Clash Royale CLAN TAG#URR8PPP

XML Parsing Error - XmlHttpObj is null

Since moving to a https server and updating code, I'm having problems with cascading dropdown boxes that were previously working.

I get an XML Parsing Error: no element found, as well as an error telling me that XmlHttpObj.responseXML is null.

I have had some errors relating to updating the mysqli sections, and from what I have been able to work out I think the problem might be with the query. However, this is the same query that I have been using, and which has been working fine. So, I'm really not sure what is wrong here.

Ajax function causing error:

function StateChangeHandler()
// state ==4 indicates receiving response data from server is completed
if(XmlHttpObj.readyState == 4 && XmlHttpObj.status == 200)
populateCbo(XmlHttpObj.responseXML.documentElement);




XML page which is returning the null value:

<?php
// simple data provider for a cascading dropdown

Header("Content-type: text/xml");
include("db_setup.php");
session_start();
$db = $_SESSION['db_id'];
$con = mysqli_connect( C_DB_HOST, C_DB_NAME, C_DB_PASSWORD, $db );// Opens database

// get query string params

$parent = $_GET['parent'];
$level = $_GET['level'];

//Create query of other level records
$qry = "SELECT field1, field2 FROM table WHERE field3 = '".$parent."' and field4 = '".$level."'";

$result = mysqli_query($con, $qry);
mysqli_free_result($result);

// build xml content for JavaScript interpreter
$xml = "<mxml>";
$xml = $xml . '<parent_level name="0">';
$xml = $xml . '<child_level id="0"> </child_level>';
$xml = $xml . '</parent_level>';
while($row = mysqli_fetch_array($result))
$id = $row['field1'];

$value1= $row['field2'];
$value = str_replace("&", "&", $value1);

$xml = $xml . '<parent_level name="'.$parent.'">';
$xml = $xml . '<child_level id="'.$id.'">'.$value.'</child_level>';
$xml = $xml . '</parent_level>';


if (!$result)
printf("Error: %sn", mysqli_error($con)); //THIS IS NOT PRINTING ANY ERRORS
exit();


$xml = $xml . "</mxml>";
// send xml to client
echo( $xml );
?>


$valueA

session_start()

header()

htmlspecialchars()

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