<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <nav class="navbar navbar-default navbar-fixed-top" id="gloup" role="navigation"> <div class="container"> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> <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="#">Project name</a> </div> <div id="navbar" class="navbar-collapse collapse"> <ul class="nav navbar-nav"> <li ><a href="#" class="search-button" data-toggle="dropdown" role="button" aria-expanded="false"><span class="glyphicon glyphicon-search"></span></i></a></li> <form class="navbar-form navbar-left"> <input class="form-control input-search" placeholder="Search" type="text"> </form> </ul> </div><!--/.nav-collapse --> </div> </nav>

.input-search{ z-index:-1; position:absolute; width:0; opacity:0; } .input-search:focus, .input-search:active{ position:absolute; opacity:1; display:block; width:50%; top:350px; left:25%; height:120px; z-index:1; transition: height ease-in 0.5s; font-size:4em; } @media (max-width: 960px) { .input-search:focus{ width:70%; left:15%; } } @media (max-width: 768px) { .input-search:focus{ width:100%; left:0; } }

$(document).ready(function () { $(".search-button").click(function(e){ $(".input-search").focus(); return false; }); });