<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/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-inverse navbar-fixed-top"> <div class="navbar-header"> <a class="navbar-brand" href="#">Brand</a> <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> </div> <div class="navbar-collapse collapse"> <ul class="nav navbar-nav"> <li class="active"><a href="#">Home</a></li> <li><a href="#about">About</a></li> <li><a href="#contact">Contact</a></li> </ul> <div class="navbar-header navbar-right"> <p class="navbar-text"> <a href="#" class="navbar-link">Username</a> </p> </div> </div> </nav> <div class="container-fluid"> Current viewport width:<span id="monitor"></span> </div>

body { padding-top:70px; } @media (max-width: 1200px) { .navbar-header { float: none; } .navbar-left,.navbar-right { float: none !important; } .navbar-toggle { display: block; } .navbar-collapse { border-top: 1px solid transparent; box-shadow: inset 0 1px 0 rgba(255,255,255,0.1); } .navbar-fixed-top { top: 0; border-width: 0 0 1px; } .navbar-collapse.collapse { display: none!important; } .navbar-nav { float: none!important; margin-top: 7.5px; } .navbar-nav>li { float: none; } .navbar-nav>li>a { padding-top: 10px; padding-bottom: 10px; } .collapse.in{ display:block !important; } }

$('#monitor').html($(window).width()); $(window).resize(function() { var viewportWidth = $(window).width(); $('#monitor').html(viewportWidth); });