What are the limitations of using JavaScript to track user activity and online status on a website, especially in terms of detecting when a user leaves a domain?

One limitation of using JavaScript to track user activity and online status on a website is that it cannot reliably detect when a user leaves a domain, as the browser may not always send a request to the server when a user navigates away. To overcome this limitation, you can use a combination of JavaScript and server-side technologies like PHP to track user activity and online status more accurately. 

<?php
// Server-side code to track user activity and online status
session_start();

// Update user's last activity timestamp
$_SESSION['last_activity'] = time();

// Check if user is still online
if (isset($_SESSION['last_activity']) && (time() - $_SESSION['last_activity'] > 300)) {
    // User has been inactive for more than 5 minutes, consider them offline
    // Perform actions like updating user status in database
}
?>

Keywords

JavaScript user activity tracking online status domain detection limitations

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