Can anybody suggest what I am missing in below html to add submenu to bootstrap dropdown?
<div class="btn-group" uib-dropdown>
<button id="split-button" type="button" class="btn btn-danger">Action</button>
<button type="button" class="btn btn-danger" uib-dropdown-toggle>
<span class="caret"></span>
<span class="sr-only">Split button!</span>
</button>
<ul class="uib-dropdown-menu" role="menu" aria-labelledby="split-button">
<li><a ui-sref="a">a</a></li>
<li><a ui-sref="b">b</a></li>
<li><a ui-sref="c">c</a></li>
<li><a ui-sref="d">d</a></li>
<li class="dropdown-submenu">
<a href="#">e</a>
<ul class="dropdown-menu">
<li><a ui-sref="e1">e1 (sub of e)</a></li>
</ul>
</li>
</ul>
</div>
EDIT 1
Added plunker