Формы и валидация

Когда использовать

Build forms that distinguish validation, network and server failures.

Решения для реализации

1. Validate syntax on the client for usability and all trust boundaries on the server.
2. Prevent duplicate submissions while pending; use idempotency for real mutations.
3. Preserve user input on failure and provide retry.
4. Focus the first invalid field and link error text through aria-describedby.

Как проверить результат

• Invalid data produces specific errors.
• Network failure never appears as success.
• Slow requests do not duplicate submissions.

Работающий пример

Файлы