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Bootstrap 4 Navbar下拉菜单不起作用

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我无法在bootstrap 4中获得正常运行的下拉菜单 . 我已经找到了解决方案，虽然有些人找到了解决方案，但他们并没有为我工作 .

我尝试使用bootstrap文档中的模板启用下拉功能，并使用jquery显示悬停时显示的下拉列表 . 都没有工作 . 我已经包含了所有必要的JS文件 . 在使用JS显示悬停菜单之前和之后，下拉菜单都不起作用 .

<nav class="navbar navbar-expand-lg  navbar-light bg-light">
  <a class="navbar-brand" href="#"><img src="assets/img/nav_logo.png" class="img-fluid"></a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>

  </div>
</nav>

JS for the dropdown onmouseover

$('body').on('mouseenter mouseleave','.dropdown',function(e){
  var _d=$(e.target).closest('.dropdown');
  if (e.type === 'mouseenter')_d.addClass('show');
  setTimeout(function(){
    _d.toggleClass('show', _d.is(':hover'));
    $('[data-toggle="dropdown"]', _d).attr('aria-expanded',_d.is(':hover'));
  },300);
});

可在此处找到当前站点：http://shatteredsite.com/testing/shatteredsite.html

感谢你给与我的帮助！

javascript jquery css bootstrap-4

2 回答

  • 1

    Bootstrap v4有recently changed dropdowns，导致previous method在悬停时打开下拉列表 - 您尝试过 - 不再有效 .

    这是v4.1.2及更高版本的最新解决方案：

    function toggleDropdown (e) {
  let _d = $(e.target).closest('.dropdown'),
      _m = $('.dropdown-menu', _d);
  setTimeout(function(){
    let shouldOpen = e.type !== 'click' && _d.is(':hover');
    _m.toggleClass('show', shouldOpen);
    _d.toggleClass('show', shouldOpen);
    $('[data-toggle="dropdown"]', _d).attr('aria-expanded', shouldOpen);
  }, e.type === 'mouseleave' ? 300 : 0);
}

$('body')
  .on('mouseenter mouseleave','.dropdown',toggleDropdown)
  .on('click', '.dropdown-menu a', toggleDropdown);

    看它工作：

    function toggleDropdown (e) {
  let _d = $(e.target).closest('.dropdown'),
      _m = $('.dropdown-menu', _d);
  setTimeout(function(){
    let shouldOpen = e.type !== 'click' && _d.is(':hover');
    _m.toggleClass('show', shouldOpen);
    _d.toggleClass('show', shouldOpen);
    $('[data-toggle="dropdown"]', _d).attr('aria-expanded', shouldOpen);
  }, e.type === 'mouseleave' ? 300 : 0);
}

$('body')
  .on('mouseenter mouseleave','.dropdown',toggleDropdown)
  .on('click', '.dropdown-menu a', toggleDropdown);

/* not needed, simply prevents reload on nav links clicks */
$('nav a').on('click tap', e => e.preventDefault())

    <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>

<nav class="navbar navbar-expand-lg  navbar-light bg-light">
  <a class="navbar-brand" href="#">Logo</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href>Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href>Link</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href>Action</a>
          <a class="dropdown-item" href>Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href>Something else here</a>
        </div>
      </li>
    </ul>
  </div>
</nav>
    回复于
  • 0

    从您的参考代码中删除它

    <link rel="stylesheet" href="assets/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

    改变这个

    <link rel="stylesheet" href="assets/css/bootstrap.min.css">

    这些脚本引用也是如此

    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>

<script src="assets/js/bootstrap.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

    改成

    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>

<script src="assets/js/bootstrap.js"></script>
    回复于

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