Drop down menu 如何使用bootstrap 3在导航栏菜单的下拉菜单项中创建嵌套下拉菜单？

朋友们

是否有机会使用bootsrap 3在下拉菜单项内创建嵌套下拉菜单（多级下拉菜单）？这就是我要做的。我可能在代码中的某个地方出错了，是吗？ 以下是html代码：

<nav class="navbar navbar-default">
    <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1"> <span class="sr-only">Toggle navigation</span>
 <span class="icon-bar"></span>
 <span class="icon-bar"></span>
 <span class="icon-bar"></span>
        </div>
        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">

            <ul class="nav navbar-nav">
                <li class="dropdown"> 
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown <span class="caret"></span></a>

                    <ul class="dropdown-menu" role="menu">
                        <li class="dropdown">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown2 <span class="caret"></span></a>

                            <ul class="dropdown-menu" role="menu">
                                <li ><a href="#" >Something</a>
                                </li>
                                <li><a href="#">Another action</a>
                                </li>
                                <li><a href="#">Something else here</a>
                                </li>
                                <li class="divider"></li>
                                <li><a href="#">Separated link</a>
                                </li>
                            </ul>
                        </li>
                        <li><a href="#">Another action</a>
                        </li>
                        <li><a href="#">Something else here</a>
                        </li>
                        <li class="divider"></li>
                        <li><a href="#">Separated link</a>
                        </li>
                    </ul>
                </li>
            </ul>
        </div>
        <!-- /.navbar-collapse -->
    </div>
    <!-- /.container-fluid -->
</nav>

切换导航

---

嵌套的“Dropdown2”菜单项不能像其父菜单项“Dropdown”那样打开。

将所有粗体内容添加到代码中

  <ul class="dropdown-menu" role="menu"  **onclick="event.stopPropagation();"**>
   <li class="dropdown" **id="test"**>
     <a href="#" class="dropdown-toggle" **id="test1"** data-toggle="dropdown" role="button">Dropdown2 <span class="caret"></span></a>

默认情况下，当您单击“内部”下拉列表时，问题的原因将关闭。

---

在这里，我们将动态地将类添加到第二个下拉列表中。

再创建一个CSS文件并定义“下拉子菜单”类。 将此“下拉子菜单”类应用于内部“LI”标记，如下所示：

---

我将不胜感激

$( "#test1" ).click(function() {
        $(this).attr("aria-expanded", "true");
        $('#test').addClass("open");
    });

<ul class="nav navbar-nav">
            <li class="dropdown"> 
                <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown <span class="caret"></span></a>

                <ul class="dropdown-menu" role="menu">
                    <li class="dropdown dropdown-submenu">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown2 <span class="caret"></span></a>

                        <ul class="dropdown-menu" role="menu">
                            <li ><a href="#" >Something</a>
                            </li>
                            <li><a href="#">Another action</a>
                            </li>
                            <li><a href="#">Something else here</a>
                            </li>
                            <li class="divider"></li>
                            <li><a href="#">Separated link</a>
                            </li>
                        </ul>
                    </li>

   .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 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:#333333;
margin-top:5px;
margin-right:-10px; } .dropdown-submenu:hover>a:after {
border-left-color: #999999; } .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; }