[StackOverflow/reactjs] React form with <Popup> alert message instead of alert()

### ROOT CAUSE The issue arises because the React form implementation uses a custom `Popup` component for displaying alert messages instead of the native `alert()` function. This likely stems from a design choice to provide more user-friendly or customizable notifications, but it could be causing confusion or unexpected behavior if the form expects the traditional `alert()` functionality. ### CODE FIX To resolve this, replace the `Popup` component with the native `alert()` function for displaying critical messages. Here's the fix: ```jsx // Replace this: const Popup = ({ message }) => ( ); // With this: const showMessage = (message) => { alert(message); // Use native alert for critical messages }; // Example usage in the form: if (error) { showMessage(error); // Trigger alert instead of Popup } ``` **Explanation:** The `alert()` function is built into browsers and ensures consistent behavior across devices. If the `Popup` component is intended for non-critical messages, keep it but clearly document its purpose. For critical errors or user actions, use `alert()` to maintain expected user feedback.