使用jq实现二级菜单效果，jq下拉菜单效果

作者：鹏仔先生日期：2020-06-19 17:24:27浏览：3774分类：JavaScript

这个下拉菜单，一般大多数人都选择使用ui框架，但是也有人还是需要jq实现的，写个demo分享给大家

在线运行

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>jq实现下拉菜单效果</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        body{
            padding: 300px;
            box-sizing: border-box;
        }
        ul li {
            list-style: none;
        }
        .choose-input-box{
            width: 200px;
            position: relative;
            left: 0;
            border: 1px solid #d7dff2;
            background: #fff;
            box-sizing: border-box;
            box-shadow: 0 2px 5px rgba(0,0,0,.1);
        }
        .choose-input {
            width: 100%;
        }
        .choose-input input {
            color: #333333;
            font-size: 14px;
            width: 100%;
            height: 32px;
            line-height: 30px;
            border: 1px solid #d2d2d2;
            text-indent: 15px;
            box-sizing: border-box;
            outline: none;
        }
        .choose-input-ul {
            width: 100%;
            position: absolute;
            left: 0;
            top: 33px;
            z-index: 10;
            border: 1px solid #d7dff2;
            background: #fff;
            box-sizing: border-box;
            box-shadow: 0 2px 5px rgba(0,0,0,.1);
            border-top: none;
        }
        .choose-input-ul li {
            color: #666666;
            font-size: 14px;
            width: 100%;
            padding: 10px;
            box-sizing: border-box;
            cursor: pointer;
        }
        .choose-input-ul .active {
            color: #fff;
            background: #008df7;
        }
    </style>
</head>
<body>
    <div class="choose-input-box">
        <div class="choose-input">
            <input type="text" placeholder="请选择" value="" class="">
        </div>
        <ul class="choose-input-ul" style="display: none;">
            <li>第一条</li>
            <li>第二条</li>
            <li class="active">第三条</li>
            <li>第四条</li>
        </ul>
    </div>
</body>
</html>

<script>
    // 下拉菜单-内容点击收缩展开
    $('.choose-input').on('click',function(e){
        if ($(this).siblings('ul').css('display') == "none") {
            //展开
            $(this).siblings('ul').slideDown(300);
        }else{
            //收缩
            $(this).siblings('ul').slideUp(300);
        }
        e.stopPropagation();
    });

    // 选择菜单（不用写组织冒泡，所以选择后会自动隐藏）
    $(".choose-input-ul li").click(function(){
        $(this).addClass("active").siblings().removeClass("active");
        $(this).parent().siblings().children().val($(this).text());
    })

    // 点击页面任意区域隐藏所有的下拉菜单
    $(document).click(function(){
        $('.choose-input-ul').slideUp(300);
    })
// 鹏仔先生
// 前端共享博客 http://sharedbk.com
</script>

如果阻止冒泡报错，那就使用