I have stored the ID of the user in session storage. I need to perform an action using the ID so I am passing it to the server using AJAX but the data is not reaching the server.

AJAX:-

$(document).ready(function(){
  $('#coupon_code').hide();
  $('#coupon_status').hide();
  var id = sessionStorage.getItem('user_id');

  $('#generate').click(function(){
    $.ajax({
      type : "POST",
      dataType : 'json',
      url : 'http://127.0.0.1/ionic/generate.php',
      data : id,
      beforeSend : function(){
        console.log(sessionStorage.getItem('user_id'));
        console.log("data sent");
      },
      success : function(data){
        console.log(data);
        console.log(data.code);
        console.log(data.value);
      }
    });
  });
});

PHP script:-

<?php
require 'db_connect.php';
header('Access-Control-Allow-Origin: *');
$id = $_POST['id'];

$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$string = '';

for ($i = 0; $i < 5; $i++) {
    $string .= $characters[mt_rand(0, strlen($characters) - 1)];
}
$ins = "INSERT INTO `coupon_code` (id,code,status) VALUES ('$id,'$string',1)";
$res_ins = mysqli_query($con,$ins);

if($res_ins)
{
    echo json_encode(array("status" => "done", "code" => $string,"value" => "1"));
    //echo $string;
}
else
{
    echo "NO";
}
?>

EDIT :- Firebug result

access通过adp项目链接服务器后，表格的子数据表无法使用

baidu_30376951

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