selectRoomListItem = function() {
            var parent = $(this).parent(),
                roomId = parent.data('room-id'),
                roomName = parent.data('room-name');

            if (self.$messages[roomId]) {
              self.focusTab(roomId);
            } else {
              self._chat.enterRoom(roomId, roomName);
            }
            return false;
          }
Binds room list dropdown to populate room list on-demand.