How can JavaScript be effectively integrated with PHP to dynamically change frame content upon successful login?

To dynamically change frame content upon successful login, you can use JavaScript to manipulate the DOM based on the login status returned by PHP. You can have PHP set a session variable upon successful login and then use JavaScript to check this variable and update the frame content accordingly. 

<?php
session_start();

// Check login credentials
if ($valid_login) {
    $_SESSION['logged_in'] = true;
} else {
    $_SESSION['logged_in'] = false;
}
?>

<!DOCTYPE html>
<html>
<head>
    <title>Login Page</title>
</head>
<body>
    <div id="frameContent">
        <?php
        if ($_SESSION['logged_in']) {
            echo "<h1>Welcome, User!</h1>";
        } else {
            echo "<h1>Please log in to view content.</h1>";
        }
        ?>
    </div>

    <script>
        // Check if user is logged in and update frame content
        if (<?php echo json_encode($_SESSION['logged_in']); ?>) {
            document.getElementById('frameContent').innerHTML = "<h1>Welcome, User!</h1>";
        } else {
            document.getElementById('frameContent').innerHTML = "<h1>Please log in to view content.</h1>";
        }
    </script>
</body>
</html>

Keywords

JavaScript PHP integration dynamic content login frame

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