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html - css 在下拉列表中有另一个下拉列表

问题描述

我有这段代码

<li class="dropdown" runat="server" id="btn_logout">
  <a href="#" class="dropdown-toggle" data-toggle="dropdown"><i class="fa fa-user">USER</i> <b class="caret"></b></a>
  <ul class="dropdown-menu" style="background-color:black;">
    <li class="dropdown-header">DROPDOWN HERE: </li>
    <li><a href="#">Manage Account</a></li>
    <li role="separator" class="divider"></li>
    <li><a href="logout.php">Sign Out</a></li>
  </ul>
</li>

我想在它说的地方有另一个下拉菜单drop down here。我怎样才能做到这一点？

标签： htmlcsstwitter-bootstrap-3drop-down-menu

解决方案

简短的回答，引导程序不支持子菜单。

（TLDR）您可能想象到有一些技巧：

.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;
}
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>


<li class="dropdown" runat="server" id="btn_logout">
  <a href="#" class="dropdown-toggle" data-toggle="dropdown"><i class="fa fa-user">USER</i> <b class="caret"></b></a>
  <ul class="dropdown-menu" style="background-color:black;">
    <li class="dropdown-submenu">
      <a class="dropdown-item" href="#">another level</a>
      <ul class="dropdown-menu" style="background-color:black;">
        <li><a href="#">Manage Account</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="logout.php">Sign Out</a></li>
      </ul>
    </li>
    <li><a href="#">Manage Account</a></li>
    <li role="separator" class="divider"></li>
    <li><a href="logout.php">Sign Out</a></li>
  </ul>
</li>

资源

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