gistfile1.txt

            $scope.$watch('suggestions', function (value) {
                if (value.length == 0) {
                   element.find('.autocomplete-suggestions').scrollTop(0);
                }
            });

            $scope.$watch('selectedSuggestion', function (value) {
                var suggestionHeight = (element
                    .find('.suggestion') || {})
                    .height();

                element.find('.autocomplete-suggestions')
                    .scroll((value - 1) * suggestionHeight);
            });