我有一个注册表单，我想从php中获取最后一个id，以便在window.location中使用java。我正在使用json_encode将值从php编码为javascript。在页面重定向之前，我可以看到带有最后一个id的回显json_encode，但是window.location中使用的id变量返回null。
真的很感激任何帮助。请原谅任何业余错误，因为我不是javascript（ajax专家）。
<?php
if(isset($_POST['n'])){
$user = new User();
$user->name = trim($_POST['n']);
$user->email = trim($_POST['e']);
$user->password = trim($_POST['p']);
$user->name_of_institution = trim($_POST['ni']);
$user->name_of_institution_db = strtolower(str_replace(" ", "_", (trim($_POST['ni']))));
$user->type_of_school = trim($_POST['st']);
$user->country = trim($_POST['c']);
$user->region = trim($_POST['r']);
$user->town = trim($_POST['t']);
$user->zip_code = trim($_POST['z']);
$user->postal_address = trim($_POST['pa']);
$user->street_address = trim($_POST['sa']);
$user->school_code = trim($_POST['sc']);
$user->waec_code = trim($_POST['wc']);
$user->doe = trim($_POST['d']);
$user->registration_date = strftime("%Y-%m-%d %H:%M:%S", time());
$user->uid = crypt(uniqid(rand(),1));
//ERROR HANDLING
if($user->name == "" || $user->email == "" || $user->password == "" || $user->name_of_institution == "" || $user->type_of_school == "" || $user->country == "" || $user->region == "" || $user->town == "" || $user->zip_code == "" || $user->postal_address == "" || $user->street_address == ""|| $user->school_code == "" || $user->waec_code == "" || $user->doe == "" ){
echo "The submission form is missing some values. Kindly complete the form and try again";
exit();
} else {
if($user->save() && $user->create_school_table() && $user->create_comment_table() && $user->create_course_table() && $user->create_teacher_table() && $user->create_score_table() && $user->create_status_table() && $user->create_message_table() && $user->create_reply_table() && $user->create_level_table() && $user->insert_subjects_into_course_table() && $user->insert_levels_into_level_table() && $user->create_timeline_table()) {
//coment saved
//No message needed; seeing the comment again is proof enough
//Important! You could jsut let the page render from here
//But then if the page is reloaded, the form will try
//to resubmit the comment. So redirect instead:
if (!file_exists(SITE_ROOT .DS. 'public_html' .DS. 'images' .DS. $user->id)) {
mkdir (SITE_ROOT .DS. 'public_html' .DS. 'images' .DS. $user->id, 0777);
}
echo "Signup_Success";
$ide = $user->id;
$id = utf8_encode($ide);
echo json_encode($id);
//echo $id;
exit();
//$session->message("Successful Registration.");
//redirect_to("logo_upload.php?id={$user->id}&name_of_institution={$user->name_of_institution}");
}
}
}
?>
<script>
function restrict(elem){
var tf = _(elem);
var rx = new RegExp;
if(elem == "email"){
rx = /[' "]/gi;
} else if(elem == "username"){
rx = /[^a-z0-9]/gi;
} else if(elem == "school_code"){
rx = /[^0-9]/gi;
}
tf.value = tf.value.replace(rx, "");
}
function emptyElement(x){
_(x).innerHTML = "";
}
function checkusername(){
var n = _("name").value;
if(n != ""){
_("usernamestatus").innerHTML = 'Checking...';
var ajax = ajaxObj("POST", "ajax_form_check.php", true);
ajax.onreadystatechange = function() {
if(ajaxReturn(ajax) == true) {
_("usernamestatus").innerHTML = ajax.responseText;
}
}
ajax.send("name2check="+n);
}
}
function matchpassword(){
var p1 = _("password").value;
var p2 = _("rpassword").value;
if((p1 != p2) || (p2 != p1)){
_("passwordstatus").innerHTML = '<p class=\"btn btn-danger text-center col-sm-6 col-sm-offset-3\">Confirmation failed. Please recheck.</p>';
}else {
_("passwordstatus").innerHTML = '';
}
}
function signup(){
var n = _("name").value;
var e = _("email").value;
var p1 = _("password").value;
var p2 = _("rpassword").value;
var ni = _("name_of_institution").value;
var st = _("type_of_school").value;
var c = _("country").value;
var r = _("region").value;
var t = _("town").value;
var z = _("zip_code").value;
var pa = _("postal_address").value;
var sa = _("street_address").value;
var sc = _("school_code").value;
var wc = _("waec_code").value;
var d = _("doe").value;
var status = _("status");
if(n == "" || e == "" || p1 == "" || p2 == "" || ni == "" || st == "" || c == "" || r == "" || t == "" || z == "" || pa == "" || sa == ""|| sc == "" || wc == "" || d == ""){
window.scrollTo(0,0);
status.innerHTML = "<p class=\"btn btn-danger text-center col-sm-6 col-sm-offset-3\">Please complete the form. There seems to be some empty spaces. Thank you.</p><br>";
} else if(p1 != p2){
window.scrollTo(0,0);
status.innerHTML = "<p class=\"btn btn-danger text-center col-sm-6 col-sm-offset-3\">Your password fields do not match</p><br>";
//} else if( _("terms").style.display == "none"){
//status.innerHTML = "Please view the terms of use";
} else {
_("signupbtn").style.display = "none";
status.innerHTML = 'Please wait ...';
var ajax = ajaxObj("POST", "regform.php");
ajax.onreadystatechange = function() {
if(ajaxReturn(ajax) == true) {
//var id = <?php echo json_encode($id); ?>;
if(ajax.responseText == "Signup_Success"){
status.innerHTML = ajax.responseText;
_("signupbtn").style.display = "block";
} else {
//var id = <?php echo json_encode($id); ?>;
var id = JSON.parse( '<?php echo json_encode($id); ?>' );
window.location ="logo_upload.php?id="+id+"&name_of_institution="+ni;
}
}
}
ajax.send("n="+n+"&e="+e+"&p="+p1+"&ni="+ni+"&st="+st+"&c="+c+"&r="+r+"&t="+t+"&z="+z+"&pa="+pa+"&sa="+sa+"&sc="+sc+"&wc="+wc+"&d="+d);
}
}
</script>
php和ajax代码都在同一页面regform.php上。分离代码会有帮助吗？