CSS, PHP, mySQL Loop - change td colour depending on variable - php

Question

Having an issue with assigning a td style class, depending on a variable from mySQL. I have a field called 'Avail' so when a seat is available, the seat should turn green. However, nothing is happening so far when I run it.
Have created the simple classes on the same html sheet but it doesn't seem to apply to any of the data.
CSS Class Definitions >>
<style>
.available {
background-color: green;
}
.unavailable {
background-color: red;
}
</style>
Code to show when style will be applied >>
<table>
<tr>
<th>Seats</th>
<tr>
<tr>
<?php
$c = 0; // Our counter
foreach($res as $row) {
$Avail = 'Avail';
$seatColour = null;
if($Avail == 0)
{
$seatColour = '.available';
} else
{
$seatColour = '.unavailable';
}
if($c % 20 == 0 && $c != 0) // If $c is divisible by $n...
{
// New row
echo '</tr><tr>';
}
$c++;
?>
<td style="$seatColour">
<form method="POST" name="Seating" action="SWG.php">
<?php echo $row['Seat']; ?> <?php echo $row['Avail']; ?>
<input type="checkbox" name="Seat[]" value="<?php echo $row['Seat'];?>"/>
</td>
<?php
}
?>
</tr>
</table>
Would really appreciate it if someone could point out where I'm wrong / how I'm assigning it incorrectly.

Answer 1

There seem to be several issues with your code:
$Avail = 'Avail';
$seatColour = null;
if($Avail == 0)
In the above code, you assign $Avail a string, and then you check whether it's zero. I'm assuming this is not deliberate. Maybe you want to assign the database value here (instead of a string)?
$seatColour = '.available';
You probably want to do $seatColour = "available". We're not in jQuery so no need for the dot.
td style="$seatColour"
You probably want to do <td class="<?php echo $seatColour ?>"> over here

Answer 2

Use class attribute instead of style in td and remove . from $seatColour as follows:
<table>
<tr>
<th>Seats</th>
<tr>
<tr>
<?php
$c = 0; // Our counter
foreach($res as $row) {
$Avail = 'Avail';
$seatColour = null;
if($Avail == 0)
{
$seatColour = 'available';
} else {
$seatColour = 'unavailable';
}
if($c % 20 == 0 && $c != 0) // If $c is divisible by $n...
{
// New row
echo '</tr><tr>';
}
$c++;
?>
<td class="$seatColour"><form method="POST" name="Seating" action="SWG.php">
<?php echo $row['Seat']; ?> <?php echo $row['Avail']; ?>
<input type="checkbox" name="Seat[]" value="<?php echo $row['Seat'];?>"/>
</td>
<?php } ?>
</tr>
</table>

Answer 3

instead of null try -1 .
or you put name/value for th.