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2024-01-27 09:00:04

引导下拉子菜单缺失

引导3仍然在RC，但我只是试图实现它。我不知道怎么放一个子菜单类。甚至css中没有类，甚至新的文档也没有提到它

2分钟就到了。用类名作为下拉菜单

当前回答

引导5(2023年更新)

添加一些JavaScript来防止子菜单在父菜单下拉菜单打开时关闭。这可以通过切换显示:块…

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'
    })
})

引导5多级下拉单击 引导5多级下拉-悬停 Bootstrap 5多级下拉-悬停&动画过渡

或者，你可以使用这个CSS方法导航栏下拉菜单…

.dropdown-submenu {
  position: relative;
}

.dropdown-submenu .dropdown-menu {
  top: 0;
  left: 100%;
  margin-top: -1px;
}

.navbar-nav li:hover > ul.dropdown-menu {
    display: block;
}

引导5导航栏下拉悬停子菜单(仅CSS)

引导4(2018年更新)

在Bootstrap 3 RC中，下拉菜单被移除。用Bootstrap作者Mark Otto的话来说。

“现在子菜单在网络上并没有太大的位置，尤其是在移动网络上。它们将在3.0中被删除”- https://github.com/twbs/bootstrap/pull/6342

但是，用一点额外的CSS，你可以得到相同的功能。

悬停时导航栏子菜单:

.navbar-nav li:hover > ul.dropdown-menu {
    display: block;
}
.dropdown-submenu {
    position:relative;
}
.dropdown-submenu>.dropdown-menu {
    top:0;
    left:100%;
    margin-top:-6px;
}

导航栏子菜单下拉悬停 导航栏子菜单下拉悬停(右对齐) 导航栏子菜单下拉单击(右对齐) 导航栏下拉悬停(无子菜单)

引导3

下面是一个使用3.0 RC 1的例子:http://bootply.com/71520

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

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;
}

样品的标记

<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>

附注-在导航栏中调整左侧位置的例子:http://bootply.com/92442

2013-08-02 19:43:15

其他回答

直到今天(2014年1月9日)Bootstrap 3仍然不支持子菜单下拉。

我搜索了谷歌关于响应式导航菜单，发现这是最好的。

它是智能菜单http://www.smartmenus.org/

我希望这是谁想要导航菜单多级子菜单的出路。

智能菜单现在完全支持子菜单的Bootstrap元素样式。欲了解更多信息，请查看智能菜单网站。

2014-01-09 06:55:46

这是我的解决方案(我使用bootstrap 5):

HTML

<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();
});
2022-12-08 20:02:15

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;}

来源: https://www.youtube.com/watch?v=6CgnWhJ-amE

2021-10-15 12:09:43

Shprink的代码对我帮助最大，但为了避免下拉菜单离开屏幕，我将其更新为:

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 });
    }

});

CSS: FROM background-color: #eeeeee TO background-color: #c5c5c5 -白色字体和浅色背景看起来不太好。

.nav .open > a,
.nav .open > a:hover,
.nav .open > a:focus {
  background-color: #c5c5c5;
  border-color: #428bca;
}

我希望这能像帮助我一样帮助别人!

但是我希望Bootstrap能尽快把subs功能加回来。

2013-09-29 10:25:43

我给出了下拉的另一个解。希望这对你有帮助 只需添加这个js脚本

<script type="text/javascript"> jQuery("document").ready(function() {
  jQuery("ul.dropdown-menu > .dropdown.parent").click(function(e) {
    e.preventDefault();
    e.stopPropagation();
    if (jQuery(this).hasClass('open2'))
      jQuery(this).removeClass('open2');
    else {
      jQuery(this).addClass('open2');
    }

  });
}); < /script>

<style type="text/css">.open2{display:block; position:relative;}</style>
2014-01-14 11:36:59

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