PHP undefined Error while passing data from Ajax - php

Question

Simply i want to pass Numeric id to Php page and Using $_POST['id'] i want use it, But Getting Undefined error. check screen shot https://imgur.com/a/M1v4mEX and check code below
===>edit.php
$('#update').click(function(){
var serialData = new FormData($("#regForm")[0]),
s = location.search.split('='),
searchId = s[s.length-1];
console.log(serialData);
console.log(searchId);
serialData.append('id',9);
$.ajax({
method:'POST',
url:'update.php',
dataType:'json',
data: {id:9},
success:function(jsonObj){
console.log(jsonObj);
}
});
});
==>update.php
<?php
if(isset($_POST['submit'])){
var_dump($_POST['id']);
exit();
}
?>

Answer 1

You forgot to change the id value to send in parameter to the dynamic value from the location.search
Also think about adding e.preventDefault(); because you work on form submission.
I think that serialData can be removed cause it doesn't have affect the current code logic
Here is the working script
<script>
$('#update').click(function(e) {
e.preventDefault();
var s = location.search.split('=');
var searchId = s[s.length-1];
// Verify the current ID passed on search parameter
console.log(searchId);
$.ajax({
method:'POST',
url:'update.php',
dataType:'json',
data: { 'id': searchId },
success:function(jsonObj){
console.log(jsonObj);
}
});
});
</script>