<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="container">
<div class="row">
<nav class="navbar navbar-default">
<div class="nav nav-justified navbar-nav">
<form class="navbar-form navbar-search" role="search">
<div class="input-group">
<div class="input-group-btn">
<button type="button" class="btn btn-search btn-default dropdown-toggle" data-toggle="dropdown">
<span class="glyphicon glyphicon-search"></span>
<span class="label-icon">Search</span>
<span class="caret"></span>
</button>
<ul class="dropdown-menu pull-left" role="menu">
<li>
<a href="#">
<span class="glyphicon glyphicon-user"></span>
<span class="label-icon">Search By User</span>
</a>
</li>
<li>
<a href="#">
<span class="glyphicon glyphicon-book"></span>
<span class="label-icon">Search By Organization</span>
</a>
</li>
</ul>
</div>
<input type="text" class="form-control">