li>删除</li>
                        <li>DDL</li>
                    </ul>
                </div>
            </li>
            <li id="copy">
                <div class="link">
                    <span><i class="iconfont icon-fuzhi"></i>复制</span>
                    <span>></span>
                </div>
                <div class="submenu menu" id="right-menu3">
                    <ul>
                        <li>Insert语句</li>
                        <li>CVS语句</li>
                    </ul>
                </div>
            </li>
            <li><i class="iconfont icon-shanchu"></i>删除</li>
            <li><i class="iconfont icon-zhongmingming"></i>重命名</li>
            <hr />
            <li><i class="iconfont icon-shuaxin"></i>刷新</li>
        </ul>
    </div>
    <script>


        //获取窗口内部大小
        var width = window.innerWidth;
        var height = window.innerHeight;

        //用于重新计算窗口大小
        window.addEventListener('resize', ()=>{
            width = window.innerWidth;
            height = window.innerHeight;
        })

        //默认隐藏右键菜单
        hiddenRightMenu('right-menu');
        document.getElementById("test-area").addEventListener('contextmenu', (e) => {
            e.preventDefault(e);    //覆盖原生右键事件
            showRightMenu(e, 'right-menu');   //显示菜单
        })
        document.getElementById("test-area").addEventListener('click', (e) => {
            hiddenRightMenu('right-menu');
        })
        function showRightMenu(e, id) {
            var rightMenu = document.getElementById(id);
            if(e.clientY + 520 >= height){
                rightMenu.style.top = (height - 530) + "px";
            }else{
                rightMenu.style.top = e.clientY + "px";
            }
            if(e.clientX + 200 >= width){
                rightMenu.style.left = (width - 400) + "px";
            }else{
                rightMenu.style.left = e.clientX + "px";
            }
            // rightMenu.style.left = e.clientX + "px";
            // rightMenu.style.top = e.clientY + "px";
            rightMenu.style.display = 'block';
        }
        function hiddenRightMenu(id) {
            document.getElementById(id).style.display = 'none';
        }
        //二级菜单事件
        document.getElementById('generate-sql').addEventListener('mouseover', (e) => {
            document.getElementById('right-menu2').style.display = 'block';
        })
        document.getElementById('generate-sql').addEventListener('mouseout', (e) => {
            document.getElementById('right-menu2').style.display = 'none';
        })
        document.getElementById('copy').addEventListener('mouseover', (e) => {
            document.getElementById('right-menu3').style.display = 'block';
        })
        document.getElementById('copy').addEventListener('mouseout', (e) => {
            document.getElementById('right-menu3').style.display = 'none';
        })
    </script>
</body>

</html>