I create a very simple dropdown with sub level items in bootstrap 3 as below.
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button">File</a>
<ul class="dropdown-menu">
<li><a href="#">Company</a></li>
<li class="dropdown">
<a href="#" data-toggle="dropdown" class="dropdown-toggle">Utilities<span class="pull-right">»</span></a>
<ul class="dropdown-menu">
<li>Item1</li>
<li>Item2</li>
</ul>
</li>
<li><a href="#">Services</a></li>
</ul>
</li>
</ul>
</div>
I already include bootstrap.css, jquery.js adn bootstrap.js already. For the first level it works fine, but the second level does not work. I don't know why.