引导 3 导航栏活动 li 背景

Question

>我在这个小提琴中有一个引导导航栏，它的下拉菜单在悬停鼠标时可见

 $('.navbar .dropdown').hover(function () {
        $(this).find('.dropdown-menu').first().stop(true, true).slideDown(300);
    }, function () {
        $(this).find('.dropdown-menu').first().stop(true, true).slideUp(180)
    });

但是如何使父 li 背景仍然处于活动状态，就像将鼠标悬停向下移动到下拉菜单时类似而不滑动的下拉菜单。

Answer 1

您只需在

悬停时添加类open并在鼠标离开时将其删除即可。请参阅以下示例，

  $(document).ready(function() {
    $('.navbar .dropdown').hover(function() {
        $(this).addClass('open');
      },
      function() {
        $(this).removeClass('open');
      });
  });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://getbootstrap.com/dist/js/bootstrap.min.js"></script>
<link href="https://getbootstrap.com/dist/css/bootstrap.min.css" rel="stylesheet"/>
<nav class="navbar navbar-default">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <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="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></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 role="separator" class="divider"></li>
            <li><a href="#">Separated link</a></li>
            <li role="separator" class="divider"></li>
            <li><a href="#">One more separated link</a></li>
          </ul>
        </li>
      </ul>
    </div>
    <!-- /.navbar-collapse -->
  </div>
  <!-- /.container-fluid -->
</nav>