javascript - Focus on bootstrap dropdown -

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i using bootstrap dropdown, want focus on dropdown can use keyboard navigate on list. way using jquery? tried use $('#myulid').focus() , not working.

i able open dropdown, not focus on it. 

        <button id="time_btn" type="button"                 class="btn btn-reverse dropdown-toggle"                 data-toggle="dropdown">             </button>             <ul class="dropdown-menu" role="menu">                 <li ng-repeat="item in items" ><a><span>test</span></a></li>         </ul>

just add 

<ul  tabindex='1'> .... </ul>

then add .focus() method


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