.dropdown.dropdown-lg .dropdown-menu {
margin-top: -1px;
padding: 6px 20px;
}
.input-group-btn .btn-group {
display: flex !important;
}
.btn-group .btn {
border-radius: 0;
margin-left: -1px;
}
.btn-group .btn:last-child {
border-top-right-radius: 4px;
border-bottom-right-radius: 4px;
}
.btn-group .form-horizontal .btn[type="submit"] {
border-top-left-radius: 4px;
border-bottom-left-radius: 4px;
}
.form-horizontal .form-group {
margin-left: 0;
margin-right: 0;
}
.form-group .form-control:last-child {
border-top-left-radius: 4px;
border-bottom-left-radius: 4px;
}
@media screen and (min-width: 768px) {
#adv-search {
width: 100px;
}
.dropdown.dropdown-lg {
position: static !important;
}
.dropdown.dropdown-lg .dropdown-menu {
min-width: 500px;
}
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/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"/>
<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">
<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-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
<li class="divider"></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<div class="navbar-form navbar-right input-group" id="adv-search">
<input type="text" class="form-control" placeholder="Search for ..." />
<div class="input-group-btn">
<div class="btn-group" role="group">
<div class="dropdown dropdown-lg">
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"><span class="caret"></span></button>
<div class="dropdown-menu dropdown-menu-right" role="menu">
<form class="form-horizontal" role="form">
<div class="form-group">
<label for="filter" class="col-sm-2 control-label">Filter by</label>
<div class="col-sm-10">
<select class="form-control">
<option value="0" selected>All Snippets</option>
<option value="1">Featured</option>
<option value="2">Most popular</option>
<option value="3">Top rated</option>
<option value="4">Most commented</option>
</select>
</div>
</div>
<div class="form-group">
<label for="contain" class="col-sm-2 control-label">Author</label>
<div class="col-sm-10">
<input class="form-control" type="text" />
</div>
</div>
<div class="form-group">
<label for="contain">Contains the words</label>
<div class="col-sm-10">
<input class="form-control" type="text" />
</div>
</div>
<button type="submit" class="btn btn-primary"><span class="glyphicon glyphicon-search" aria-hidden="true"></span></button>
</form>
</div>
</div>
<button type="button" class="btn btn-primary"><span class="glyphicon glyphicon-search" aria-hidden="true"></span></button>
</div>
</div>
</div>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>获得了高级评价
答案 0 :(得分：0)
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<style type="text/css">
.dropdown.dropdown-lg .dropdown-menu {
margin-top: -1px;
padding: 6px 20px;
}
.input-group-btn .btn-group {
display: flex !important;
}
.btn-group .btn {
border-radius: 0;
margin-left: -1px;
}
.btn-group .btn:last-child {
border-top-right-radius: 4px;
border-bottom-right-radius: 4px;
}
.btn-group .form-horizontal .btn[type="submit"] {
border-top-left-radius: 4px;
border-bottom-left-radius: 4px;
}
.form-horizontal .form-group {
margin-left: 0;
margin-right: 0;
}
.form-group .form-control:last-child {
border-top-left-radius: 4px;
border-bottom-left-radius: 4px;
}
@media screen and (min-width: 768px) {
#adv-search {
width: 100px;
}
.dropdown.dropdown-lg {
position: static !important;
}
.dropdown.dropdown-lg .dropdown-menu {
min-width: 500px;
}
}
</style>
</head>
<body>
<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">
<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-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
<li class="divider"></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<div class="navbar-form navbar-right input-group" id="adv-search">
<input type="text" class="form-control" placeholder="Search for ..." />
<div class="input-group-btn">
<div class="btn-group" role="group">
<div class="dropdown dropdown-lg">
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"><span class="caret"></span></button>
<div class="dropdown-menu dropdown-menu-right" role="menu">
<form class="form-horizontal" role="form">
<div class="form-group">
<label for="filter" class="col-sm-2 control-label">Filter by</label>
<div class="col-sm-10">
<select class="form-control">
<option value="0" selected>All Snippets</option>
<option value="1">Featured</option>
<option value="2">Most popular</option>
<option value="3">Top rated</option>
<option value="4">Most commented</option>
</select>
</div>
</div>
<div class="form-group">
<label for="contain" class="col-sm-2 control-label">Author</label>
<div class="col-sm-10">
<input class="form-control" type="text" />
</div>
</div>
<div class="form-group">
<label for="contain" class="col-sm-2 control-label" >Contains the words</label>
<div class="col-sm-10">
<input class="form-control" type="text" />
</div>
</div>
<button type="submit" class="btn btn-primary"><span class="glyphicon glyphicon-search" aria-hidden="true"></span></button>
</form>
</div>
</div>
<button type="button" class="btn btn-primary"><span class="glyphicon glyphicon-search" aria-hidden="true"></span></button>
</div>
</div>
</div>
</body>
</html>
您尚未为该特定标签添加class="col-sm-2 control-label"。
现在它是垂直对齐的。