I want to delete a session from a drop down menu. The user will select a session from the drop down menu and then click on the delete button, this should then delete session in the database. The problem is that if I click on the delete button, it then comes up with an undefined index errors stating sessionsDrop are undefined in line 200 My question is:
1: How can I get rid of the undefined index error in code below 2: How and where do you write the if statement so that if the deletion was successful, it will echo "Session ... was Deleted" else if it hasn't been delete then display echo "An error occured, Session ... was not deleted"
Below is the code:
$sessionnum = 0;
if (isset($_POST['modulesubmit'])) {
if($_REQUEST['modulesDrop']==''){
echo "Please Select a Module from the Drop Down Menu Above";
}
else{
var_dump($_POST['modulesDrop']);
$sessionquery = "
SELECT SessionId, SessionDate, SessionTime, ModuleId
FROM Session
WHERE
(ModuleId = ?)
ORDER BY SessionDate, SessionTime
";
$sessionqrystmt=$mysqli->prepare($sessionquery);
// You only need to call bind_param once
$sessionqrystmt->bind_param("s",$_POST['modulesDrop']);
// get result and assign variables (prefix with db)
$sessionqrystmt->execute();
$sessionqrystmt->bind_result($dbSessionId,$dbSessionDate,$dbSessionTime, $dbModuleId);
$sessionqrystmt->store_result();
$sessionnum = $sessionqrystmt->num_rows();
$dataArraySession = array();
while ( $sessionqrystmt->fetch() ) {
$dataArraySession[$dbSessionId]['SessionDate'] = $dbSessionDate;
$dataArraySession[$dbSessionId]['SessionTime'] = $dbSessionTime;
}
$sessionHTML = "";
$sessionHTML .= '<select name="session" id="sessionsDrop">'.PHP_EOL;
$sessionHTML .= '<option value="">Please Select</option>'.PHP_EOL;
foreach ($dataArraySession as $sessionId => $sessionData) {
$sessionHTML .= "<option value='$sessionId'>" . $sessionId . " - " . $sessionData['SessionDate']. " - " . $sessionData['SessionTime'] ."</option>".PHP_EOL;
}
$sessionHTML .= '</select>';
}
if ($sessionnum > 0) {
?>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<p>Sessions: <?php echo $sessionHTML; ?><input id="sessionSubmit" type="submit" value="Delete" name="sessionsubmit" /></p>
</form>
<?php
}
else {
echo "<p>Sorry, You have No Sessions under this Module</p>";
}
}
if (isset($_POST['sessionsubmit'])) {
if($_REQUEST['sessionsDrop']==''){ //line 200 where undefined index occurs
echo "Please Select a Session from the Drop Down Menu Above to Delete a Session";
}
else{
var_dump($_POST['sessionsDrop']);
$sessiondel = $_POST['sessionsDrop'];
$sessiondeletesql = " DELETE sess
FROM Session AS sess
WHERE sess.SessionId = ?";
if (!$delete = $mysqli->prepare($sessiondeletesql)) {
// Handle errors with prepare operation here
}
//Dont pass data directly to bind_param store it in a variable
$delete->bind_param("s", $sessiondel);
$delete->execute();
if ($delete->errno) {
// Handle query error here
}
$delete->close();
echo "Session $sessiondel was Deleted";
}
}
?>
