I have got some error ajax - php

Question

I have an error where I can't proceed my login_process.php using ajax. I have stored all my files as a one folder. If I run my HTML log in page, the error is appeared. Below is my code. It is just a simple code. Before this, I have applied the similar code as below (except for login_process.php because I've put a few functions) as my homework. But when I've try to make it again, as i said, the browser, either in Chrome or Firefox, displays an error as I wrote in ajax below.
index.html(ajax part)
$(document).ready(function(){
$("#subBTN").click(function(){
var username = $("#username").val();
var password = $("#password").val();
var status = $("#statusAlert");
if(username === "" && password === ""){
status.html("<span>Username and password are both required!</span>");
}
else if(username === ""){
status.html("<span>What is your username?</span>");
}
else if(password === ""){
status.html("<span>What is your password?</span>");
}
else{
$.ajax({
url:'login_process.php',
type: 'post',
data: {"?admin_name=": username, "&admin_pass=": password},
dataType: 'html',
success: function(data){
//alert(data);
if(data.success){
status.html("<span>"+ data +"</span>");
}
else{
status.html("<span>error</span>");
return false;
}
}
});
}
});
});
login_process.php
<?php
session_start();
if($_POST):
$username = $_POST["username"];
$password = $_POST["password"];
if($username):
echo "Hi " . $username;
endif;
endif;
?>

Answer 1

You got a error in jQuery ajax call in passing data
You use :
data: {'admin_name':username, 'admin_pass': password},
instead of
data: {"?admin_name=": username, "&admin_pass=": password},
Or access in php code data to use:
$_POST['admin_name'] AND S_POST['admin_pass']

Answer 2

You should change this line of code
if(data.success){
status.html("<span>"+ data +"</span>");
}
else{
status.html("<span>error</span>");
return false;
}
To
if(data.Length > 0){
status.html("<span>"+ data +"</span>");
}
else{
status.html("<span>error</span>");
return false;
}