Bootstrap 5(2023年更新)
添加一些JavaScript代码,以防止当父级下拉菜单处于打开状态时,子菜单关闭。这可以通过切换display:block
来完成...
let dropdowns = document.querySelectorAll('.dropdown-toggle')
dropdowns.forEach((dd)=>{
dd.addEventListener('click', function (e) {
var el = this.nextElementSibling
el.style.display = el.style.display==='block'?'none':'block'
})
})
Bootstrap 5 多级下拉菜单 - 点击
Bootstrap 5 多级下拉菜单 - 悬停
Bootstrap 5 多级下拉菜单 - 悬停和动画过渡效果
或者,您可以使用此 CSS-only 方法来创建导航栏下拉菜单...
.dropdown-submenu {
position: relative;
}
.dropdown-submenu .dropdown-menu {
top: 0;
left: 100%;
margin-top: -1px;
}
.navbar-nav li:hover > ul.dropdown-menu {
display: block;
}
Bootstrap 4(更新于2018年)
dropdown-submenu
在Bootstrap 3 RC中已被移除。用Bootstrap作者Mark Otto的话说..
"子菜单在当前网络环境下并不适用,特别是移动网络。它们将会在3.0中被删除" - https://github.com/twbs/bootstrap/pull/6342
但是,通过一点额外的CSS,您可以获得相同的功能。
鼠标悬停在导航栏子菜单上:
.navbar-nav li:hover > ul.dropdown-menu {
display: block;
}
.dropdown-submenu {
position:relative;
}
.dropdown-submenu>.dropdown-menu {
top:0;
left:100%;
margin-top:-6px;
}
Navbar子菜单下拉悬停
右对齐的Navbar子菜单下拉悬停
右对齐的Navbar子菜单下拉点击
Navbar无子菜单下拉悬停
Bootstrap 3
这里有一个使用 Bootstrap 3 的示例:https://codeply.com/p/T9FWGhhL0S
CSS
.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;
}
示例标记
<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>
附言 - 导航栏中调整左侧位置的示例:https://codeply.com/p/XEiERVGcmz
.dropdown-submenu:hover {background: #e2e1e1;}
- Eduardo MorallessetTimeout( , 100)
。 - Polv@skelly的解决方案很好,但在移动设备上无法工作,因为悬停状态不起作用。
我添加了一些JS代码,以恢复BS 2.3.2的行为。
PS:它将与您在此处获取的CSS一起工作:http://bootply.com/71520,尽管您可以注释掉以下部分:
CSS:
/*.dropdown-submenu:hover>.dropdown-menu{display:block;}*/
JS:
$('ul.dropdown-menu [data-toggle=dropdown]').on('click', function(event) {
// Avoid following the href location when clicking
event.preventDefault();
// Avoid having the menu to close when clicking
event.stopPropagation();
// If a menu is already open we close it
$('ul.dropdown-menu [data-toggle=dropdown]').parent().removeClass('open');
// opening the one you clicked on
$(this).parent().addClass('open');
});
结果可以在我的WordPress主题中找到(页面顶部):http://shprinkone.julienrenaux.fr/
$(this).closest(".dropdown-submenu").toggleClass("open");
,这将打开/关闭链接菜单项。为了在桌面上保持悬停状态,需要检查浏览器视口宽度,并且每个站点都会有所不同。 - edhedges截至今日 (2014年1月9日),Bootstrap 3仍不支持子菜单下拉。
我在谷歌上搜索关于响应式导航菜单的内容,发现这是我认为最好的解决方案。
它是智能菜单 http://www.smartmenus.org/
我希望这是任何想要具有多级子菜单的导航菜单的出路。
更新 2015-02-17 智能菜单现已完全支持 Bootstrap 元素样式的子菜单。更多信息请查看智能菜单网站。
使用Bootstrap 5,现在可以非常容易地实现下拉子菜单,无需使用任何javascript代码,这要归功于新的autoClose
选项和dropend
类。
在线演示:https://jsfiddle.net/b038kc2y/
.dropdown-menu .dropdown-menu {
top: -.5rem !important;
}
<div class="dropdown m-5">
<a class="btn btn-secondary dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-bs-toggle="dropdown" data-bs-auto-close="outside" aria-expanded="false">
Dropdown link
</a>
<ul class="dropdown-menu" aria-labelledby="dropdownMenuLink">
<li class="dropend">
<a class="dropdown-item" href="#" id="dropdownSubMenuLink" data-bs-toggle="dropdown" aria-expanded="false">Submenu Action</a>
<ul class="dropdown-menu" aria-labelledby="dropdownSubMenuLink">
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><a class="dropdown-item" href="#">Something else here</a></li>
</ul>
</li>
</ul>
</div>
dropend
类添加到第一个li
元素中。请查看https://jsfiddle.net/tmedxnLq/。 - chris FrisinaShprink的代码对我有很大帮助,但为了避免下拉框溢出屏幕,我进行了更新:
JS:
$('ul.dropdown-menu [data-toggle=dropdown]').on('click', function(event) {
