ใส่ onchange ตรงไหน เปลี่ยนรูปแบบใหม่ ครับ เป็น onchange

<?php 
	include 'connect.php';
	$connectionInfo = array("Database"=>$dbName, "UID"=>$userName, "PWD"=>$userPassword, "MultipleActiveResultSets"=>true);
	$conn = sqlsrv_connect( $serverName, $connectionInfo);
	$params = array();
	$options =  array( "Scrollable" => SQLSRV_CURSOR_KEYSET );
	if( $conn === false ) {
      die( print_r( sqlsrv_errors(), true));
	}
	?>

<meta http-equiv="X-UA-Compatible" content="IE=11"/>
<script language="javascript">
	/*function fncAlert()
	{
		var keep=document.getElementById("game").value;
		var voteable = (keep != "a") ? "not a":"yes a";
		alert(voteable + " to vote.");

			
	}*/
</script>

<?php 
		//error_reporting(0);
		$item=$_POST["item"];
		//echo $item;
		?>

<form name="form" method="post" id="form1" name="form1"  action="add8.php">
<table border="1">
          <tr>
			
			<td><input id="item" name="item" list="itemlist"  style="width: 80px" value="<?php error_reporting(0); echo $_POST['item'];?>">
			<datalist id="itemlist" >
			<?php
					$itsql="SELECT top 10000 * FROM ITEM";
					$itquery=sqlsrv_query($conn, $itsql);														
					while($result = sqlsrv_fetch_array($itquery))
					{?>
						<option><?php echo $result["ITEM"];?></option>
					<?php }
			?>
			</datalist></td>
              <?php $itsql="SELECT * FROM ITEM where item='".$item."'";
			$itquery=sqlsrv_query($conn, $itsql);														
			$result = sqlsrv_fetch_array($itquery); ?>
					
			<td><input type="text" name="textfield" id="numtxt" style="width:400px" value="<?php error_reporting(0); 
				
			$arr=$result["DESCRIPTION"];
			echo $arr; ?> "> </td>	
					   
			<td><input type="text" name="mrpc" id="numtxt" style="width:400px" value="<?php error_reporting(0); 
															
			$arr=$result["MRPC"];
			echo $arr; ?> " </td>
    	<!--<td><input type="text" name="text<?=$i?>"></td>-->
			<!--<td><input id="item" name="item" list="itemlist" style="width: 80px"  onKeyUp="document.form.textfield.value=' 	
																							/*$itsql="SELECT * FROM ITEM where item='".$item."'";
																							$itquery=sqlsrv_query($conn, $itsql);														
																							$result = sqlsrv_fetch_array($itquery);	
																							$arr=$result["DESCRIPTION"];																								
																							echo $arr;	*/																				
																							 ?>';">
			<datalist id="itemlist" >
			
					/*$itsql="SELECT top 100 * FROM ITEM";
					$itquery=sqlsrv_query($conn, $itsql);														
					while($result = sqlsrv_fetch_array($itquery))
					{
						?>
							<option>echo $result["ITEM"];?></option>
						
					}*/
			
			</datalist></td>
			
			<td><input type="text" name="item" onKeyUp="document.form.textfield.value='<?php $itsql="SELECT * FROM ITEM where item='".$_POST['item']."'";
																							$itquery=sqlsrv_query($conn, $itsql);														
																							$result = sqlsrv_fetch_array($itquery);	
																							$arr=$result["DESCRIPTION"];																								
																							echo $_POST['item'];																					
																							 ?>';"></td>
			<td><input type="text" name="textfield" id="numtxt" style="width:400px"></td>-->

			
			</tr>


</table>
<button type="submit" value="Submit">Refresh</button>
</form>