Html 如何在 Bootstrap 中制作 3 级折叠菜单？
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How to make a 3-level collapsing menu in Bootstrap?
提问by jens_vdp
I am trying to make a 3-level collapsing navbar menu for Bootstrap, but I can't open the third level.
我正在尝试为 Bootstrap 制作一个 3 级折叠导航栏菜单，但我无法打开第三级。
This is the two level menu which I have:
这是我拥有的两级菜单：
<link href="https://stackpath.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css" rel="stylesheet"/>
<div class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</a>
<div class="nav-collapse">
<ul class="nav">
<a class="brand" href="#">Present Ideas</a>
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Blog</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Help</a></li>
<li class="dropdown" id="accountmenu">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">Account Settings<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="#">Login</a></li>
<li><a href="#">Register</a></li>
<li class="divider"></li>
<li><a href="#">Logout</a></li>
</ul>
</li>
</ul>
<ul class="nav pull-right">
</ul>
</div>
<!--/.nav-collapse -->
</div>
</div>
</div>I thought something like this would work:
我认为这样的事情会起作用：
<link href="https://stackpath.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css" rel="stylesheet"/>
<div class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</a>
<div class="nav-collapse">
<ul class="nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Blog</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Help</a></li>
<li class="dropdown" id="accountmenu">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">Account Settings<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="#">Login</a></li>
<li class="item-148 dropdown parent">
<a href="/about/learn-more">Learn more <b class="caret-right"></b></a>
<ul class="dropdown-menu">
<li class="item-149"><a href="/about/learn-more/the-software">The Software</a></li>
<li class="item-150"><a href="/about/learn-more/the-project">The Project</a></li>
<li class="item-151"><a href="/about/learn-more/the-leadership">The Leadership</a></li>
<li class="item-152"><a href="/about/learn-more/open-source-matters">Open Source Matters</a></li>
</ul>
</li>
<li class="divider"></li>
<li><a href="#">Logout</a></li>
</ul>
</li>
</ul>
<ul class="nav pull-right">
</ul>
</div>
<!--/.nav-collapse -->
</div>
</div>
</div>But that's not working.
但这行不通。
回答by Zim
Bootstrap 2.3.x and later supports the dropdown-submenu..
Bootstrap 2.3.x 及更高版本支持dropdown-submenu..
<ul class="dropdown-menu">
<li><a href="#">Login</a></li>
<li class="dropdown-submenu">
<a tabindex="-1" href="#">More options</a>
<ul class="dropdown-menu">
<li><a tabindex="-1" href="#">Second level</a></li>
<li><a href="#">Second level</a></li>
<li><a href="#">Second level</a></li>
</ul>
</li>
<li><a href="#">Logout</a></li>
</ul>
回答by Tony
Bootstrap 3 dropped native support for nested collapsing menus, but there's a way to re-enable it with a 3rd party script. It's called SmartMenus. It means adding three new resources to your page, but it seamlessly supports Bootstrap 3.x with multiple levels of menus for nested <ul>/<li>elements with class="dropdown-menu". It automatically displays the proper caret indicator as well.
Bootstrap 3 放弃了对嵌套折叠菜单的原生支持，但有一种方法可以使用 3rd 方脚本重新启用它。它被称为SmartMenus。这意味着向您的页面添加三个新资源，但它无缝支持 Bootstrap 3.x，为<ul>/<li>带有class="dropdown-menu". 它还会自动显示正确的插入符指示符。
<head>
...
<script src=".../jquery.smartmenus.min.js"></script>
<script src=".../jquery.smartmenus.bootstrap.min.js"></script>
...
<link rel="stylesheet" href=".../jquery.smartmenus.bootstrap.min.css"/>
...
</head>
Here's a demo page: http://vadikom.github.io/smartmenus/src/demo/bootstrap-navbar-fixed-top.html
这是一个演示页面：http: //vadikom.github.io/smartmenus/src/demo/bootstrap-navbar-fixed-top.html
