# Legacy form live validation

`backend/static/js/components/liveValidationHandler.js` provides client-side
validation for server-rendered Django forms. It is not used as the authorization
or data-integrity boundary; Django forms and DRF serializers must repeat every
required validation rule.

```javascript
import { initLiveValidation } from './liveValidationHandler.js';

const validation = initLiveValidation({
  formSelector: '#registrationForm',
  debounce: 500,
  rules: {
    email: [
      { type: 'required', message: 'Email обязателен' },
      { type: 'email', message: 'Некорректный email' }
    ]
  }
});
```

Supported rule types are `required`, `email`, `pattern`, `minLength`,
`maxLength`, `match`, `anyContact` and a custom `validate` function. Options
control validation on input, blur and submit.

The returned object exposes `validateField`, `validateForm`, `clearValidation`
and `destroy`. Call `destroy` when replacing a form dynamically to avoid duplicate
listeners.

The module applies Bootstrap `is-valid`, `is-invalid` and `invalid-feedback`
classes. New Next.js forms should use their component-level validation and API
errors instead of importing this legacy browser module.