<?php
	require_once 'header.php';

	echo <<<END
		<script>
			function checkUser(user){
				if(user.value==''){
					0('info').innerHtml =''
					return
				}
				params = "user" + user.value
				request = new ajaxRequest()
				request.open("POST","checkuser.php",true)
				request.setRequestHeader("Content-type","application/x-www-form-urlencoded")
				request.setRequestHeader("Content-length",params.length)
				request.setRequestHeader("Connection", "close")

				request.onlyreadystatechange = function()
				{
					if(this.readyState == 4)
						if(this.status == 200)
							if(this.request != null)
								0('info').innerHTML = this.responseText
				}
				request.send(params)


			}

			function ajaxRequest(){
				try {var request = new XMLHttpRequest()}
				catch(el){
					try{request = new ActiveXObject("Msxl2.XMLHTTP")}
					catch(e2){
						try {request = new ActiveXObject("Microsoft.XMLHTTP")}
						catch (e3){request = false}
					}
				}
			}
			return request
		}
		</script>
		<div class="main"><h3>Введите пожалуйста свои регистрационные данные</h3>
END;

	$error = $user = $pass ="";
	if (isset($_SESSION['user'])) destroySession();
	if(isset($_POST['user']))
	{
		$user = sanitizeString($_POST['user']);
		$pass = sanitizeString($_POST['pass']);
		if ($user == '' || $pass == '')
			$error = '<h4>Заполните все поля<br></h4>';
		else{
			$result = queryMysql("SELECT user FROM members WHERE user = '$user'");
			if ($result->num_rows > 0)
				$error = "<h4>Такое имя есть</h4><br>";
			else{
				queryMysql("INSERT INTO members (user,pass) VALUES('$user','$pass')");
				die("<h4>Аккаунт создан</h4><br>");
			}
		}




	}

	echo <<<_END
		<form action='signup.php' method='POST'> $error
		<span class='fieldname'>Username</span>
		<input type='text' maxlength='16' name='user' value = '$user' onBlur = 'checkUser(this)'><span id='info'></span><br>
		<span class='fieldname'>Password</span>
		<input type='text' name='pass' maxlength='16' value='$pass'><br>
_END;

?>
<span class="fieldname">&nbsp;</span>
<input type="submit" name="Sign up" />
</form></div><br>
</body>
</html>


checkuser.php
<?php
	require_once 'functions.php';

	if (isset($_POST['user'])) {
		$user = sanitizeString($_POST['user']);
		$result = queryMysql("SELECT * FROM members WHERE user = '$user'");
		if ($result->num_rows > 0) {
			echo "<span class='taken'>&nbsp;&#x2718;</span>". "<span>Имя занято</span>";

		}else echo "<span class='available'>&nbsp;&#x2714;"."Это имя доступно</span>";
	}