how to retain the values in the sub process?

tayys · December 27, 2011

hi there,

I have a chained combo boxes. I manage to get the values for the sub process using onchange event.My problem here is how can I retain the values in the sub process combo box after the page is loaded?

main.php

<?php
require_once 'connectDB.php';

$sub_id = $_GET['sub_id'];
$id = $_SESSION['process_id'];

$sql = " SELECT * FROM tb_process ORDER BY pro_id ASC";
$result = mysql_query($sql) or die(mysql_error());

$sql = "SELECT tb_record.rec_tpcd, tb_record.rec_part, tb_record.rec_code, tb_record.rec_vendor, tb_record.rec_location, tb_record.rec_remark,
tb_sub_process.sub_name, tb_process.pro_name
FROM tb_record
LEFT JOIN tb_sub_process
ON tb_record.sub_id=tb_sub_process.sub_id
LEFT JOIN tb_process
ON tb_sub_process.pro_id=tb_process.pro_id
WHERE tb_sub_process.sub_id = '$sub_id'";
$result2 = mysql_query($sql);
$row = mysql_fetch_assoc($result2);
$pro_name = $row['pro_name'];
$sub_name = $row['sub_name'];
?>
<html>
<head>
<script type="text/javascript" src="js/ajax.js"></script>
<script type="text/javascript" src="js/jquery-1.2.3.min.js"></script>
<script type="text/javascript">	

$(document).ready(function() {
$("#selectProcess").change(function() { 
	var processID = $(this).val();
	if(processID > 0)
	{
		$("#txtID").val(processID);
		$("#selectSubProcess").load('getSub.php?processID='+processID);
	}
});

$("#selectSubProcess").change(function() { 
	var subProcessID = $(this).val();
	if(subProcessID > 0)
	{
		window.location = 'main.php?sub_id='+subProcessID;
	}
});
});
</script>

</head>
<body>
<form action="" method="post">
<table>
	<tr>
		<td>Process: </td>
		<td>
		<select id="selectProcess" name="selectProcess">
		     	<option value="0" selected="selected">---SELECT PROCESS---</option>
		     	<?php 
			while ($row = mysql_fetch_array($result)) 
			{
			$process_id = $row['pro_id'];
			$process_name = $row['pro_name'];	
			$select = ($id == $process_id) ? 'selected="selected"' : NULL;  
			echo "<option value='$process_id' $select>$process_name</option>";
		        }
		        ?>
		</select>
		</td>
	</tr>
	<tr>
		<td>Sub Process: </td>
		<td>
			<select id="selectSubProcess" name="selectSubProcess" >
				<option>SELECT PROCESS FIRST</option> 
			</select>
		</td>
	</tr>
</table>
</form>
<table border=1>
<?php 
while($row = mysql_fetch_assoc($result2))
{
	extract($row);
	$imageDir1="images/".$rec_tpcd.".jpg";
	$info = @getimagesize($imageDir1);

	if((bool)$info)
	{
		$imageDir="images/".$rec_tpcd.".jpg";
	}
	else
	{
		$imageDir="images/NoPhoto.jpg";
	} 

	if ($col == 0)
	{
		$display .= "<tr>";
	}		

	$col++;
	if ($col == 1)
	{
		$col = 0;
		$display .= "</td>";
	}

	echo "<tr>
			<td>										
			<img src=$imageDir width='220' height='170' onClick=\"window.open('$imageDir', 'popup','height=500,width=800,scrollbars=yes,resizeable=yes status=yes'); return false\" target=\"_blank\"> 
			</td>
			<td>
				<table style='overflow:auto; width:325px;'>	
					<tr>
						<td width='80' valign='top'>Name</td>
						<td valign='top'>:</td>
						<td valign='top' colspan='2'>$rec_part</td>
					</tr>
					<tr>
						<td valign='top'>Code</td>
						<td valign='top'>:</td>
						<td valign='top' colspan='2'>$rec_code</td>
					</tr>													
					<tr>
						<td>TPCD</td>
						<td>:</td>
						<td colspan='2'>$rec_tpcd</td>
					</tr>
					<tr class='style15'>
						<td>Vendor</td>
						<td>:</td>
						<td colspan='2'>$rec_vendor</td>
					</tr>  
					<tr>
						<td>Location</td>
						<td>:</td>
						<td colspan='2'>$rec_location</td>
					</tr>
					<tr>
						<td>Remarks</td>
						<td>:</td>
						<td>$rec_remark</td>
						<td align='right'>
						<input type='image' name='change[$rec_tpcd]' src='library/cart add.png' width='20' height='20' value='Add To Order List >'/>
						</td>
					</tr> 
				</table>
			</td>
		  </tr>";
	}
	?>
</table>
</body>
</html>

getSub.php

<?php
require_once 'connectDB.php';

if(isset($_GET['processID']))
{
$process_id = $_GET['processID'];
$sql = " SELECT * FROM tb_sub_process WHERE pro_id = '$process_id' ORDER BY sub_id ASC";
$result = mysql_query($sql) or die(mysql_error());
$_SESSION['process_id'] = $process_id;
echo "<option>---------------------SELECTION--------------------</option>"; 
while($row = mysql_fetch_assoc($result))
{
	$sub_process_id = strtoupper($row['sub_id']);
	$sub_process_name = strtoupper($row['sub_name']); 
	echo "<option value='$sub_process_id'>$sub_process_name</option>";
}
}
?>

AGuyWithAthing · December 27, 2011

Either, you could make php print out a set of javascript variables representing the nested values or on each creation of the form elements kick off an ajax request to check if it should be set.

tayys · December 28, 2011

tq AGuyWithAthing

but where should I print out the set of javascript variables?

is there any relevant example I can refer to?

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how to retain the values in the sub process?

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