Bootstrap 4 下拉菜单不工作

Question

不确定是不是只有我一个人，我正在从 bootstrap 3 转移到 v4 并且下拉列表不起作用，即使是从 bootstrap v4 下拉会话中复制的最简单的示例也是如此。下面的代码显示了一个可单击但不会下拉的按钮。我发现在我刷新并单击按钮后的 0.01 秒时，出现了下拉菜单。但是之后的任何时候都无法正常工作。这是我的代码

js

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js" integrity="sha384-3ceskX3iaEnIogmQchP8opvBy3Mi7Ce34nWjpBIwVTHfGYWQS9jwHDVRnpKKHJg7" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.3.7/js/tether.min.js" integrity="sha384-XTs3FgkjiBgo8qjEjBk0tGmf3wPrWtA6coPfQDfFEY8AnYJwjalXCiosYRBIBZX8" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/js/bootstrap.min.js" integrity="sha384-BLiI7JTZm+JWlgKa0M0kGRpJbF2J8q+qreVrKBC47e3K6BW78kGLrCkeRX6I9RoK" crossorigin="anonymous"></script>

css

<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/css/tether-theme-arrows-dark.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css" integrity="sha384-AysaV+vQoT3kOAXZkl02PThvDr8HYKPZhNT5h/CXfBThSRXQ6jW5DO2ekP5ViFdi" crossorigin="anonymous">

HTML

<div class="btn-group">
  <button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Action
  </button>
  <div class="dropdown-menu">
    <a class="dropdown-item" href="#">Action</a>
    <a class="dropdown-item" href="#">Another action</a>
    <a class="dropdown-item" href="#">Something else here</a>
    <div class="dropdown-divider"></div>
    <a class="dropdown-item" href="#">Separated link</a>
  </div>
</div>

Answer 1

Alpha 4.0.6 遇到了同样的问题。

我已经将 bootstrap.css 3.3.7 中的 .dropdown 样式复制到 dropdowns.less 中并且有效。

.dropup,
.dropdown {
  position: relative;
}

.dropdown-toggle::after {
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 0.3em;
  vertical-align: middle;
  content: "";
  border-top: 0.3em solid;
  border-right: 0.3em solid transparent;
  border-left: 0.3em solid transparent;
}

.dropdown-toggle:focus {
  outline: 0;
}

.dropup .dropdown-toggle::after {
  border-top: 0;
  border-bottom: 0.3em solid;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1000;
  display: none;
  float: left;
  min-width: 10rem;
  padding: 0.5rem 0;
  margin: 0.125rem 0 0;
  font-size: 1rem;
  color: #292b2c;
  text-align: left;
  list-style: none;
  background-color: #fff;
  -webkit-background-clip: padding-box;
          background-clip: padding-box;
  border: 1px solid rgba(0, 0, 0, 0.15);
  border-radius: 0.25rem;
}

.dropdown-divider {
  height: 1px;
  margin: 0.5rem 0;
  overflow: hidden;
  background-color: #eceeef;
}

.dropdown-item {
  display: block;
  width: 100%;
  padding: 3px 1.5rem;
  clear: both;
  font-weight: normal;
  color: #292b2c;
  text-align: inherit;
  white-space: nowrap;
  background: none;
  border: 0;
}

.dropdown-item:focus, .dropdown-item:hover {
  color: #1d1e1f;
  text-decoration: none;
  background-color: #f7f7f9;
}

.dropdown-item.active, .dropdown-item:active {
  color: #fff;
  text-decoration: none;
  background-color: #0275d8;
}

.dropdown-item.disabled, .dropdown-item:disabled {
  color: #636c72;
  cursor: not-allowed;
  background-color: transparent;
}

.show > .dropdown-menu {
  display: block;
}

.show > a {
  outline: 0;
}

.dropdown-menu-right {
  right: 0;
  left: auto;
}

.dropdown-menu-left {
  right: auto;
  left: 0;
}

.dropdown-header {
  display: block;
  padding: 0.5rem 1.5rem;
  margin-bottom: 0;
  font-size: 0.875rem;
  color: #636c72;
  white-space: nowrap;
}

.dropdown-backdrop {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 990;
}

.dropup .dropdown-menu {
  top: auto;
  bottom: 100%;
  margin-bottom: 0.125rem;
}

不是有效的工作，但它有效:-)

Answer 2

btn-group class 不再用于 Bootstrap 中的下拉菜单 4. 使用 dropdown class 作为父项：

<div class="dropdown">
  <button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Action
  </button>
  <div class="dropdown-menu">
    <a class="dropdown-item" href="#">Action</a>
    <a class="dropdown-item" href="#">Another action</a>
    <a class="dropdown-item" href="#">Something else here</a>
    <div class="dropdown-divider"></div>
    <a class="dropdown-item" href="#">Separated link</a>
  </div>
</div>

Answer 3

将此添加到您的 jQuery 代码中

$('.dropdown').click(function(){
  $('.dropdown-menu').toggleClass('show');
});

Bootstrap 4 下拉菜单不工作

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