What are common issues with using a submit button in a popup window in PHP?

Common issues with using a submit button in a popup window in PHP include the popup window closing before the form is submitted, leading to data loss. To solve this issue, you can use JavaScript to prevent the popup window from closing until the form is successfully submitted. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data here
    
    echo "<script>window.onbeforeunload = null; window.close();</script>";
}
?>

<!DOCTYPE html>
<html>
<head>
    <title>Popup Form</title>
</head>
<body>
    <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
        <!-- Form fields go here -->
        <input type="submit" value="Submit">
    </form>
    
    <script>
        window.onbeforeunload = function() {
            return "Are you sure you want to leave this page?";
        };
    </script>
</body>
</html>

Keywords

submit button popup window PHP form submission JavaScript

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