如何在Bootstrap 4.1中的悬停上创建一个下拉子菜单? [英] How to create a dropdown submenu on hover in Bootstrap 4.1?
本文介绍了如何在Bootstrap 4.1中的悬停上创建一个下拉子菜单?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在一个网站上，要在其中悬停时在 Bootstrap 4.1
I am working on a website in which I want to create a dropdown submenu on hover in Bootstrap 4.1
我用来在悬停时创建下拉菜单的HTML代码是:
The HTML code which I have used in order to create a dropdown menu on hover are:
<div class="navbar-collapse text-center" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
main menu
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#">A</a>
<a class="dropdown-item" href="#">B</a>
<a class="dropdown-item" href="#">C</a>
<a class="dropdown-item" href="#">D</a>
</div>
</li>
<button type="submit" onclick="location.href='/M';" class="btn btn-default">R</button>
</ul>
</div>
问题陈述:
Problem Statement:
我想知道我应该在上面的代码中进行哪些更改，以使D悬停在D上；显示了下拉菜单项E，F，G，H .
I am wondering what changes I should make in the code above so that on hover of D; dropdown items E, F, G, H, are shown.
推荐答案
这可能对您有帮助.....
This might help you.....
.dropdown:hover>.dropdown-menu {
display: block;
}
.dropdown-item:hover>.dropdown-menu {
display: block;
}
ul li{
list-style-type:none;
display: inline;
}
.navbar-nav .nav-link{display:inline-block;}
.ml-auto {display:inline-block!important;}
.dropdown>.dropdown-toggle:active {
pointer-events: none;
}
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css" integrity="sha384-Smlep5jCw/wG7hdkwQ/Z5nLIefveQRIY9nfy6xoR1uRYBtpZgI6339F5dgvm/e9B" crossorigin="anonymous">
<title>Dropdown submenu on hover</title>
</head>
<body>
<div class="navbar-collapse text-center" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Main menu
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#">A</a>
<a class="dropdown-item" href="#">B</a>
<a class="dropdown-item" href="#">C</a>
<a class="dropdown-item nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
D
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#">E</a>
<a class="dropdown-item" href="#">F</a>
<a class="dropdown-item" href="#">G</a>
<a class="dropdown-item" href="#">H</a>
</div>
</div>
</li>
</ul>
</div>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/js/bootstrap.min.js" integrity="sha384-o+RDsa0aLu++PJvFqy8fFScvbHFLtbvScb8AjopnFD+iEQ7wo/CG0xlczd+2O/em" crossorigin="anonymous"></script>
</body>
</html>
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