删除Bootstrap 3下拉菜单和下拉菜单之间的边框

时间：2018-05-16 17:57:41

标签： css css3 twitter-bootstrap-3

如何设置CSS设置以显示引导程序.dropdown和.dropdown-menu看起来像合并（没有边框），如下图所示的第二个菜单？

enter image description here

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.navbar-default .navbar-nav>li>a {
  border-bottom: 0px solid #ccc;
}

.navbar-default {}

.dropdown {
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
}

.dropdown:hover {
  background: white;
  border-left: 1px solid #ccc;
  border-right: 1px solid #ccc;
  border-bottom: 0px solid #fff;
}

.dropdown .dropdown-menu {
  border-top: 1px solid #ccc;
  z-index: 1;
}

.dropdown .dropdown-menu {
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  max-height: 0;
  display: block;
  overflow: hidden;
  opacity: 0;
  box-shadow: none;
  border-radius: 0px;
}

.dropdown:hover .dropdown-menu {
  max-height: 400px;
  opacity: 1;
}
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
<div class="container">
	<div class="row">
		<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="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
        <li><a href="#">Link</a></li>
        <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>
                <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>
     
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#">Link</a></li>
        <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>
          </ul>
        </li>
      </ul>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>
	</div>
</div>
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4 个答案:

答案 0 :(得分：2)

您可以使用DISEASE Gender Age Race Date Freq Campy F 32 ASIAN 1/6/2014 10 Campy M 52 WHITE 1/2/2014 15 Campy M 63 WHITE 1/3/2014 56 Chlamydia F 24 LATINO 1/8/2014 32 Chlamydia F 32 AA 1/3/2014 52 元素的底部边框以及一些z-index和负边距来使其覆盖菜单上的边框。默认选择器很重，但它可以工作。

您还需要将左侧菜单下拉菜单向左移动以隐藏间隙，右侧下拉菜单向右移动。您可以分别使用a和translateX(-1px)来完成此操作。我建议使用转换，因为如果使用边距，似乎会出现动画延迟。

translateX(1px)
.navbar-default .navbar-nav>li>a {
  border-bottom: 0px solid #ccc;
}

.navbar-default {}

.dropdown {
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
}

.dropdown:hover {
  background: white;
  border-left: 1px solid #ccc;
  border-right: 1px solid #ccc;
  border-bottom: 0px solid #fff;
}

.dropdown .dropdown-menu {
  border-top: 1px solid #ccc;
  z-index: 1;
}

.dropdown .dropdown-menu {
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  max-height: 0;
  display: block;
  overflow: hidden;
  opacity: 0;
  box-shadow: none;
  border-radius: 0px;
}

.dropdown:hover .dropdown-menu {
  max-height: 400px;
  opacity: 1;
}

/* NEW CSS */

.navbar-default .navbar-nav>li:hover>a {
    border-bottom: 1px solid #fff;
    margin-bottom: -1px;
    z-index: 10;
} 

.dropdown-menu {
  transform: translateX(-1px);
}

.navbar-right .dropdown-menu {
  transform: translateX(1px);
}

答案 1 :(得分：0)

.dropdown .dropdown-menu {
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  max-height: 0;
  display: block;
  overflow: hidden;
  opacity: 0;
  box-shadow: none;
  border-radius: 0px;
  border-top: none;
  margin-left: -1px;
}

（注意最后两个额外的属性）

答案 2 :(得分：0)

您可以使颜色透明，这样您就不必担心更改间距

    .dropdown .dropdown-menu {
    border-top: 1px solid transparent;
}

答案 3 :(得分：0)

我的方法包括使用function wrap_videos_with_ads( $html, $url, $attr, $post_id ) { $ad_above_video = 'PUT YOUR AD CODE HERE'; $ad_below_video = 'PUT YOUR AD CODE HERE'; return $ad_above_video.$html.$ad_below_video; } add_filter( 'embed_oembed_html', 'wrap_videos_with_ads', 11, 4 ); 为.dropdown添加一个伪元素，并将其放在带有border: 1px solid white;的.dropdown之上

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z-index: 2;
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.navbar-default .navbar-nav>li>a {
  border-bottom: 0px solid #ccc;
}

.navbar-default {}

.dropdown {
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
}

.dropdown:hover::after {
  content: '';                    /* added */
  width: 100%;                    /* added */
  position: absolute;             /* added */
  border-bottom: 1px solid white; /* added */
  z-index: 2;                     /* added */
}

.dropdown:hover {
  background: white;
  border-left: 1px solid #ccc;
  border-right: 1px solid #ccc;
  border-bottom: 0px solid #fff;
}

.dropdown .dropdown-menu {
  border-top: 1px solid #ccc;
  z-index: 1;
}

.dropdown .dropdown-menu {
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  max-height: 0;
  display: block;
  overflow: hidden;
  opacity: 0;
  box-shadow: none;
  border-radius: 0px;
  margin-left: -1px;
}

.dropdown:hover .dropdown-menu {
  max-height: 400px;
  opacity: 1;
}
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