我想有我的引导菜单自动下拉悬停，而不是必须点击菜单标题。我还想去掉菜单标题旁边的小箭头。
当前回答
在我看来，最好的办法是这样的:
;(function($, window, undefined) {
// Outside the scope of the jQuery plugin to
// keep track of all dropdowns
var $allDropdowns = $();
// If instantlyCloseOthers is true, then it will instantly
// shut other nav items when a new one is hovered over
$.fn.dropdownHover = function(options) {
// The element we really care about
// is the dropdown-toggle's parent
$allDropdowns = $allDropdowns.add(this.parent());
return this.each(function() {
var $this = $(this),
$parent = $this.parent(),
defaults = {
delay: 500,
instantlyCloseOthers: true
},
data = {
delay: $(this).data('delay'),
instantlyCloseOthers: $(this).data('close-others')
},
settings = $.extend(true, {}, defaults, options, data),
timeout;
$parent.hover(function(event) {
// So a neighbor can't open the dropdown
if(!$parent.hasClass('open') && !$this.is(event.target)) {
return true;
}
if(settings.instantlyCloseOthers === true)
$allDropdowns.removeClass('open');
window.clearTimeout(timeout);
$parent.addClass('open');
}, function() {
timeout = window.setTimeout(function() {
$parent.removeClass('open');
}, settings.delay);
});
// This helps with button groups!
$this.hover(function() {
if(settings.instantlyCloseOthers === true)
$allDropdowns.removeClass('open');
window.clearTimeout(timeout);
$parent.addClass('open');
});
// Handle submenus
$parent.find('.dropdown-submenu').each(function(){
var $this = $(this);
var subTimeout;
$this.hover(function() {
window.clearTimeout(subTimeout);
$this.children('.dropdown-menu').show();
// Always close submenu siblings instantly
$this.siblings().children('.dropdown-menu').hide();
}, function() {
var $submenu = $this.children('.dropdown-menu');
subTimeout = window.setTimeout(function() {
$submenu.hide();
}, settings.delay);
});
});
});
};
$(document).ready(function() {
// apply dropdownHover to all elements with the data-hover="dropdown" attribute
$('[data-hover="dropdown"]').dropdownHover();
});
})(jQuery, this);
样本的标记:
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" data-hover="dropdown" data-delay="1000" data-close-others="false">
Account <b class="caret"></b>
</a>
<ul class="dropdown-menu">
<li><a tabindex="-1" href="#">My Account</a></li>
<li class="divider"></li>
<li><a tabindex="-1" href="#">Change Email</a></li>
<li><a tabindex="-1" href="#">Change Password</a></li>
<li class="divider"></li>
<li><a tabindex="-1" href="#">Logout</a></li>
</ul>
</li>
其他回答
这里是JSFiddle -> https://jsfiddle.net/PRkonsult/mn31qf0p/1/
底部的JavaScript部分是真正起作用的部分。
HTML
<!--http://getbootstrap.com/components/#navbar-->
<div class="body-wrap">
<div class="container">
<nav class="navbar navbar-inverse" 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 <b class="caret"></b></a>
<ul class="dropdown-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>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Link</a></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="#">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>
</ul>
</li>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
<!-- /.container-fluid -->
</nav>
</div>
</div>
CSS
/* Bootstrap dropdown hover menu */
body {
font-family: 'PT Sans', sans-serif;
font-size: 13px;
font-weight: 400;
color: #4f5d6e;
position: relative;
background: rgb(26, 49, 95);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(26, 49, 95, 1)), color-stop(10%, rgba(26, 49, 95, 1)), color-stop(24%, rgba(29, 108, 141, 1)), color-stop(37%, rgba(41, 136, 151, 1)), color-stop(77%, rgba(39, 45, 100, 1)), color-stop(90%, rgba(26, 49, 95, 1)), color-stop(100%, rgba(26, 49, 95, 1)));
filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#1a315f', endColorstr='#1a315f', GradientType=0);
}
.body-wrap {
min-height: 700px;
}
.body-wrap {
position: relative;
z-index: 0;
}
.body-wrap: before,
.body-wrap: after {
content: '';
position: absolute;
top: 0;
left: 0;
right: 0;
z-index: -1;
height: 260px;
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(26, 49, 95, 1)), color-stop(100%, rgba(26, 49, 95, 0)));
background: linear-gradient(to bottom, rgba(26, 49, 95, 1) 0%, rgba(26, 49, 95, 0) 100%);
filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#1a315f', endColorstr='#001a315f', GradientType=0);
}
.body-wrap:after {
top: auto;
bottom: 0;
background: linear-gradient(to bottom, rgba(26, 49, 95, 0) 0%, rgba(26, 49, 95, 1) 100%);
filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#001a315f', endColorstr='#1a315f', GradientType=0);
}
nav {
margin-top: 60px;
box-shadow: 5px 4px 5px #000;
}
JavaScript代码的重要部分:
$('ul.nav li.dropdown').hover(function() {
$(this).find('.dropdown-menu').stop(true, true).delay(200).fadeIn(500);
}, function() {
$(this).find('.dropdown-menu').stop(true, true).delay(200).fadeOut(500);
});
用这个脚本覆盖bootstrap.js。
jQuery(document).ready(function ($) {
$('.navbar .dropdown').hover(function() {
$(this).addClass('extra-nav-class').find('.dropdown-menu').first().stop(true, true).delay(250).slideDown();
}, function() {
var na = $(this)
na.find('.dropdown-menu').first().stop(true, true).delay(100).slideUp('fast', function(){ na.removeClass('extra-nav-class') })
});
$('.dropdown-submenu').hover(function() {
$(this).addClass('extra-nav-class').find('.dropdown-menu').first().stop(true, true).delay(250).slideDown();
}, function() {
var na = $(this)
na.find('.dropdown-menu').first().stop(true, true).delay(100).slideUp('fast', function(){ na.removeClass('extra-nav-class') })
});
});
在我看来，最好的办法是这样的:
;(function($, window, undefined) {
// Outside the scope of the jQuery plugin to
// keep track of all dropdowns
var $allDropdowns = $();
// If instantlyCloseOthers is true, then it will instantly
// shut other nav items when a new one is hovered over
$.fn.dropdownHover = function(options) {
// The element we really care about
// is the dropdown-toggle's parent
$allDropdowns = $allDropdowns.add(this.parent());
return this.each(function() {
var $this = $(this),
$parent = $this.parent(),
defaults = {
delay: 500,
instantlyCloseOthers: true
},
data = {
delay: $(this).data('delay'),
instantlyCloseOthers: $(this).data('close-others')
},
settings = $.extend(true, {}, defaults, options, data),
timeout;
$parent.hover(function(event) {
// So a neighbor can't open the dropdown
if(!$parent.hasClass('open') && !$this.is(event.target)) {
return true;
}
if(settings.instantlyCloseOthers === true)
$allDropdowns.removeClass('open');
window.clearTimeout(timeout);
$parent.addClass('open');
}, function() {
timeout = window.setTimeout(function() {
$parent.removeClass('open');
}, settings.delay);
});
// This helps with button groups!
$this.hover(function() {
if(settings.instantlyCloseOthers === true)
$allDropdowns.removeClass('open');
window.clearTimeout(timeout);
$parent.addClass('open');
});
// Handle submenus
$parent.find('.dropdown-submenu').each(function(){
var $this = $(this);
var subTimeout;
$this.hover(function() {
window.clearTimeout(subTimeout);
$this.children('.dropdown-menu').show();
// Always close submenu siblings instantly
$this.siblings().children('.dropdown-menu').hide();
}, function() {
var $submenu = $this.children('.dropdown-menu');
subTimeout = window.setTimeout(function() {
$submenu.hide();
}, settings.delay);
});
});
});
};
$(document).ready(function() {
// apply dropdownHover to all elements with the data-hover="dropdown" attribute
$('[data-hover="dropdown"]').dropdownHover();
});
})(jQuery, this);
样本的标记:
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" data-hover="dropdown" data-delay="1000" data-close-others="false">
Account <b class="caret"></b>
</a>
<ul class="dropdown-menu">
<li><a tabindex="-1" href="#">My Account</a></li>
<li class="divider"></li>
<li><a tabindex="-1" href="#">Change Email</a></li>
<li><a tabindex="-1" href="#">Change Password</a></li>
<li class="divider"></li>
<li><a tabindex="-1" href="#">Logout</a></li>
</ul>
</li>
这将隐藏下拉列表和它们的插入符号，如果它们比平板电脑小。
@media (max-width: 768px) {
.navbar ul.dropdown-menu, .navbar li.dropdown b.caret {
display: none;
}
}
为了加强Sudharshan的回答，我将其包装在一个媒体查询中，以防止在XS显示宽度上出现悬停……
@media (min-width:768px)
{
ul.nav li.dropdown:hover > ul.dropdown-menu {
display: block;
}
.nav .dropdown-menu {
margin-top: 0;
}
}
标记中的插入符号也不是必需的，只是li的下拉类。
