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
还添加了margin-top:0来重置.dropdown-menu的引导css边距,这样当用户缓慢地从下拉菜单悬停到菜单列表时,菜单列表不会消失。
ul.nav li.dropdown:hover > ul.dropdown-menu {
display: block;
}
.nav .dropdown-menu {
margin-top: 0;
}
其他回答
你有这样的代码:
<a class="dropdown-toggle" data-toggle="dropdown">Show menu</a>
<ul class="dropdown-menu" role="menu">
<li>Link 1</li>
<li>Link 2</li>
<li>Link 3</li>
</ul>
通常它在单击事件上工作,而您希望它在悬停事件上工作。这是非常简单的,只需使用JavaScript/jQuery代码:
$(document).ready(function () {
$('.dropdown-toggle').mouseover(function() {
$('.dropdown-menu').show();
})
$('.dropdown-toggle').mouseout(function() {
t = setTimeout(function() {
$('.dropdown-menu').hide();
}, 100);
$('.dropdown-menu').on('mouseenter', function() {
$('.dropdown-menu').show();
clearTimeout(t);
}).on('mouseleave', function() {
$('.dropdown-menu').hide();
})
})
})
这工作得很好,这里是解释:我们有一个按钮,和一个菜单。当我们悬停按钮时,我们会显示菜单,当我们将鼠标移出按钮时,我们会在100毫秒后隐藏菜单。如果你想知道我为什么使用它,是因为你需要时间从菜单上的按钮拖动光标。当你在菜单上时,时间会被重置,你可以在那里停留多长时间都行。当您退出菜单时,我们将立即隐藏菜单,没有任何超时。
我已经在许多项目中使用了这段代码,如果您在使用它时遇到任何问题,请随时向我提问。
我是这样做的:
$('ul.nav li.dropdown').hover(function(){
$(this).children('ul.dropdown-menu').slideDown();
}, function(){
$(this).children('ul.dropdown-menu').slideUp();
});
我希望这能帮助到一些人……
引导版本4和5解决方案。(兼容)
这些都是使用mouseover和mouseleave事件和一些屏幕宽度检查的完整解决方案。这比纯CSS解决方案更好。
Bootstrap v5 -纯JS(用于webpack)
export class BootstrapOpenMenuHover {
/**
* Constructor.
*/
constructor() {
this.windowWidth = window.innerWidth;
this.mobileBreakPoint = 991; // Put your menu break point here, when it switches to a hamburger icon.
this.dropdownNavItems = document.querySelectorAll(".dropdown-toggle.nav-link");
this.dropdownMenuItems = document.querySelectorAll(".dropdown-menu");
this.setEventListeners();
}
/**
* Set all of our event listeners.
*/
setEventListeners() {
const _self = this;
// To be safe set the width once the dom is loaded.
window.addEventListener('load', function () {
_self.windowWidth = window.innerWidth;
});
// Keep track of the width in the event of a resize.
window.addEventListener('resize', function () {
_self.windowWidth = window.innerWidth;
});
// Bind our hover events.
if (_self.dropdownNavItems !== null) {
for (let i = 0; i < _self.dropdownNavItems.length; i++) {
// On mouse enter.
_self.dropdownNavItems[i].addEventListener('mouseenter', function () {
if (_self.windowWidth >= _self.mobileBreakPoint) {
this.classList.add('show');
this.ariaExpanded = true;
this.dataset.bsToggle = null;
// Update the .dropdown-menu
this.nextElementSibling.classList.add('show');
this.nextElementSibling.dataset.bsPopper = 'none';
}
});
// On mouse leave.
_self.dropdownNavItems[i].addEventListener('mouseleave', function () {
if (_self.windowWidth >= _self.mobileBreakPoint) {
this.classList.remove('show');
this.ariaExpanded = false;
this.dataset.bsToggle = 'dropdown';
// Update the .dropdown-menu
this.nextElementSibling.classList.remove('show');
this.nextElementSibling.dataset.bsPopper = null;
}
});
}
}
// Bind events to .dropdown-menu items.
if (_self.dropdownMenuItems !== null) {
for (let i = 0; i < _self.dropdownMenuItems.length; i++) {
// On mouse enter.
_self.dropdownMenuItems[i].addEventListener('mouseenter', function () {
if (_self.windowWidth >= _self.mobileBreakPoint) {
this.classList.add('show');
this.dataset.bsPopper = 'none';
// Update the .dropdown-toggle
this.previousElementSibling.classList.add('show');
this.previousElementSibling.ariaExpanded = true;
this.previousElementSibling.dataset.bsToggle = null;
}
});
// On mouse leave.
_self.dropdownMenuItems[i].addEventListener('mouseleave', function () {
if (_self.windowWidth >= _self.mobileBreakPoint) {
this.classList.remove('show');
this.dataset.bsPopper = null;
// Update the .dropdown-toggle
this.previousElementSibling.classList.remove('show');
this.previousElementSibling.ariaExpanded = false;
this.previousElementSibling.dataset.bsToggle = 'dropdown';
}
});
}
}
}
}
const bootstrapOpenMenuHover = new BootstrapOpenMenuHover();
Bootstrap v4方案
这将允许您遵循顶级导航链接。
这是基于桌面和移动平台设计的。随意更改BREAK_POINT变量以满足您的需要:D。
jQuery
var WINDOW_WIDTH;
var BREAK_POINT = 991;
(function ($) {
/** Set window width onload */
WINDOW_WIDTH = $(window).width(); // Returns width of browser viewport
/** Set window width if the browser is resized */
$(window).resize(function () {
WINDOW_WIDTH = $(window).width(); // Returns width of browser viewport
});
/** Dropdown menu on mouseenter */
$(".nav-item.dropdown").on('mouseenter', function () {
console.log("mouseenter");
if (WINDOW_WIDTH >= BREAK_POINT) {
// Open up the dropdown
$(this).addClass('show'); // add the class show to the li parent
$(this).children('.nav-link').removeAttr('data-toggle'); // remove the data-toggle attribute so we can click and follow link
$(this).children('.dropdown-menu').addClass('show'); // add the class show to the dropdown div sibling
}
});
/** Dropdown menu on mouseleave */
$(".nav-item.dropdown").on('mouseleave', function () {
console.log("mouseleave");
if (WINDOW_WIDTH >= BREAK_POINT) {
// Close the dropdown
$(this).removeClass('show'); // add the class show to the li parent
$(this).children('.nav-link').attr('data-toggle', 'dropdown'); // remove the data-toggle attribute so we can click and follow link
$(this).children('.dropdown-menu').removeClass('show'); // add the class show to the dropdown div sibling
}
});
});
CSS
@media(min-width: 768px) {
.dropdown-menu {
margin-top: 0; // fixes closing on slow mouse transition
}
}
只需三行代码自定义您的CSS样式
.dropdown:hover .dropdown-menu {
display: block;
}
最标准的回答:
支持aria-expanded属性 支持非触摸设备 支持触摸设备 支持所有下拉菜单
var isTouchDevice = (('ontouchstart' in window) ||
(navigator.MaxTouchPoints > 0) ||
(navigator.msMaxTouchPoints > 0));
if(!isTouchDevice){
// open dropdowns on hover on non mobile devices
$(".dropdown").hover(function(e) {
$('.dropdown-toggle', this).dropdown("toggle");
e.stopPropagation();
});
// prevent blinkling
$(".submenu-link").click(function(e) {
e.stopPropagation();
});
}
如果你需要,你可以将$(".dropdown")更改为特定的区域:
$("#top-menu .dropdown")