private static function validateForm()
{
$result = array('validated' => false, 'invalid' => array());
Form::validate($_POST);
if (!Form::isValid()) {
$result['invalid'] = Form::getInvalidFields();
} else {
$result['validated'] = true;
$result['fieldValues'] = Form::getValues();
unset($result['fieldValues']['dataTable']);
// remove sensitive data
self::sendmail();
}
//header('Content-Type: application/json'); // IE 8 treats it as a download
header('Content-Type: text/html');
echo json_encode($result);
}