While creating PHP login script using Javascript Ajax, Why I ain't getting response?

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create php login script using javascript ajax ?
i have this script for php login and i need to use ajax to login the users
but i can not make it work i can't get response form processing page
and i use alert function to alert response text but it's showing to me all my html code in alert
so how can i fix it

my code is seberated into two pages
1- login.php
2- login_processing.php

login.php

<?php
require_once ("../core/initialize.php");
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<meta charset="utf-8">
		<meta name="viewport"  http-equiv="Content-Type" content="width=device-width, initial-scale=1">
		<link rel="stylesheet" type="text/css" href="../style/normalize.css" />
		<link rel="stylesheet" type="text/css" href="../style/form.css" />
		<link rel="stylesheet" href="../style/Bootstrap-RT/css/bootstrap.rtl.css" type="text/css" />
		<link rel="stylesheet" href="../style/Bootstrap-RTL/css/bootstrap.rtl.full.css" type="text/css" />

		<title>  |  </title>

	</head>

	<body>

		<div class="container">

		<div class="login-form">
			<div>
				<?php if(isset($message)): ?>
				<div class="text-center text-danger" id="error-message" >
					<label><?php echo $message; ?></label>
				</div>
				<?php endif; ?>
			</div>

				<form method="post" id="login-form" name="login-form"   role="login-form">



								<div class="form-group">
									<div class="control-label">
										<label for="username"> </label>
									</div>
									<div>
										<input type="text" name="user_name" id="user_name" value=""  class="form-control" placeholder=" "  />
									</div>

								</div>

								<div class="form-group">
									<div class="control-label">
										<label for="password"> </label>
									</div>

									<div>
										<input type="password" name="password" id="password" value=""  class="form-control" placeholder=" "  />
									</div>

								</div>

								<div class="form-group">

									<div class="form-group">

										<button type="submit" name="login-button" id="login-button" class="btn btn-lg btn-default btn-block"  >
												    
										</button>

									</div>

									<div class="form-group">

										<label>
											   
											 <a href="send_email"></a>   
										</label>

									</div>

									<div class="form-group">

										<label>
											   
											 <a href="signup"></a>  
										</label>

									</div>

								</div>




				</form>

			</div>

		</div><!---------container---------->

		<script type="text/javascript" src="../js/ajax.js"></script>
		<script type="text/javascript" src="../js/functions.js"></script>
		<script type="text/javascript" src="../js/jquery-3.1.1.js"></script>

		<script type="text/javascript">
	
	function examineeLogin() {

		var user_name = document.getElementById("user_name").value;
		var password = document.getElementById("password").value;
		var error_message = document.getElementById("error-message");

		var input_parameters = "user_name=" + user_name + "&password=" + password;

		var xmlhttp = new XMLHttpRequest();
		xmlhttp.open("POST", "login_processing.php", true);
		xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		xmlhttp.onreadystatechange = function() {

			if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {

				if (xmlhttp.responseText == "         ") {
					//document.getElementById("error-message").innerHTML = "          ";
					
					alert(xmlhttp.responseText);
					
				} else {

					//console.log(xmlhttp.responseText);
					window.location.href = "../examinee/examinee_profile.php";
					//setTimeout(' window.location.href = "../pages/main_page.php"; ',4000);

				}

			}

		};

		xmlhttp.send(input_parameters);

	}

	var form_submti = document.getElementById("login-form");
	form_submti.addEventListener("submit", examineeLogin);
		</script>
	</body>
</html>

login_processing.php

<?php require_once ("../core/initialize.php"); ?>
<?php
$form_errors = array();
$is_valid = true ;
$output = null;
if (isset($_POST["user_name"]) && isset($_POST["password"])) {


	$user_name  = trim(Functions::POST("user_name")) ;
	$password   = trim(Functions::POST("password")) ;
	
    $required_fields = array(
        " " => $user_name,
        " " => $password
    );


Validation::check_empty_fields($required_fields);

 if(!empty(Validation::form_errors($form_errors))){

     $session->message(Validation::form_errors($form_errors));
     Functions::redirect_to("login.php");
     $is_valid = false ;
 }
 
 if($is_valid == true){
	 
	 if(Examinee::examinee_login($user_name, $password) === true ){
    
   Functions::redirect_to("../examinee/examinee_profile.php");
    
}else{
    
    $session->message("         ");
    Functions::redirect_to("login.php");

}
	 
 }


}// End of submit
?>

While creating PHP login script using Javascript Ajax, Why I ain't getting response?

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