如何让我的下拉列表在容器内部和左侧打开

Question

我想知道如何让我的ul.dropdown在我的容器内和左侧。 我得到了我的第一个下拉菜单，使用左边覆盖引导 CSS：自动;

第二个下拉列表我无法让它从与第一个下拉列表相同的位置开始。

请参阅代码。 https://codepen.io/anon/pen/QZGrXx

<nav class="navbar navbar-default" role="navigation">     
</div>
<div class="container pd35">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#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>
</button>
<a class="navbar-brand" href="#">Brand</a>
</div>
<div class="collapse navbar-collapse" id="navbar-collapse-1">
<ul class="nav navbar-nav navbar-left">
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown
<b class="caret"></b>
</a>
<ul class="dropdown-menu leftauto">
<a>First</a>
<li>
<a href="#">Action 1</a>
</li>
<li>
<a href="#">Another action</a>
</li>
<li>
<a href="#">Something else here</a>
</li>
<li>
<a href="#">Separated link</a>
</li>                  
</ul>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown
<b class="caret"></b>
</a>
<ul class="dropdown-menu">
<li>
<a href="#"></a>
</li>
<li>
<a href="#"> action</a>
</li>
<li>
<a href="#"> else here</a>
</li>
<li>
<a href="#"> link</a>
</li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li>
<a href="#">Link</a>
</li>
<li>
<a href="#">Link</a>
</li>
<li>
<a href="#">Link</a>
</li>
</ul>
</div>
</div>
<!-- /.navbar-collapse -->
</nav>



.nav {
margin-bottom: 0;
}
.nav>li.dropdown.open {
position: static;
}
.nav>li.dropdown.open .dropdown-menu {
border: none;
box-shadow: none;
border-top: 1px solid #eaeaea;
}
.dropdown-menu>li {
}
.nav.navbar-nav {
float: right;
}
.navbar {
margin-bottom: 0px;
border-radius: 0;
border-bottom: 1px solid #eaeaea;
}
.dropdown-menu>li {
}
.dropdown-menu>li>a {
white-space: unset;
}
.navbar-brand {
transform: translateX(-50%);
left: 50%;
position: absolute;
}
.dropdown-menu {
background-color: blue;
}
.pd35 {
padding: 35px 0px;
}
.leftauto { 
left: auto !important;
}

上面的代码是为引导程序编写的导航 UI。

Answer 1

使用垂直弹性列

这

<div class="collapse navbar-collapse" id="navbar-collapse-1">
<ul class="nav navbar-nav navbar-left">

成为

<ul class="nav navbar-left flex-column">

Answer 2

试试这个

<div class="collapse navbar-collapse" id="navbar-collapse-1">
<ul class="nav navbar-nav navbar-left">
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown
<b class="caret"></b>
</a>
<ul class="dropdown-menu leftauto">
<a>First</a>
<li>
<a href="#">Action 1</a>
</li>
<li>
<a href="#">Another action</a>
</li>
<li>
<a href="#">Something else here</a>
</li>
<li>
<a href="#">Separated link</a>
</li>                  
</ul>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown
<b class="caret"></b>
</a>
<ul class="dropdown-menu pull-left leftauto">
<li>
<a href="#"></a>
</li>
<li>
<a href="#"> action</a>
</li>
<li>
<a href="#"> else here</a>
</li>
<li>
<a href="#"> link</a>
</li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li>
<a href="#">Link</a>
</li>
<li>
<a href="#">Link</a>
</li>
<li>
<a href="#">Link</a>
</li>
</ul>
</div>

在第二个下拉列表中。我猜自动模式软件重叠了，这left: auto !important;做到了诀窍.