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python测试开发django-190.bootstrap3 多级下拉菜单实现

作者：互联网

前言

bootstrap3 实现下拉菜单非常方便，但是没提供多级下拉菜单的实现方式。

下拉菜单

把下拉菜单放到一个div，设置class属性.dropdown, 按钮设置属性data-toggle="dropdown",菜单项ul设置.dropdown-menu 属性
就可以实现一个下拉菜单

<div class="dropdown">
  <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
    Dropdown
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
    <li><a href="#">Action</a></li>
    <li><a href="#">Another action</a></li>
    <li><a href="#">Something else here</a></li>
    <li role="separator" class="divider"></li>
    <li><a href="#">Separated link</a></li>
  </ul>
</div>

多层级下拉菜单

多级菜单实现效果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>多级菜单</title>
    <!-- 引入 css -->
    <link rel="stylesheet" type="text/css" href="/static/bootstrap3.4/css/bootstrap.min.css" >
    <!-- 引入 js jquery必须先引入 -->
    <script type="text/javascript" src="/static/jquery-3.2.1/jquery-3.2.1.js"></script>
    <script type="text/javascript" src="/static/bootstrap3.4/js/bootstrap.min.js"></script>
    <style type="text/css">
        .dropdown-submenu {
            position: relative;
        }
        
        .dropdown-submenu > .dropdown-menu {
            top: 0;
            left: 100%;
            margin-top: -6px;
            margin-left: -1px;
            -webkit-border-radius: 0 6px 6px 6px;
            -moz-border-radius: 0 6px 6px;
            border-radius: 0 6px 6px 6px;
        }

        .dropdown-submenu:hover > .dropdown-menu {
            display: block;
        }

        .dropdown-submenu > a:after {
            display: block;
            content: " ";
            float: right;
            width: 0;
            height: 0;
            border-color: transparent;
            border-style: solid;
            border-width: 5px 0 5px 5px;
            border-left-color: #ccc;
            margin-top: 5px;
            margin-right: -10px;
        }

        .dropdown-submenu:hover > a:after {
            border-left-color: #fff;
        }

        .dropdown-submenu.pull-left {
            float: none;
        }

        .dropdown-submenu.pull-left > .dropdown-menu {
            left: -100%;
            margin-left: 10px;
            -webkit-border-radius: 6px 0 6px 6px;
            -moz-border-radius: 6px 0 6px 6px;
            border-radius: 6px 0 6px 6px;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="row">
            <h2>Bootstrap 3多级下拉菜单</h2>
            <hr>
            <div class="dropdown">
                <a id="dLabel" role="button" data-toggle="dropdown" class="btn btn-primary" data-target="#"
                   href="javascript:;">
                    下拉多级菜单 <span class="caret"></span>
                </a>
                <ul class="dropdown-menu multi-level" role="menu" aria-labelledby="dropdownMenu">
                    <li><a href="javascript:;">一级菜单</a></li>
                    <li><a href="javascript:;">一级菜单</a></li>
                    <li class="divider"></li>
                    <li class="dropdown-submenu">
                        <a tabindex="-1" href="javascript:;">一级菜单</a>
                        <ul class="dropdown-menu">
                            <li><a tabindex="-1" href="javascript:;">二级菜单</a></li>
                            <li class="divider"></li>
                            <li class="dropdown-submenu">
                                <a href="javascript:;">二级菜单</a>
                                <ul class="dropdown-menu">
                                    <li><a href="javascript:;">三级菜单</a></li>
                                </ul>
                            </li>
                        </ul>
                    </li>
                </ul>
            </div>
    
        </div>
    </div>
</body>
</html>

标签：菜单,dropdown,python,6px,190,border,下拉菜单,left
来源： https://www.cnblogs.com/yoyoketang/p/16181014.html