AJAX Call Return PHP Value Empty - php

Question

i have a problem about ajax call, i dont get what exactly why i still getting this empty success call. i tried the past solution to solve this but i don't know what the cause of this.
as you can see this my table then when i click the action of update, delete, or, add, even print_r($_POST) it's still empty.
then when i go to console i got this error.
the value of selected attr still send to the php file
heres my code :
$(document).on('click', '.update', function(){
var user_ID = $(this).attr('id');
$.ajax({
url:"datatable/account/fetch_single.php",
method:"POST",
data:{user_ID:user_ID},
dataType:"json",
success:function(data)
{
console.log(data);
$('#account_modal').modal('show');
$('#username').prop("disabled", true);
$('#username').val(data.user_Name);
$('#email').val(data.user_Email);
$('#pass').val(data.user_Pass);
$('#con_pass').val(data.user_Pass);
$('#level').val(data.level_ID).change();
$('#status').val(data.user_status).change();
$('#action').val('Edit');
$('#operation').val('Edit');
$('.modal-title').text('Edit Account Info');
$('#user_ID').val(user_ID);
}
})
});
fetch_single.php
include('db.php');
include('function.php');
if(isset($_POST["user_ID"]))
{
$output = array();
$statement = $conn->prepare(
"SELECT * FROM `user_accounts`
WHERE user_ID = '".$_POST["user_ID"]."'
LIMIT 1"
);
$statement->execute();
$result = $statement->fetchAll();
foreach($result as $row)
{
$output["level_ID"] = $row["level_ID"];
$output["user_Name"] = $row["user_Name"];
$output["user_Pass"] = decryptIt($row["user_Pass"]);
$output["user_Email"] = $row["user_Email"];
$output["user_status"] = $row["user_status"];
}
echo json_encode($output);
}
or it's might be the cause of problem is the design template?

Answer 1

i solve this issue, in my requested php file i change my $_POST to $_REQUEST if your data in ajax look like
data:{user_ID:user_ID}
or
data: "fname="+fname+"&lname="+lname
this might work for you, then if your data look like this data:new FormData(this) maybe you should use this type
data:{user_ID:user_ID}
to work the request and execute your sql.
but the best solution i got is change your
method:"POST"
to
type:"POST"
to solve this problem.
if your data.success_variable is undefined add
header('Content-type: application/json.');
to your requested php file.
Related topic:
ppumkin5 answer to
JQuery Ajax is sending GET instead of POST