jquery autocomplete return id instead of text

gistfile1.txt

var select_function = function(event, ui) {
       if ($(this).data("event-name") == undefined) {
               $(this).data("event-name", $(this).attr("name"));
       }
       if(ui.item) {
               var hidden_location;
               // currently only care if there's a child, not checking the childs type
               if ($(this).children().size() == 0 ) {
                       hidden_location = $('<input type=hidden></input>')
                       hidden_location.attr("name", $(this).data("event-name"))
                       $(this).append(hidden_location);
               } else {
                       hidden_location = $(this).children();
               }
               hidden_location.attr("value", ui.item.id);
               $(this).attr("name","");
       }
}

$(function() {
	setAutoComplete($("#my-textfield-that-needs-autocomplete-id"));
});

function setAutoComplete(element) {
       element.autocomplete({
			   source: "<%= some url...%>",
			   minLength: 3,
			   select: select_function	
       });
}



});