PHP Session ID Variable Returned With AJAX - php

Question

I'm working on an AJAX login system and am not sure how to return the PHP session variable from AJAX unto the login page. My question is, how do I return the php variable unto the login page, if that is even possible. Below is the sample I created.
Login Page
<?php
session_start();
?>
<form>
<input type="text" id="username" />
<input type="text" id="password"/>
<input type="button" id="submit" />
</form>
<script type="text/javascript" >
$('#submit').click(function() {
var username = $('#username').val();
var password = $('#password').val();
$.post('ajax_file.php',
{
username: username,
password:password,
},
function (data) {
/* what do I do here that will return the php variable
$_SESSION['user_id'] and let the user be logged in when
they go to homepage.php*/
setTimeout('window.location.href="homepage.php"', 2000);
});});
</script>
Here is the ajax page. I understand that the logic doesn't make sense for the session variable to pop out of nowhere, let's just assume that is was created earlier in the page.
$username = $_POST['username'];
$password = $_POST['password'];
if(login($username, $password)) {
return $session_user_id = $_SESSION['user_id'];
}

Answer 1

You can just do the AJAX post, set the session variable to the session in the page receiving the post, and it will be stored in the session (it's the same session). In the AJAX callback forward the user to the home page.
Of course you must consider the scenario that the login credentials are incorrect.

Answer 2

The trick is that your JavaScript doesn't even have to know about sessions at all; you can configure PHP to use HttpOnly cookies for its session management via the respective ini setting.
I would implement the AJAX script like this:
session_start(); // start the session
if (login($username, $password)) {
// alter session to hold user id
$_SESSION'user_id'] = $user_id_from_database_or_something;
return true;
} else {
return false;
}
The AJAX complete handler looks at the return value and redirect to the homepage if it was true. Something like below (I'm assuming that the PHP return is translated into something like echo json_encode($return_value):
if (data) {
// do redirect
} else {
// login failed
}
Then, when the user comes to the homepage their browser would send a session cookie so you can determine if they're logged in.

Answer 3

Improving the Answer
FOr Jquery, USe function below
function sendAjax(showAllExist, controller)
{
$.ajax({
type: "post",
url: login.php,
data: yourformdatacomeshere,
beforeSend: function() {
//do whatever you want to do before request
},
error: function() {
//display in case of error
},
success: function(data) {
//display in case of error
if(data!=""){
//redirect use to home pahe
window.location.href ='homepage.php';
}else{
//display login is not correct
}
},
complete: function() {
//hide any event which you have started on beforeSend
}
});
return true;
}

Answer 4

Cant you just do this:
$.post('ajax_file.php',
{
username: username,
password:password,
loginSession: <?php echo $_SESSION['user_id']; ?>
},
function (data) {
//Check here if login is correct.
if correct, create this variable:
var logged= "?logged="+data.SessionID;
/* what do I do here that will return the php variable
$_SESSION['user_id'] and let the user be logged in when
they go to homepage.php*/
setTimeout('window.location.href="homepage.php"+logged+"'", 2000);
});})
When data comes back go the homepage.php with a sessionID.
on the php script do this:
if(isset($_GET['logged'])){
start_session();
$_Session['LOGGED']='true';
}

Answer 5

use this method which is improvised above shail answer.
your ajax file code
$username = $_POST['username'];
$password = $_POST['password'];
if(login($username, $password)) {
$session_user_id = $_SESSION['user_id'];// this is from your code
$responseArray = array("message"=>"success","sessionId"=>$session_user_id);
}
else
{
$session_user_id = "";
$responseArray = array("message"=>"error","sessionId"=>$session_user_id);
}
echo json_encode ( $responseArray );
die ();
then in ajax function make below changes.
var frmdata = jQuery("#logindata").serialize(); // which contains the data of username and password
jQuery.ajax({
type : "POST"
,url :'ajax_file.php'
,data :frmdata
,dataType: "json"
,success : function(data){
if(data.message == "success")
{
//redirect it to your desire page
}
else
{
//redirect it to your login page
}
}
,beforeSend: function(html){
// some loader goes here while ajax is processing.
}
});
hope this help feel free to ask anything for this answer.