<label>Name des Leiters:</label>
<select name="leaderID" id="selectLeaderID">

　　<option ng-repeat="manager in managers" value="leader_id={{manager.id}}&leader_name={{manager.name}}&leader_email={{manager.email}}" callback-on-end>{{manager.name}}</option>

</select>

  app.directive("callbackOnEnd", function($timeout) {

      return {

          restrict: "A",

          link: function(scope, element, attrs) {

              if (scope.$last) {

                $timeout(function(){

                  var select = document.getElementById("selectLeaderID");

                  for(var i = 0;i < select.options.length;i++){

                        var parts = [];

                        parts = select.options[i].value.split('&');

                        if(parts[0].substr(10) == scope.selectLeaderID){

                            select.options[i].selected = true;

                        }

                    }

                });

              }

          }

      };

  });