bootstrap angular dropdown nav

dropdownnav.html

<li ng-class="{ open : isOpen }">
  <a href="#" prevent-default="" ng-click="isOpen = !isOpen">Dropdown <span class="caret"></span></a>
  <ul class="dropdown-menu">
    <li ><a href="#">Action</a></li>
    <li><a href="#">Another action</a></li>
    <li><a href="#">Something else here</a></li>
    <li role="separator" class="divider"></li>
    <li class="dropdown-header">Nav header</li>
    <li><a href="#">Separated link</a></li>
    <li><a href="#">One more separated link</a></li>
  </ul>
</li>