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我有一个非常长的移动菜单,有4个菜单项,每个项目都有下拉菜单,第一个下拉菜单很长,当我在第一个下拉列表中滚动浏览导航时,我无法进入最后一个下拉列表在我的菜单中,除非我关闭第一个下拉列表,但我希望能够进入最后一个下拉列表,即使第一个下拉列表打开.

这是HTML

.navbar-collapse {
  height: 100vh;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />

<div class="navbar navbar-inverse navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="/"><img src="~/Images/logo.png" class="img-responsive" /></a>
    </div>
    <div class="navbar-collapse collapse">
      <ul class="nav navbar-nav">
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Option</a>
          <div class="dropdown-menu dropdown-communities" role="menu">
            <div class="row current-communities">
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
            </div>
            <hr class="current-communities-hr" />
            <div class="row upcoming-communities">
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
            </div>
          </div>
        </li>
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Option</a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
          </ul>
        </li>
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Option</a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
          </ul>
        </li>
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Option</a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
          </ul>
        </li>
      </ul>
    </div>
  </div>
</div>

我尝试过以下方法:

.navbar-collapse {
    height: 100vh;
}

但是当第一个打开时,我仍然无法进入最后一个下拉菜单.

解决方法

Bootstrap将绝对定位放在他们的.dropdown-menu类上.只需相对定位它就应该是金色的.请参阅代码段中的修改.
.dropdown-menu{
  position:relative;
  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />

<style>
  .navbar-collapse {
    height: calc(100vh - 50pX);
  }
</style>


<div class="navbar navbar-inverse navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="/"><img src="~/Images/logo.png" class="img-responsive" /></a>
    </div>
    <div class="navbar-collapse collapse">
      <ul class="nav navbar-nav">
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Option 1</a>
          <div class="dropdown-menu dropdown-communities" role="menu">
            <div class="row current-communities">
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
            </div>
            <hr class="current-communities-hr" />
            <div class="row upcoming-communities">
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
            </div>
          </div>
        </li>
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Option 2</a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
          </ul>
        </li>
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Option 3</a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
          </ul>
        </li>
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Option 4</a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
            <li><a href="/Link/">Link</a></li>
          </ul>
        </li>
      </ul>
    </div>
  </div>
</div>

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