如何使Bootstrap 3下拉菜单默认情况下打开，当它在折叠的导航栏内时 [英] How to make a Bootstrap 3 dropdown menu open by default when it is inside a collapsed navbar

问题描述

我尝试在默认情况下打开折叠式导航栏时打开下拉菜单。 这是一个小提示以显示我的代码迄今。

I'm trying to make my dropdown menu open by default when my collapsed navbar is opened. Here is a fiddle to show my code so far.

目前，如果您在导航栏处于折叠状态时点击它，则会显示两个链接和一个下拉菜单。您必须再次单击才能打开下拉菜单。

Currently, if you click on the navbar when it's in a collapsed state, two links and a dropdown menu are revealed. You have to click again to open the dropdown menu.

我的目的是让默认情况下打开下拉菜单，并隐藏 a.dropdown-toggle 折叠导航栏已打开。打开折叠导航栏时的外观：

My aim is to make the dropdown menu open by default and hide the a.dropdown-toggle element when the collapsed navbar is opened. A visual of how I'd like it to look when the collapsed navbar is opened:

• 链接


• 链接


• 下拉菜单


• 操作


• >
  
• 
  
• 分隔链接


• 一个单独的链接

• Link
• Link
• Dropdown
• Action
• Another action
• Something else here
• Separated link
• One more separated link

我的第一个想法是在上使用 display：none a.dropdown-toggle ，但只是隐藏整个下拉菜单。希望有人可以提出一些建议。我对jQuery和CSS解决方案都开放。

My first thought was to use display: none on a.dropdown-toggle but that just hides the whole dropdown menu. Hoping someone can suggest something. I'm open to both jQuery and CSS solutions.

我的标记：

<nav class="navbar navbar-default" role="navigation">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" 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>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </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="active"><a href="#">Link</a></li>
        <li><a href="#">Link</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="#">Action</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>
            <li class="divider"></li>
            <li><a href="#">One more separated link</a></li>
          </ul>
        </li>
      </ul>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>

推荐答案

您可以为响应式移动显示添加css样式。
将其粘贴到您的css文件中：

You can add css style for responsive mobile display. paste it into your css file:

@media only screen and (max-width:480px){
    .dropdown-menu{
        display: block;
        position: static;
        background-color:transparent;
        border:0 none;
        box-shadow:none;
        margin-top:0;
        position:static;
        width:100%;
    }
    .navbar-nav .dropdown-menu > li > a, 
    .navbar-nav .dropdown-menu .dropdown-header {
        padding:5px 15px 5px 25px;
    }
    .navbar-nav .dropdown-menu > li > a{
        line-height:20px;
    }
    .navbar-default .navbar-nav .dropdown-menu > li > a{    
        color:#777;
    }
}

您可以在此处看到它： 演示jsfiddle

you can see it in its entirety here : Demo jsfiddle

希望有所帮助。

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