<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css">
<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<script src="https://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<style>
#myInput { padding: 20px;
margin-top: -6px;
border: 0;
border-radius: 0;
background: #f1f1f1;
}
</style>
</head>
<body>
<div class="container">
<h2>Filterable Dropdown</h2>
<p>Open the dropdown menu and type something in the input field to search for dropdown items:</p>
<p>Note that we have styled the input field to fit the dropdown items.</p>
<div class="dropdown">
<button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown实例
<span class="caret"></span></button>
<ul class="dropdown-menu">
<input class="form-control" id="myInput" type="text" placeholder="Search..">
<li><a href="#">HTML</a></li>
<li><a href="#">CSS</a></li>
<li><a href="#">JavaScript</a></li>
<li><a href="#">jQuery</a></li>
<li><a href="#">Bootstrap</a></li>
<li><a href="#">Angular</a></li>
</ul>
</div>
</div>
<script>
$(document).ready(function(){ $("#myInput").on("keyup", function() { var value = $(this).val().toLowerCase();
$(".dropdown-menu li").filter(function() { $(this).toggle($(this).text().toLowerCase().indexOf(value) > -1)
});
});
});
</script>
</body>
</html>