左侧菜单栏折叠展开效果-超级简单
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参考技术A 分享一个常见于管理后台的左侧菜单栏折叠展开的效果，基于jquery，效果图如下：一：页面结构：
二：页面样式css，放在head标签里
三：引入jquery文件
四：给一级菜单绑定点击事件，点击时展开下面的子菜单
五：给二级菜单绑定事件，点击时加入选中的深色背景
六：阻止二级菜单点击发生冒泡，当点击二级菜单的时候，一级菜单的事件也会发生，此时二级菜单会被收起，因此需要阻止事件冒泡
原文作者技术博客： https://www.jianshu.com/u/ac4daaeecdfe
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当我编辑某些内容时，sb admin 2 菜单不会折叠
【中文标题】当我编辑某些内容时，sb admin 2 菜单不会折叠【英文标题】：sb admin 2 menu doesn't collapse when i edit some content 【发布时间】：2014-11-10 13:50:18 【问题描述】：我正在为此引导主题编辑一些内容：http://startbootstrap.com/template-overviews/sb-admin-2/
当我从 index.html 文件中删除一些内容时，左侧栏导航菜单已展开并且没有再次折叠。
这里是编辑后的 index.html 代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<title>SB Admin 2 - Bootstrap Admin Theme</title>
<!-- Bootstrap Core CSS -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- MetisMenu CSS -->
<link href="css/plugins/metisMenu/metisMenu.min.css" rel="stylesheet">
<!-- Timeline CSS -->
<link href="css/plugins/timeline.css" rel="stylesheet">
<!-- Custom CSS -->
<link href="css/sb-admin-2.css" rel="stylesheet">
<!-- Morris Charts CSS -->
<link href="css/plugins/morris.css" rel="stylesheet">
<!-- Custom Fonts -->
<link href="font-awesome-4.1.0/css/font-awesome.min.css" rel="stylesheet" type="text/css">
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
<script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div id="wrapper">
<!-- Navigation -->
<nav class="navbar navbar-default navbar-static-top" role="navigation" style="margin-bottom: 0">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="index.html">SB Admin v2.0</a>
</div>
<!-- /.navbar-header -->
<ul class="nav navbar-top-links navbar-right">
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">
<i class="fa fa-bell fa-fw"></i> <i class="fa fa-caret-down"></i>
</a>
<ul class="dropdown-menu dropdown-alerts">
<li>
<a href="#">
<div>
<i class="fa fa-comment fa-fw"></i> New Comment
<span class="pull-right text-muted small">4 minutes ago</span>
</div>
</a>
</li>
<li class="divider"></li>
<li>
<a href="#">
<div>
<i class="fa fa-twitter fa-fw"></i> 3 New Followers
<span class="pull-right text-muted small">12 minutes ago</span>
</div>
</a>
</li>
<li class="divider"></li>
<li>
<a href="#">
<div>
<i class="fa fa-envelope fa-fw"></i> Message Sent
<span class="pull-right text-muted small">4 minutes ago</span>
</div>
</a>
</li>
<li class="divider"></li>
<li>
<a href="#">
<div>
<i class="fa fa-tasks fa-fw"></i> New Task
<span class="pull-right text-muted small">4 minutes ago</span>
</div>
</a>
</li>
<li class="divider"></li>
<li>
<a href="#">
<div>
<i class="fa fa-upload fa-fw"></i> Server Rebooted
<span class="pull-right text-muted small">4 minutes ago</span>
</div>
</a>
</li>
<li class="divider"></li>
<li>
<a class="text-center" href="#">
<strong>See All Alerts</strong>
<i class="fa fa-angle-right"></i>
</a>
</li>
</ul>
<!-- /.dropdown-alerts -->
</li>
<!-- /.dropdown -->
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">
<i class="fa fa-user fa-fw"></i> <i class="fa fa-caret-down"></i>
</a>
<ul class="dropdown-menu dropdown-user">
<li><a href="#"><i class="fa fa-user fa-fw"></i> User Profile</a>
</li>
<li><a href="#"><i class="fa fa-gear fa-fw"></i> Settings</a>
</li>
<li class="divider"></li>
<li><a href="login.html"><i class="fa fa-sign-out fa-fw"></i> Logout</a>
</li>
</ul>
<!-- /.dropdown-user -->
</li>
<!-- /.dropdown -->
</ul>
<!-- /.navbar-top-links -->
<div class="navbar-default sidebar" role="navigation">
<div class="sidebar-nav navbar-collapse">
<ul class="nav" id="side-menu">
<li class="sidebar-search">
<div class="input-group custom-search-form">
<input type="text" class="form-control" placeholder="Search...">
<span class="input-group-btn">
<button class="btn btn-default" type="button">
<i class="fa fa-search"></i>
</button>
</span>
</div>
<!-- /input-group -->
</li>
<li>
<a class="active" href="index.html"><i class="fa fa-dashboard fa-fw"></i> Dashboard</a>
</li>
<li>
<a href="#"><i class="fa fa-bar-chart-o fa-fw"></i> Charts<span class="fa arrow"></span></a>
<ul class="nav nav-second-level">
<li>
<a href="#">Flot Charts</a>
</li>
<li>
<a href="#">Morris.js Charts</a>
</li>
</ul>
<!-- /.nav-second-level -->
</li>
<li>
<a href="#"><i class="fa fa-table fa-fw"></i> Tables</a>
