PHP javascript表单验证未通过而表单依然提交
如题，我的情况是不输入任何数据，点击提交注册，会弹出“请输入用户名”这样的提示，点击确定后 就转到另一个页面，并只显示一句话：Column 'UserName' cannot be null。
下面是代码：
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php require_once('Connections/conetion.php'); ?><?phpfunction GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") { $theValue = (!get_magic_quotes_gpc()) ? addslashes($theValue) : $theValue; switch ($theType) { case "text": $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL"; break; case "long": case "int": $theValue = ($theValue != "") ? intval($theValue) : "NULL"; break; case "double": $theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL"; break; case "date": $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL"; break; case "defined": $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue; break; } return $theValue;}$editFormAction = $_SERVER['PHP_SELF'];if (isset($_SERVER['QUERY_STRING'])) { $editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);}if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "form1")) { $insertSQL = sprintf("INSERT INTO member (UserName, Password, Email) VALUES (%s, %s, %s)", GetSQLValueString($_POST['UserName'], "text"), GetSQLValueString($_POST['Password'], "text"), GetSQLValueString($_POST['Email'], "text")); mysql_select_db($database_conetion, $conetion); $Result1 = mysql_query($insertSQL, $conetion) or die(mysql_error()); $insertGoTo = "index.php"; if (isset($_SERVER['QUERY_STRING'])) { $insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?"; $insertGoTo .= $_SERVER['QUERY_STRING']; } header(sprintf("Location: %s", $insertGoTo));}?><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title></title>
