我正在拼命尝试使这个代码工作，只要我点击S表格刷新并且没有任何反应。 usernamecheck func工作得很好。
html和php，这个文件名是：sign_up_page.php -
<?php
session_start();
// If user is logged in, header them away
if(isset($_SESSION["username"])){
header("location: message.php?msg=NO to that weenis");
exit();
}
?><?php
// Ajax calls this NAME CHECK code to execute
if(isset($_POST["usernamecheck"])){
include_once("php_includes/db_conx.php");
$username = preg_replace('#[^a-z0-9]#i', '', $_POST['usernamecheck']);
$sql = "SELECT id FROM users WHERE username='$username' LIMIT 1";
$query = mysqli_query($db_conx, $sql);
$uname_check = mysqli_num_rows($query);
if (strlen($username) < 3 || strlen($username) > 16) {
echo '<strong style="color:#F00;">3 - 16 characters please</strong>';
exit();
}
if (is_numeric($username[0])) {
echo '<strong style="color:#F00;">Usernames must begin with a letter</strong>';
exit();
}
if ($uname_check < 1) {
echo '<strong style="color:#009900;">' . $username . ' is OK</strong>';
exit();
} else {
echo '<strong style="color:#F00;">' . $username . ' is taken</strong>';
exit();
}
}
?>
<?php
// Ajax calls this REGISTRATION code to execute
if(isset($_POST["username"])){
echo "entered !!!!!!";
// CONNECT TO THE DATABASE
include_once("php_includes/db_conx.php");
// GATHER THE POSTED DATA INTO LOCAL VARIABLES
$u = preg_replace('#[^a-z0-9]#i', '', $_POST['username']);
$fn = preg_replace('#[^a-z0-9]#i', '', $_POST['firstn']);
$ln = preg_replace('#[^a-z0-9]#i', '', $_POST['lastn']);
$e = mysqli_real_escape_string($db_conx, $_POST['email']);
$p = $_POST['pass1'];
// GET USER IP ADDRESS
$ip = preg_replace('#[^0-9.]#', '', getenv('REMOTE_ADDR'));
// DUPLICATE DATA CHECKS FOR USERNAME AND EMAIL
$sql = "SELECT id FROM users WHERE username='$u' LIMIT 1";
$query = mysqli_query($db_conx, $sql);
$u_check = mysqli_num_rows($query);
// -------------------------------------------
$sql = "SELECT id FROM users WHERE email='$e' LIMIT 1";
$query = mysqli_query($db_conx, $sql);
$e_check = mysqli_num_rows($query);
// FORM DATA ERROR HANDLING
if($u == "" || $e == "" || $p == "" || $ln == "" || $fn == ""){
echo "The form submission is missing values.";
exit();
} else if ($u_check > 0){
echo "The username you entered is alreay taken";
exit();
} else if ($e_check > 0){
echo "That email address is already in use in the system";
exit();
} else if (strlen($u) < 3 || strlen($u) > 16) {
echo "Username must be between 3 and 16 characters";
exit();
} else if (is_numeric($u[0])) {
echo 'Username cannot begin with a number';
exit();
} else {
// END FORM DATA ERROR HANDLING
// Begin Insertion of data into the database
// Hash the password and apply your own mysterious unique salt
$cryptpass = crypt($p);
include_once ("php_includes/randStrGen.php");
$p_hash = randStrGen(20)."$cryptpass".randStrGen(20);
// Add user info into the database table for the main site table
$sql = "INSERT INTO users (username, email, password, firstname, lastname, ip, signup, lastlogin, notescheck)
VALUES('$u','$e','$p_hash','$fn','$ln','$ip',now(),now(),now())";
$query = mysqli_query($db_conx, $sql);
$uid = mysqli_insert_id($db_conx);
// Establish their row in the useroptions table
$sql = "INSERT INTO useroptions (id, username, background) VALUES ('$uid','$u','original')";
$query = mysqli_query($db_conx, $sql);
echo "signup_success";
exit();
}
exit();
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Memory Line - Sign Up Page</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="../bootstrap/css/bootstrap.css">
<link rel="stylesheet" href="../bootstrap/css/bootstrap-responsive.css">
</head>
<body>
<script src="http://code.jquery.com/jquery-1.9.0.min.js"></script>
<script src="../bootstrap/js/bootstrap.js"></script>
<script src="js/sign_up_js.js"></script>
<script src="js/main.js"></script>
<script src="js/ajax.js"></script>
<div class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