</li>
<li>
<a href="#"><i class="fa fa-edit fa-fw"></i> Forms</a>
</li>
<li>
<a href="#"><i class="fa fa-wrench fa-fw"></i> UI Elements<span class="fa arrow"></span></a>
<ul class="nav nav-second-level">
<li>
<a href="#">Panels and Wells</a>
</li>
<li>
<a href="#">Buttons</a>
</li>
<li>
<a href="#">Notifications</a>
</li>
<li>
<a href="#">Typography</a>
</li>
<li>
<a href="#">Grid</a>
</li>
</ul>
<!-- /.nav-second-level -->
</li>
</ul>
</div>
<!-- /.sidebar-collapse -->
</div>
<!-- /.navbar-static-side -->
</nav>
<div id="page-wrapper">
<div class="row">
<div class="col-lg-12">
<h1 class="page-header">Dashboard</h1>
</div>
<!-- /.col-lg-12 -->
</div>
<!-- /.row -->
<div class="row">
<div class="col-lg-3 col-md-6">
<div class="panel panel-primary">
<div class="panel-heading">
<div class="row">
<div class="col-xs-3">
<i class="fa fa-comments fa-5x"></i>
</div>
<div class="col-xs-9 text-right">
<div class="huge">26</div>
<div>New Comments!</div>
</div>
</div>
</div>
<a href="#">
<div class="panel-footer">
<span class="pull-left">View Details</span>
<span class="pull-right"><i class="fa fa-arrow-circle-right"></i></span>
<div class="clearfix"></div>
</div>
</a>
</div>
</div>
<div class="col-lg-3 col-md-6">
<div class="panel panel-green">
<div class="panel-heading">
<div class="row">
<div class="col-xs-3">
<i class="fa fa-tasks fa-5x"></i>
</div>
<div class="col-xs-9 text-right">
<div class="huge">12</div>
<div>New Tasks!</div>
</div>
</div>
</div>
<a href="#">
<div class="panel-footer">
<span class="pull-left">View Details</span>
<span class="pull-right"><i class="fa fa-arrow-circle-right"></i></span>
<div class="clearfix"></div>
</div>
</a>
</div>
</div>
<div class="col-lg-3 col-md-6">
<div class="panel panel-yellow">
<div class="panel-heading">
<div class="row">
<div class="col-xs-3">
<i class="fa fa-shopping-cart fa-5x"></i>
</div>
<div class="col-xs-9 text-right">
<div class="huge">124</div>
<div>New Orders!</div>
</div>
</div>
</div>
<a href="#">
<div class="panel-footer">
<span class="pull-left">View Details</span>
<span class="pull-right"><i class="fa fa-arrow-circle-right"></i></span>
<div class="clearfix"></div>
</div>
</a>
</div>
</div>
<div class="col-lg-3 col-md-6">
<div class="panel panel-red">
<div class="panel-heading">
<div class="row">
<div class="col-xs-3">
<i class="fa fa-support fa-5x"></i>
</div>
<div class="col-xs-9 text-right">
<div class="huge">13</div>
<div>Support Tickets!</div>
</div>
</div>
</div>
<a href="#">
<div class="panel-footer">
<span class="pull-left">View Details</span>
<span class="pull-right"><i class="fa fa-arrow-circle-right"></i></span>
<div class="clearfix"></div>
</div>
</a>
</div>
</div>
</div>
<!-- /.row -->
</div>
<!-- /.row -->
</div>
<!-- /#page-wrapper -->
</div>
<!-- /#wrapper -->
<!-- jQuery Version 1.11.0 -->
<script src="js/jquery-1.11.0.js"></script>
<!-- Bootstrap Core JavaScript -->
<script src="js/bootstrap.min.js"></script>
<!-- Metis Menu Plugin JavaScript -->
<script src="js/plugins/metisMenu/metisMenu.min.js"></script>
<!-- Morris Charts JavaScript -->
<script src="js/plugins/morris/raphael.min.js"></script>
<script src="js/plugins/morris/morris.min.js"></script>
<script src="js/plugins/morris/morris-data.js"></script>
<!-- Custom Theme JavaScript -->
<script src="js/sb-admin-2.js"></script>
</body>
</html>
【问题讨论】：
您的标记是正确的并且仍然有效。 (jsfiddle.net/skjbc2u8) 你确定每个文件都真的可用吗？使用浏览器开发工具检查 404 错误或任何其他 js 错误。 除了 index.html 文件之外，我还没有更改任何内容，这就是为什么会出现此问题。图片来自我的浏览器：im69.gulfup.com/eajprp.png 这没有帮助。我使用了您在小提琴中发布的 html，您可以看到它有效，所以 js 文件一定有问题。您是否在控制台中遇到任何错误？ 所有 js 文件都已正确放置（我没有对它们做任何事情）。我在控制台中收到此错误：错误：找不到图形容器元素 127.0.0.1:8080/admin/sb-admin-2/sb-admin-2/js/plugins/morris/… 第 6 行 @WhiteOne 解决了问题？ 【参考方案1】：您必须从 index.html 的底部删除 <script src="js/plugins/morris/morris-data.js"></script>。
此文件包含来自演示预览的示例数据。由于您删除了这些图形 div 容器，因此脚本会因为找不到容器而引发错误。此错误会停止脚本执行，因此metis-menu 脚本不再起作用。
【讨论】：
谢谢。找不到问题 刚刚为我节省了数小时的调试时间。谢谢！【参考方案2】：我几乎要疯了。 检查文件 sb-admin-2.js
文件结尾：
var url = window.location;
var element = $('ul.nav a').filter(function()
return this.href == url || url.href.indexOf(this.href) == 0;
).addClass('active').parent().parent().addClass('in').parent();
if (element.is('li'))
element.addClass('active');
只注释了那部分代码 /* */
【讨论】：
你能澄清你的答案吗？注释掉那部分代码是什么意思？以上是关于左侧菜单栏折叠展开效果-超级简单的主要内容，如果未能解决你的问题，请参考以下文章