twitter bootstrap - Navbar collapse is not working in mobile version? -


my bootstrap navbar collapse not working in mobile version.

here code:

<nav class="navbars  navbar-inverse">     <div class="row">         <div class=" col-xs-12 ">             <div class="navbar-header " role="navigation">                 <button type="button" class="navbar-toggle pull-left" data-toggle="collapse" data-target="#mynavbar">                  <span class="icon-bar"></span>                   <span class="icon-bar"></span>                   <span class="icon-bar"></span>                    </button>             <div class="collapse navbar-collapse" id="mynavbar">                 <ul class="nav  navbar-nav  ">                    <li><a href="<?= site_url('api/about_us') ?>"> us</a></li>                    <li ><a href="<?= site_url('api/home') ?>"><span class="glyphicon glyphicon-home"></span>  home</a></li>                    <li><a href="<?= site_url('api/regis') ?>"><span class="glyphicon glyphicon-user"></span> volunteer registration</a></li>                    <li><a href="<?= site_url('api/postingcomplaints') ?>"><span class="glyphicon glyphicon-comment"></span> post complaints</a></li>                    <li><a href="#" class=" pull-right"   data-toggle="modal" data-target="#mymodal2"><span class="glyphicon glyphicon-map-marker"></span> track complaints</a></li>                    <li><a href="<?= site_url('api/contact') ?>"><span class="glyphicon glyphicon-phone-alt"></span> contact us</a></li>                    <li> <a href="#" class=" pull-right"   data-toggle="modal" data-target="#mymodal"><span class="glyphicon glyphicon-log-in"></span>login</a></li>                  </ul>              </div>             </div>         </div>     </div>    </nav> <!--nav end-->

can tel me doing wrong?

you need set 1. jquery , 2. javascript (order important!) in <head> section.

<head>     <script src="https://code.jquery.com/jquery-2.1.4.js"></script>     <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script> </head>

demo


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