Untitled

<!DOCTYPE html>
<html>
<head>
	<title>Test</title>
	<meta charset="UTF-8"/>
	<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
	<script>
	$(document).ready(function(){

		data = EingabeText.value;

		var request = new XMLHttpRequest();
		request.open('post', 'Mailer.php', true);
		request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		request.send('json='+data);

		request.onreadystatechange = function() {
			if (request.readyState==4 && request.status==200){
				alert(request.responseText);
			};
		};

	});
	</script>
</head>
<body>
	<form id="bla" method="post">
		<input type="text" id="EingabeText" value="Testwert 1"/>
		<input type="text" id="EingabeText2" value="Testwert 2"/>
	</form>
</body>
</html>