06-04-2008, 12:46 PM
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#1 (permalink)
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The Visitor
Join Date: Jun 2008
Posts: 2
Thanks: 1
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Horizontal nested loop problem
Hi guys!
I’m currently working on a grade tracker and I’ve reached a dead end where I need some help.
Basically, I’ve got a mysql query that returns the right results I need from the database and so far, so good. The problem starts when I try to output the results of the query through a while loop. To be more precise, the query returns the data in the following form:
HTML Code:
Assignment_ID | Assignment Title | Criteria covered | Date submitted | Status
1 Staff research P1 2008-03-12 Pass
1 Staff research P2 2008-03-12 Pass
1 Staff research P3 2008-03-12 Pass
1 Staff research M1 2008-03-12 Pass
1 Staff research M2 2008-03-12 Pass
1 Staff research M3 2008-03-12 Pass
1 Staff research D1 2008-03-12 Pass
1 Staff research D2 2008-03-12 Pass
1 Staff research D3 2008-03-12 Pass
2 Games techniques P4 2007-12-03 Merit
2 Games techniques P5 2007-12-03 Merit
2 Games techniques P6 2007-12-03 Merit
2 Games techniques M4 2007-12-03 Merit
2 Games techniques M5 2007-12-03 Merit
2 Games techniques M6 2007-12-03 Merit
2 Games techniques D4 2007-12-03 Merit
2 Games techniques D5 2007-12-03 Merit
Well, what I want in the html output is to hide the redundant data and display horizontally just the bits that changes from one iteration of the loop to the next, like this:
HTML Code:
Assignment Title | Criteria covered | Date submitted | Status
Staff research P1, P2, P3, M1, M2, M3, D1, D2, D3 2008-03-12 Pass
Games techniques P4, P5, P6, M4, M5, M6, D4, D5, D6 2007-12-03 Merit
So far I managed to display them vertically and hide away just the repeating Assignment Title by setting a counter as a random variable which I’ve called $lastassigID just before the loop starts and set it to NULL. Later in the while loop I’ve added an IF ELSE statement that check to see if $lastassigID=$assigID from the query. If it does, it echoes an empty table cell, if it doesn't, it echoes the assignment title. Then at the end of the loop I set $lastassigID to be equal to $assigID. Here is the code...
PHP Code:
<?php
if (mysql_num_rows($result)==0){
echo "<p>  </p><span class='heading'>No assignments have been issued for this module!</span>";
}
else{
?>
<table width="100%" border="0" cellspacing="0" cellpadding="5">
<tr valign="top" class="heading">
<td width="25%">Assignment Title</td>
<td width="40%">Criteria</td>
<td width="15%">Date Sub </td>
<td width="20%">Status</td>
</tr>
<?php
$row_count = 1;//the counter for colouring the rows
$lastassigID = ''; //the counter for getting the assignment titles
mysql_data_seek($result,0) ;
while ($row = mysql_fetch_array($result,MYSQL_ASSOC)){
$assigID=$row['Assignment_ID'];
$title=$row['Title'];
$datedue=$row['Date_due'];
$datesubmit=$row['Date_submit'];
$grade=$row['Grade_awarded'];
$criteria=$row['Grade'];
$achieved=$row['Achieved'];
if($assigID<>$lastassigID){
$row_count++;
if ($row_count % 2 == 0){
//EVEN
$row_color="#FFFFFF";
}
else{
//ODD
$row_color="#EDEDED";
}
echo '<tr bgcolor="' . $row_color . '">';
echo '
<tr bgcolor="' . $row_color . '">
<td valign="top"><a href="module.php?id='.$assigID.'">'.$title.'</a></td>';
$lastassigID=$assigID; //resetting the counter
}
else {
echo '<tr bgcolor="' . $row_color . '">';
echo '<td valign="top"></td>';
}
echo' <td>'.$criteria.'</td>';// this is the one that outputs my P1, P2, P3, etc…
$date_due = strtotime($datedue);
$date_submit = strtotime($datesubmit);
$today = strtotime($todays_date);
//here is the output for the Date – different colours and messages depending on the time of submission
if (isset($datesubmit) && $date_submit>$date_due){
echo '<TD valign="top"><span class="late">'.$datesubmit.'</span></TD>';
}
elseif (!isset($datesubmit) && $date_due>$today){
echo '<TD valign="top"><span class="unsubmit">Not submitted</span></TD>';
}
elseif (!isset($datesubmit) && $date_due<$today){
echo '<TD valign="top"><span class="overdue">Not submitted</span></TD>';
}
else{
echo '<TD valign="top"><span class="">'.$datesubmit.'</span></TD>';
}
//here is the output for the STATUS, again different colours and messages
if ($grade=="" && $date_due>$date_submit && isset($datesubmit)){
echo '<TD valign="top"><span class="unmarked">Awaiting marking</span></TD></TR>';
}
elseif ($datesubmit=="" && $date_due<$today){
echo '<TD valign="top"><span class="fail">Overdue</span></TD></TR>';
}
elseif ($grade=="" && $date_due>$date_submit){
echo '<TD valign="top"><span class="active">Active</span></TD></TR>';
}
elseif ($grade==""){
echo '<TD valign="top"><span class="unmarked">Awaiting marking</span></TD></TR>';
}
else{
switch($grade){
case "Pass":
echo '<TD valign="top"><span class="pass">Pass</span></TD></TR>';
break;
case "Merit":
echo '<TD valign="top"><span class="pass">Merit</span></TD></TR>';
break;
case "Distinction":
echo '<TD valign="top"><span class="pass">Distinction</span></TD></TR>';
break;
case "Not yet Achieved":
echo '<TD valign="top"><span class="fail">Not yet Achieved</span></TD></TR>';
break;
}
}
}
}
?>
</div>
</body>
</html>
… and here’s the output looking like this:
HTML Code:
Assignment Title | Criteria covered | Date submitted | Status
Staff research P1 2008-03-12 Pass
P2 2008-03-12 Pass
P3 2008-03-12 Pass
M1 2008-03-12 Pass
M2 2008-03-12 Pass
M3 2008-03-12 Pass
D1 2008-03-12 Pass
D2 2008-03-12 Pass
D3 2008-03-12 Pass
Games Techniques P4 2007-12-03 Merit
P5 2007-12-03 Merit
P6 2007-12-03 Merit
M4 2007-12-03 Merit
M5 2007-12-03 Merit
M6 2007-12-03 Merit
D4 2007-12-03 Merit
D5 2007-12-03 Merit
D5 2007-12-03 Merit
Here is where I got stuck: how can I display them horizontally like this?
HTML Code:
Assignment Title | Criteria covered | Date submitted | Status
Staff research P1, P2, P3, M1, M2, M3, D1, D2, D3 2008-03-12 Pass
Games techniques P4, P5, P6, M4, M5, M6, D4, D5, D6 2007-12-03 Merit
I was thinking about a nested loop but then how will the inner loop know when to stop and let the outer loop carry on? I was thinking of setting a similar counter like the one for the title, so that as long as the assignment_ID is the same, the inner loop can carry on, but then how can I output the results horizontally on a single row, then the next row displaying the results of a second iteration of both loops? I’d really appreciate any help. Thanks ever so much.
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