AJAX/JQUERY not updating MySQL row - php

Question

I am currently trying to update a textarea when a user clicks elsewhere. I'm not well-versed in AJAX and Jquery. However, the script doesn't seem to be updating the row in the DB.
Jquery/Text area:
<textarea id="<?php echo $item_id; ?>_textarea"><?php echo $notes; ?></textarea>
<script type="text/javascript">
$('<?php echo $item_id; ?>_textarea').on('blur',function () {
var notesVal = $(this).val(), id = $(this).data('id');
var itemVal = <?php echo $item_id; ?>;
$.ajax({
type: "POST",
url: "updateNotes.php",
data: {notes:notesVal , id:id, itemId:itemVal},
success: function(msg) {
$('#'+id).html(msg);
}
})
});
</script>
updateNotes.php:
<?php
include('db_connect.php');
include('order_functions.php');
$email = $_SESSION['username'];
$cartId = getcartid($mysqli, $email);
$notes = $_POST['notes'];
$itemID = $_POST['itemId'];
$query = "UPDATE `rel` SET `notes` = '$notes' WHERE `cart_id` = '$cartId' && `id_item` = '$itemID'";
$result = $mysqli->query($query) or die($mysqli->error.__LINE__);
if(result) {
return "Notes Updated";
}
?>

Answer 1

You forgot the $ in your last if-statement in your php-code and you should use "echo" (or likewise) instead of "return" as you are not in a function.
<?php
include('db_connect.php');
include('order_functions.php');
$email = $_SESSION['username'];
$cartId = getcartid($mysqli, $email);
$notes = $_POST['notes'];
$itemID = $_POST['itemId'];
$query = "UPDATE `rel` SET `notes` = '$notes' WHERE `cart_id` = '$cartId' && `id_item` = '$itemID'";
$result = $mysqli->query($query) or die($mysqli->error.__LINE__);
if($result) {
echo "Notes Updated";
}
?>
Your html/javascript-code is a bit wrong. This is how i guess you wanted it to work:
<div id="<?php echo $item_id; ?>_div">
<textarea id="<?php echo $item_id; ?>_textarea" data-id="<?php echo $item_id; ?>"><?php echo htmlentities($notes); ?></textarea>
</div>
$('#<?php echo $item_id; ?>_textarea').on('blur', function () { // don't forget # to select by id
var id = $(this).data('id'); // Get the id-data-attribute
var val = $(this).val();
$.ajax({
type: "POST",
url: "updateNotes.php",
data: {
notes: val, // value of the textarea we are hooking the blur-event to
itemId: id // Id of the item stored on the data-id
},
success: function (msg) {
$('#' + id + '_div').html(msg); //Changes the textarea to the text sent by the server
}
});
});
Good luck