// Avoid following the href location when clicking
event.preventDefault();
// Avoid having the menu to close when clicking
event.stopPropagation();
// If a menu is already open we close it
$('ul.dropdown-menu [data-toggle=dropdown]').parent().removeClass('open');
// opening the one you clicked on
$(this).parent().addClass('open');
var menu = $(this).parent().find("ul");
var menupos = $(menu).offset();
if (menupos.left + menu.width() > $(window).width()) {
var newpos = -$(menu).width();
menu.css({ left: newpos });
} else {
var newpos = $(this).parent().width();
menu.css({ left: newpos });
}
});
.nav .open > a,
.nav .open > a:hover,
.nav .open > a:focus {
background-color: #c5c5c5;
border-color: #428bca;
}
针对Skelly的非常有用的解决方法,我想留言:在Bootstrap-sass 3.3.6版本中的utilities.scss文件的第19行:.pull-left
使用了float:left !important
。因此,我建议在他的CSS中也使用!important:
.dropdown-submenu.pull-left {
float:none !important;
}
<div class="btn-group dropend" role="group">
<button id="submenu" type="button" class="dropdown-item dropdown-toggle submenu" data-bs-toggle="dropdown" aria-expanded="false">
Menu Item
</button>
<div class="dropdown-menu" aria-labelledby="submenu">
<a class="dropdown-item">Submenu</a>
</div>
</div>
JS
$('.submenu').click(function(e){
e.preventDefault();
e.stopPropagation();
});
HTML
<!DOCTYPE html>
<html>
<head>
<title>Dropdown Navbar</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">The Providers</a>
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav">
<li ><a href="#">Home</a></li>
<li id="course" class="dropdown" ><a href="#">Courses<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">SEO</a></li>
<li><a href="#">A.I</a></li>
<li><a href="#">M.L</a></li>
<li><a href="#">Graphics</a></li>
<li id="sub-dropdown" class="dropdown"><a href="#">web Design<span style="margin-left: 43px;" class="glyphicon glyphicon-chevron-right"></span> </a>
<ul id="sub-dropdown-menu" class="dropdown-menu">
<li><a href="#">HTML</a></li>
<li><a href="#">CSS</a></li>
<li><a href="#">Bootstrap 3</a></li>
<li><a href="#">JavaScript</a></li>
<li><a href="#">Angular</a></li>
</ul>
</li>
</li>
</ul>
</li>
<li><a href="#">Gallery</a></li>
<li><a href="#">Contact us</a></li>
<li><a href="#">Policy</a></li>
</ul>
</div>
</div>
</nav>
</body>
</html>
CSS
body{
font-family: monospace;
outline: none;
background-image: url(image.jpg);
background-size: cover;
background-repeat: no-repeat;
height: 100vh;
}
.navbar-inverse{
background-color: #2a84eb ;
border-color: transparent;
}
.navbar-inverse .navbar-brand{
color: #fff;
font-size: 30px;
margin-right: 40px;
}
#myNavbar .navbar-nav li a{
color: #fff;
font-size: 19px;
}
#myNavbar #course{
transition: all 0.3s ease-in-out;
}
#myNavbar #course:hover{
background-color:#0751a6;
}
.dropdown-menu{
display: none;
position: absolute;
background-color: #f0f0f0;
box-shadow: 2px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
#sub-dropdown-menu{
display: none;
position: absolute;
background-color: #f0f0f0;
margin-left: 186px;
margin-top: -26px;
}
#sub-dropdown-menu a , .dropdown-menu a {
color: #000 !important;
font-size: 16px !important;
}
.dropdown:hover .dropdown-menu {display: block;transition: all 0.5s ease-in-out;}
.dropdown .dropdown-menu a:hover{background-color: #c9c7c7;}
#sub-dropdown:hover #sub-dropdown-menu {display: block;}
2022年的Bootstrap 5中,这个GitHub仓库中的JS代码是子菜单的终极解决方案:https://github.com/dallaslu/bootstrap-5-multi-level-dropdown。