Check $ _SESSION ['logout'] value without refreshing the page

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Check $ _SESSION ['logout'] value without refreshing the page

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#1 by (0 votes)

1

I'm trying to redirect when $_SESSION['logout'] equals on . However, it only checks the value of $_SESSION['logout'] when updating the page.

I would like to know how to check the value of $_SESSION['logout'] every 5 seconds without reloading the page, and when its value is on it redirect.

if($_SESSION['logout'] == "on") {

  echo "<script type=\"text/javascript\">
  window.location = 'login.php';
  </script>";

}

php javascript

asked by anonymous 04.01.2019 / 01:47

1 answer

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score 0 · Accepted Answer

" - I would like to know how to keep checking the value of $ _SESSION ['logout'] every 5 seconds without reloading the page, and when its value is on it redirect." p>

This can be done with ajax requests executed within a setInterval() function. See my example:

index.php:

<!DOCTYPE html>
<html>
    <head>
        <title>Verificar valor de $_SESSION['logout'] por LipESprY</title>

        <script type="text/javascript" src="https://code.jquery.com/jquery-3.3.1.min.js"></script></head><body><p>Umapáginaqualquer...</p><scripttype="text/javascript">
            $(function(){
                setInterval(function(){
                    $.ajax({
                        url: 'logout_status.php',
                        method: 'get',
                        dataType: 'json'
                    })
                    .done(function(retorno){
                        if (retorno.logout == 'on')
                            window.location.href = 'login.php';
                    })
                    .fail(function(erro){
                        console.log('Ocorreu um erro ao checar o logout:');
                        console.log(erro);
                    });
                }, 5000);
            });
        </script>
    </body>
</html>

logout_status.php:

<?php
//session_start();
//$_SESSION['logout'] = 'on';
if (!empty($_SESSION['logout']))
    echo json_encode(
        array('logout' => $_SESSION['logout'])
    );
else
    echo json_encode(
        array('logout' => null)
    );

Example Considerations:

I'm using the jQuery 3.3.1 library
On the page that addresses the ajax request (logout_status.php) I left two commented lines to test the redirect. Tailor to your project ...
In the setInterval() fault function, I set the time set to 5 seconds / 5000 ms. If you want to change, just change this line: }, 5000); . Remember that the function waits for the time in microseconds (ms);
I've already left the redirect pointing to the file login.php ;
The file logout_status.php must be in the same directory as index.php (side-by-side);

You can download this project from my GitHub / LipESprY / sopt-check -value-of-sessionlogout-no-update-to-page .