How to display echo if user has not selected from a drop down menu

Question

In my code below I have 2 drop down menus. One is a \"Course\" drop down menu and the other is a \"Modules\" drop down menu:

Below is the code:

Answer 1

Change your form tag

to

It's a good idea to validate on serverside too, just add a little code in your existing PHP if you want to check values on serverside:

prepare($sessionquery);
// You only need to call bind_param once
$sessionqrystmt->bind_param("si",$moduleId,$userid);
// get result and assign variables (prefix with db)

$sessionqrystmt->execute(); 

$sessionqrystmt->bind_result($dbSessionId,$dbSessionDate,$dbSessionTime, $dbModuleId, $dbTeacherId);

$sessionqrystmt->store_result();

$sessionnum = $sessionqrystmt->num_rows();   

if($sessionnum ==0){
echo "
Sorry, You have No Sessions under this Module
";

}