Bootstrap 3下拉子菜单缺失 [英] Bootstrap 3 dropdown sub menu missing

问题描述

Bootstrap 3仍然在RC，但我只是试图实现它。我不知道如何放一个子菜单类。即使没有在css中的类，甚至新的文档不说任何东西。

Bootstrap 3 is still at RC, but I was just trying to implement it. I couldn't figure out how to put a sub menu class. Even there is no class in css and even the new docs don't say anything about it

它在2.x中有类名为dropdown-submenu

It was there in 2.x with class name as dropdown-submenu

推荐答案

在Bootstrap 3 RC中删除了 dropdown-submenu 用Bootstrap作者Mark Otto的话来说。

The dropdown-submenu has been removed in Bootstrap 3 RC. In the words of Bootstrap author Mark Otto..

子菜单现在没有太多的地方，特别是移动网络，他们将被删除与3.0 - https://github.com/twbs/bootstrap/pull/6342

但是，有了一些额外的CSS，你可以在3中获得相同的功能。

But, with a little extra CSS you can get the same functionality in 3.

以下是使用3.0 RC 1的示例： http://bootply.com/71520

Here is an example that uses 3.0 RC 1: http://bootply.com/71520

下面是一个使用Bootstrap 3.0.0（final）的示例： http://bootply.com/86684

Here is an example that uses Bootstrap 3.0.0 (final): http://bootply.com/86684

b $ b

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

标记样本

<div class="navbar navbar-default navbar-fixed-top" role="navigation">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">  
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
        </div>
        <div class="collapse navbar-collapse navbar-ex1-collapse">
            <ul class="nav navbar-nav">
                <li class="menu-item dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Drop Down<b class="caret"></b></a>
                    <ul class="dropdown-menu">
                        <li class="menu-item dropdown dropdown-submenu">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown">Level 1</a>
                            <ul class="dropdown-menu">
                                <li class="menu-item ">
                                    <a href="#">Link 1</a>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Level 2</a>
                                    <ul class="dropdown-menu">
                                        <li>
                                            <a href="#">Link 3</a>
                                        </li>
                                    </ul>
                                </li>
                            </ul>
                        </li>
                    </ul>
                </li>
            </ul>
        </div>
    </div>
</div>

- 在navbar中调整左侧位置的示例： http://bootply.com/92442

P.S. - Example in navbar that adjusts left position: http://bootply.com/92442

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