angularjs - keyboard navigation in the Bootstrap dropdown-menu -

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as know using boostrap drop-down components not able select element pressing keyboard letter. using following code use directive

myapp.directive('keyletterpressed', function ($timeout) {    return function (scope, element, attrs) {     element.bind("keydown keypress", function (event) {              var target = $(event.target);             $(target).trigger('focus');      });    }; });

but not complete, not working, can tell me how go element have same letter of list ? have put directive in ul element ? because using on li

<li ng-repeat="v in values" keyletterpressed>{{v.name}}</li>

another answer this, adding directive ul element

 app.directive('booststrapdropdown',  function () {   return {       restrict: 'a',       link: function (scope, element, attr) {           console.log('linked');           element.parent().bind('keypress', function (e) {               children = element.children();               children.removeclass("active");               (var = 0; < children.length; i++) {                   var letter = string.fromcharcode(e.which);                   var charat = children[i].textcontent.replace(/\s+/, '').charat(0);                   if (charat === letter) {                       children[i].classname += " active";                       element[0].scrolltop = children[i].offsettop;                   }               }           });       }   };   });      <div class="btn-group" dropdown>     <button type="button" class="btn btn-primary dropdown-toggle"              dropdown-toggle>       button dropdown <span class="caret"></span>     </button>     <ul booststrap-dropdown class="dropdown-menu scrollable-menu" role="menu" >       <li ng-repeat="v in values">         <a href="#">{{v.name}}</a>       </li>     </ul>   </div>

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