Bootstrap 下拉菜单在悬停时关闭

Question

我有一个下拉菜单，里面有另一个下拉菜单，我添加了一些 Jquery 代码来打开/关闭悬停时的两个下拉菜单。

我将鼠标悬停在主下拉菜单 services 上，然后悬停在 service2 这是另一个下拉菜单上，当我尝试转到其中的元素 Service2 sub1、Service2 sub2 时，下拉菜单已关闭。

代码如下：

HTML：

<div class="navbar navbar-default navbar-static-top">
    <div class="container">
        <ul class="nav navbar-nav">
            <li class="dropdown">
                <a href="#" data-toggle="dropdown" class="dropdown-toggle">Services <b class="caret"></b></a>
                <ul class="dropdown-menu">
                    <li><a href="#">Service1</a></li>
                    <li role="presentation">
                    <a data-toggle="collapse" href="#collapse" class="sub-menu">
                        Service2 <b class="caret"></b>
                    </a></li>
                    <ul>
                    <div id="collapse" class="panel-collapse collapse">
                        <li role="presentation"><a href="#">Service2 sub1</a></li>
                        <li role="presentation"><a href="#">Service2 sub2</a></li>
                    </div>
                    </ul>
                </ul>
            </li> <!-- .dropdown -->
        </ul> <!-- .navbar-nav -->
    </div> <!-- .container -->
</div> <!-- .navbar -->    

jQuery:

$(document).ready(function() {

    //Stop propagation for the dropdown
    $(document).on('click', '.dropdown-menu', function (e) {
        e.stopPropagation();
    });

    //On hovering over the main menu 'Services'
    $(".dropdown").hover(
        function() {
        $('.dropdown-menu', this).stop().fadeIn("fast");
        $(this).addClass('active');
        },
        function() {
        $('.dropdown-menu', this).stop().fadeOut("fast");
        $(this).removeClass('active');
        }
    );

    //On hovering over the sub-menu `Services`
    $(".sub-menu").hover(
        function() {
        $('#collapse').removeClass('collapse').addClass('collapse in');
        },
        function() {
        $('#collapse').removeClass('collapse in').addClass('collapse');
        }
    );

});

她是一个活生生的小提琴来测试https://jsfiddle.net/0ksz9tnL/

Answer 1

首先我想指出您的 HTML 无效，您在 ul 内有一个 ul

看这里：

<ul class="dropdown-menu">
    <li><a href="#">Service1</a></li>
    <li role="presentation">
    <a data-toggle="collapse" href="#collapse" class="sub-menu">
        Service2 <b class="caret"></b>
    </a></li>
    <ul>

其次，如果您只是将 sub-menu 类从 <a data-toggle="collapse" href="#collapse" class="sub-menu"> 移动到它的父级，那么它就可以正常工作。

工作演示

$(document).ready(function() {

  //Stop propagation for the dropdown
  $(document).on('click', '.dropdown-menu', function(e) {
    e.stopPropagation();
  });

  //On hovering over the main menu 'Services'
  $(".dropdown").hover(
    function() {
      $('.dropdown-menu', this).stop().fadeIn("fast");
      $(this).addClass('active');
    },
    function() {
      $('.dropdown-menu', this).stop().fadeOut("fast");
      $(this).removeClass('active');
    }
  );

  //On hovering over the sub-menu `Services`
  $(".sub-menu").hover(
    function() {
      $('#collapse').removeClass('collapse').addClass('collapse in');
    },
    function() {
      $('#collapse').removeClass('collapse in').addClass('collapse');
    }
  );

});

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<div class="navbar navbar-default navbar-static-top">
  <div class="container">
    <ul class="nav navbar-nav">
      <li class="dropdown">
        <a href="#" data-toggle="dropdown" class="dropdown-toggle">Services <b class="caret"></b></a>
        <ul class="dropdown-menu">
          <li><a href="#">Service1</a></li>
          <li role="presentation" class="sub-menu">
            <a data-toggle="collapse" href="#collapse">
              Service2 <b class="caret"></b>
            </a>
            <ul>
              <div id="collapse" class="panel-collapse collapse">
                <li role="presentation"><a href="#">Service2 sub1</a></li>
                <li role="presentation"><a href="#">Service2 sub2</a></li>
              </div>
            </ul>
          </li>
        </ul>
      </li> <!-- .dropdown -->
    </ul> <!-- .navbar-nav -->
  </div> <!-- .container -->
</div> <!-- .navbar -->

<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>