I have written the following code in PHP to generate two dropdown boxes on the same page.
The first dropdown box gets value from a MySQL table. This dropdpwn box contains some UserIDs. The second dropdown box contains some dates which should be based on the UserID that is selected in the first dropdown box. I have filled the 2nd dropdown box with all the dates in the MySQL table, but, it should be filtered by the UserID which is selected on the first dropdown box.
Just to inform, with these two values from these two dropdown boxes in this PHP page, I have posted them by pressing the submit button to another PHP page to process some other work.
I would appreciate if you can help me to fill the second dropbox only based on the UserID selected on the first dropbox. Here is the code I have written to display and fill those dropdown boxes. Can you please inform me, what part of the code I should modify and I would appreciate if you can show me the modification code as well. I am a newbie in PHP, that's why I am asking for code level help.
My code:
<html>
<head>
<title>
Search Alert DB
</title>
<body>
<br />
<?php>
$con = mysql_connect("localhost","root","root"); // (host, user,pwd)
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("mysql", $con);
echo "<p> Search Alert database </p>";
echo "<br />";
$result = mysql_query("SELECT distinct(UserID) FROM tblAlertLogSpecificUsersDayStatusFinal_1");
$options="";
echo "<form action='Search_AlertDB_process.php' method='POST'>
";
//echo "Please choose a user: ";
echo "Please choose a user: <select name = userid>";
echo "<option>-Select-";
while ($row = mysql_fetch_array($result))
{
$userid=$row["UserID"];
$options ="<option value = \"$userid\">$userid </option>";
echo "$options";
}
echo "</select>";
echo "<br />";
echo "<br />";
$dayresult = mysql_query("SELECT distinct(Occurred_date) FROM tblAlertLogSpecificUsersDayStatusFinal_1");
$dayoptions="";
echo "Please pick a date:<select name = day>";
echo "<option>-Select-";
while ($row=mysql_fetch_array($dayresult)) {
$day=$row["Occurred_date"];
$dayoptions ="<option value = \"$day\">$day </option>";
echo "$dayoptions";
//$options.="<OPTION VALUE=\"$id\">".$day;
}
echo "</select>";
echo "<br />";
mysql_close($con);
?>
<br />
<input type="submit" name="Submit" value="Search" /> <br /> <br />
</form>
</body>
</html>
