Search form with php - php

Question

I get the following form my database which contain for year 2011 week 1 to week 20 and for year 2012 currently week 1. I want my user to choose 2011 first and then call the week to choose for example so that they dont choose for example week 10 and year 2012( which are not yet available).Any help most welcome.
<form name="myform" action="http://www.website.com/displaybook.php" method="get">
<select size="1" name="d">
<?
$sql=mysql_query("SELECT DISTINCT (Week) FROM data ORDER BY Week ASC");
while($row = mysql_fetch_array($sql))
{
echo "<option value='". $row['Week']."'>Week - ". $row['Week']."</option>";
}
?>
</select>
<select size="1" name="y">
<?
$sql=mysql_query("SELECT DISTINCT (Year) FROM data ORDER BY Year Desc");
while($row = mysql_fetch_array($sql))
{
echo "<option value='". $row['Year']."'>Season - ". $row['Year']."</option>";
}
?>
</select>
<input type="submit" value="Get data">
</form>

Answer 1

You need to put the year select before the day select... It will ajust the GET string automaticaly... Then, you create a little javascript to enable the second select when the first is selected, like this:
<script type="text/javascript">
function getWeek()
{
if (document.getElementById('y').value != '')
{
document.getElementById('d').disabled = ''; // this will enable the select
}
}
</script>
And in your HTML:
<form name="myform" action="http://www.website.com/displaybook.php" method="get">
<select size="1" name="y" onchange="getWeek()">
<?
$sql=mysql_query("SELECT DISTINCT (Year) FROM data ORDER BY Year Desc");
while($row = mysql_fetch_array($sql))
{
echo "<option value='". $row['Year']."'>Season - ". $row['Year']."</option>";
}
?>
</select>
<select size="1" name="d" id="d" disabled="disabled">
<?
$sql=mysql_query("SELECT DISTINCT (Week) FROM data ORDER BY Week ASC");
while($row = mysql_fetch_array($sql))
{
echo "<option value='". $row['Week']."'>Week - ". $row['Week']."</option>";
}
?>
</select>
<input type="submit" value="Get data">
</form>
Something like this should work great!