css实现树形可折叠菜单效果代码-html代码-BFW代码库

css实现树形可折叠菜单效果代码

代码语言：html

代码描述：css实现树形可折叠菜单效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

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

<head>

    <meta charset="UTF-8">



    <style>
        body {
            margin: 30px;
            font-family: sans-serif;
            background: white;
        }

        #fontSizeWrapper {
            font-size: 16px;
        }

        #fontSize {
            width: 100px;
            font-size: 1em;
        }

        /* ————————————————————–
  Tree core styles
*/
        .tree {
            margin: 1em;
        }

        .tree input {
            position: absolute;
            clip: rect(0, 0, 0, 0);
        }

        .tree input ~ ul {
            display: none;
        }

        .tree input:checked ~ ul {
            display: block;
        }

        /* ————————————————————–
  Tree rows
*/
        .tree li {
            line-height: 1.2;
            position: relative;
            padding: 0 0 1em 1em;
        }

        .tree ul li {
            padding: 1em 0 0 1em;
        }

        .tree > li:last-child {
            padding-bottom: 0;
        }

        /* ————————————————————–
  Tree labels
*/
        .tree_label {
            position: relative;
            display: inline-block;
            background: #fff;
        }

        label.tree_label {
            cursor: pointer;
        }

        label.tree_label:hover {
            color: #666;
        }

        /* ————————————————————–
  Tree expanded icon
*/
        label.tree_label:before {
            background: #000;
            color: #fff;
            position: relative;
            z-index: 1;
            float: left;
            margin: 0 1em 0 -2em;
            width: 1em;
            height: 1em;
            border-radius: 1em;
            content: '+';
            text-align: center;
            line-height: .9em;
        }

:checked ~ label.tree_label:before {
            content: '–';
        }

        /* ————————————————————–
  Tree branches
*/
        .tree li:before {
            position: absolute;
            top: 0;
            bottom: 0;
            left: -.5em;
            display: block;
            width: 0;
            border-left: 1px solid #777;
            content: "";
        }

        .tree_label:after {
            position: absolute;
            top: 0;
            left: -1.5em;
            display: block;
            height: 0.5em;
            width: 1em;
            border-bottom: 1px solid #777;
            border-left: 1px solid #777;
            border-radius: 0 0 0 .3em;
            content: '';
        }

        label.tree_label:after {
            border-bottom: 0;
        }

:checked ~ label.tree_label:after {
            border-radius: 0 .3em 0 0;
            border-top: 1px solid #777;
            border-right: 1px solid #777;
            border-bottom: 0;
            border-left: 0;
            bottom: 0;
            top: 0.5em;
            height: auto;
        }

        .tree li:last-child:before {
            height: 1em;
            bottom: auto;
        }

        .tree > li:last-child:before {
            display: none;
        }

        .tree_custom {
            display: block;
            background: #eee;
            padding: 1em;
            border-radius: 0.3em;
        }
    </style>


</head>

<body translate="no">
    <div id="fontSizeWrapper">
        <label for="fontSize">Font size</label>
        <input type="range" value="1" id="fontSize" step="0.5" min="0.5" max="5" />
    </div>
    <ul class="tree">
        <li>
            <input type="checkbox" checked="checked" id="c1" />
            <label class="tree_label" for="c1">Level 0</label>
            <ul>
                <li>
                    <input type="checkbox" checked="checked" id="c2" />
                    <label for="c2" class="tree_label">Level 1</label>
                    <ul>
                        <li><span class="tree_label">Level 2</span></li>
                        <li><span class="tree_label">Level 2</span></li>
                    </ul>
                </li>
               .........完整代码请登录后点击上方下载按钮下载查看