JavaScript username checker.

[iRoot121]

Hi, I'm trying to let JavaScript check if a givin user exist in the database.

 

It seems that the _check-user.php always returns 0, but if I fill in a name that doesn't exist, and echo out the result variable in JS, the echo will return 1.

 

Is there someone who could help me?

 

JavaScript part:

function checkUser() {
	$.post("_check_user.php", { 'username': document.getElementById("username").value }, function(result) {
		if (result == 1) {
			document.getElementById("checkUser").className = "succes";
			document.getElementById("checkUser").innerHTML = "Name is available";
		}else{
			document.getElementById("checkUser").className = "errormsg";
			document.getElementById("checkUser").innerHTML = "Name is not available!";
		}
	});
}

_check-user.php:

<?php
include("config.php");

$result = mysql_query("SELECT login FROM users WHERE login='".clean_string($_POST["username"])."'");

if(mysql_num_rows($result)>0){
	echo 0;
}else{
	echo 1;
}

?>

[jazzman1]

Check first, what value you're sending to database. I'm pretty sureit's incorrect.

<?php

var_dump($_POST["username"]); exit; 

include("config.php");

Note: The original MySQL extension is now deprecated and it's not recommended to use for new development. Instead, use the MySQLi or PDO_MySQL extensions.