Bootstrap 4.1中悬停时的下拉菜单 [英] Dropdown on hover in Bootstrap 4.1

问题描述

我有一个网站，其中使用 Bootstrap 4.1 .目前，该下拉列表正处于点击状态.

I have a website in which I have created dropdown using Bootstrap 4.1. At this moment, the dropdown is working on click.

我用来创建下拉菜单的HTML代码是:

The HTML code which I have used in order to create the dropdown are:

<div class="collapse 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:

我想知道我应该在上面的代码中进行哪些更改，以便可以在悬停时看到下拉项目(A，B，C，D).

I am wondering what changes I should make in the code above so that I can see the dropdown items (A,B,C,D) on hover.

推荐答案

您在寻找这个吗?

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

<link href="https://getbootstrap.com/docs/4.1/dist/css/bootstrap.min.css" rel="stylesheet" />
<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>

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