How do I perform a simple ajax post

Hello, I've managed to make the Get with ajax to work, now i'm trying to Post some data and I'm getting errors.

Here is how my php file looks like:

header("Access-Control-Allow-Origin: *");

$user = "root";
$pass = "";

$dbh = new PDO('mysql:host=localhost;dbname=dbname', $user, $pass);

$Login = $_POST['L'];
$PW = $_POST['S'];
$datum = '{"c2array":true,"size":[3,10,1],"data":[[[0],[0],[0],[0],[0],[0],[0],[0],[0],[0]],[["Fatso"],[1000],[100],[900],[10],[10],[39],[10],[10],[0]],[[0],[0],[0],[0],[0],[0],[0],[0],[0],[0]]]}';

$sql = $dbh->query("UPDATE registration SET data = '$datum' WHERE uemail = '$Login' AND upassword = '$PW'");[/code:dpqxiom2]

Here is my construct 2 post request:
[img="http://s33.postimg.org/7txzoq9gv/image.png"]

At the debugger i'm getting:
[code:dpqxiom2]Undefined index: L[/code:dpqxiom2]

It seems like what you're trying to do is sending data twice (two datas – first in URL field and another time in Data field).

Try to do like this:

URL: "http://localhost/legacy/save.php"

Data: "L=" & UserLogin & "&S=" & UserPass

I'm not sure what's the savestats.Text inside the Data field.

It seems like what you're trying to do is sending data twice (two datas – first in URL field and another time in Data field).

Try to do like this:

URL: "http://localhost/legacy/save.php"

Data: "L=" & UserLogin & "&S=" & UserPass"

I'm not sure what's the savestats.Text inside the Data field.

Thanks for reply, savestats.Text contains json string that must be inserted into the database.

In other words, the place with $datum, must be provided with the string from savestats.Text

Then, I guess, you should add another parameter to the php and to c2

Example: if you add a parameter $string to php, make Data in c2 to: "L=" & UserLogin & "&S=" & UserPass & "&string=" & savestats.Text

Then, I guess, you should add another parameter to the php and to c2

Example: if you add a parameter $string to php, make Data in c2 to: "L=" & UserLogin & "&S=" & UserPass & "&string=" & savestats.Text

Thanks a lot! That kept me occupied for several hours.

Here is how I solved it:

Undefined index: has been resolved using isset:

if(isset($_POST['L'])){
    $Login = $_POST['L'];

}else {
    $Login = null;

}

if(isset($_POST['S'])){
    $PW = $_POST['S'];

}else {
    $PW = null;

}

if(isset($_POST['D'])){
    $datum = $_POST['D'];

}else {
    $datum = null;

}
[/code:1s003siu]

and at construct 2 post I've used the following path on the basis of your suggestion:
[code:1s003siu]"L=" & UserLogin & "&S=" & UserPass & "&D=" & savestats.Text[/code:1s003siu]

Working like a charm!