jQuery IFrame AJAX DEMO

Send files via iframe

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Send form via iframe

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Response handling

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Show action2.php source

$isError = !empty($_POST['error']);
$content = json_encode($isError ? ['error' => 'error message'] : ['status' => 'ok']);
if (!empty($_POST['X-Requested-With']) && $_POST['X-Requested-With'] === 'IFrame') {
    if ($isError) {
        echo '<textarea data-status="400" data-status-text="Bad Request" data-content-type="text/json">' . $content . '</textarea>';
    } else {
        echo '<textarea data-status="200" data-content-type="text/json">' . $content . '</textarea>';
    }
} else {
    if ($isError) {
        header("HTTP/1.1 400 Bad Request");
    }
    header('Content-Type: text/json');
    echo $content;
}