Multiple Field in ComboBox

[putusundika]

this is how i use multiple field as textfield in a single combobox. It works for me  but Please CMIIW... 

Code:

dtbase.php :
$rs = mysql_query("select id_customer,concat(firstname_customer,' ',lastname_customer) AS name 
        FROM customer order by firstname_customer ASC");
$items = array();
while($row = mysql_fetch_object($rs)){
	array_push($items, $row);
}
echo json_encode($items);

-------

<input name="id" style="width:300px" class="easyui-combobox" url="dtbase.php" 
valueField="id_customer" textField="name" required="true">

regards