NoahUi is designed for modern single-page applications, hence using DOM form actions is not supported by default. To achieve native form submission, you can send your data using FormData.
When using n-form you should bind a handler to the submit event and return a promise. Before your handler is called, form fields will be validated.
Validation rules can be passed to a component that implements Input mixin via rules prop.
Rules are an array of validations that should be run on a field's. You can use either build-in validations or write your own. Custom validators should throw an error to indicate validation failure (you can optionally return false or a string with an error, but throwing an error is preferred). Custom validators can return promises.