<span class="icon-th-list"></span>
</a>
<a href="#" class="brand">Memory Line</a>
<div class="nav-collapse collapse">
<ul class="nav pull-right" >
<li class="active"><a href="#">Home</a></li>
<li class="divider-vertical"></li>
<li><a href="#">About Us</a></li>
<li class="divider-vertical"></li>
<li><a href="#">Contact</a></li>
</ul>
</div>
</div>
</div>
</div> <!--top navbar-->
<div class="row-fluid">
<div class="span4">
<div class="well well-large">
<form>
<fieldset>
<h2>Login!</h2>
<input type="text" class="input-block-level" placeholder="Username"> <!--username-->
<input type="text" class="input-block-level" placeholder="Password"> <!--password-->
<button id="sumbit_btn" class="btn btn-primary" type="submit" >Sumbit</button> <!--login btn-->
</fieldset>
</form>
</div>
</div> <!--login form-->
<div class="span8">
<div class="well well-large">
<h2>Sign Up!</h2>
<form >
<fieldset>
<div class="span6">
<input type="text" id="username" class="input-block-level" placeholder="Username" name="username" onkeyup="restrict('username')" onblur="checkusername()" maxlength="16" >
<input type="text" id="email" name="pass1" class="input-block-level" placeholder="Password" maxlength="16">
<input type="text" name="pass2" class="input-block-level" placeholder="Repeat Password" maxlength="16">
<input type="email" name="email" class="input-block-level" onkeyup="restrict('email')" placeholder="Email" maxlength="88">
<span id="status"></span>
</div>
<div class="span6">
<input type="text" name="firstn" class="input-block-level" placeholder="First Name" maxlength="16">
<input type="text" name="lastn" class="input-block-level" placeholder="Last Name" maxlength="16">
<div class="input-append date datepicker" data-date-format="dd-mm-yyyy">
<input type="date"><span class="add-on">Birth Day</span>
</div>
<button class="btn btn-primary span4 pull-right" onclick="signup()">submit</button>
</div>
</fieldset>
</form>
</div>
</div>
</div>
</body>
</html>
包含注册功能的javascript：
function restrict(elem){
var tf = _(elem);
var rx = new RegExp;
if(elem == "email"){
rx = /[' "]/gi;
} else if(elem == "username"){
rx = /[^a-z0-9]/gi;
}
tf.value = tf.value.replace(rx, "");
}
function emptyElement(x){
_(x).innerHTML = "";
}
function checkusername(){
var u = _("username").value;
if(u != ""){
_("status").innerHTML = 'checking ...';
var ajax = ajaxObj("POST", "sign_up_page.php");
ajax.onreadystatechange = function() {
if(ajaxReturn(ajax) == true) {
_("status").innerHTML = ajax.responseText;
}
}
ajax.send("usernamecheck="+u);
}
}
function signup(){
var username = _("username").value;
var e = _("email").value;
var p1 = _("pass1").value;
var p2 = _("pass2").value;
var fn = _("firstn").value;
var ln = _("lastn").value;
var status = _("status");
if(username == "" || e == "" || p1 == "" || p2 == "" || fn == "" || ln == ""){
status.innerHTML = "Fill out all of the form data";
} else if(p1 != p2){
status.innerHTML = "Your password fields do not match";
} else {
status.innerHTML = 'please wait ...';
var ajax = ajaxObj("POST", "sign_up_page.php");
ajax.onreadystatechange = function () {
if (ajaxReturn(ajax) == true) {
alert("ajax returned true");
if (ajax.responseText != "signup_success") {
status.innerHTML = ajax.responseText;
status.innerHTML = 'some problem has accourd';
} else {
window.scrollTo(0, 0);
status.innerHTML = "Succeed , check your Email Account for activation";
}
}
}
ajax.send("username="+username+"&e="+e+"&p="+p1+"&fn="+fn+"&ln="+ln);
}
}
/* function addEvents(){
_("elemID").addEventListener("click", func, false);
}
window.onload = addEvents; */
ajax.jx：
function ajaxObj( meth, url ) {
var x = new XMLHttpRequest();
x.open( meth, url, true );
x.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
return x;
}
function ajaxReturn(x){
if(x.readyState == 4 && x.status == 200){
return true;
}
}