Event handler called when the form is submitted. preventDefault() is called on the native submit event when used.

Determines when the form should be validated. The validationMode prop on <Field.Root> takes precedence over this.

• onSubmit (default): validates the field when the form is submitted, afterwards fields will re-validate on change.
• onBlur: validates a field when it loses focus.
• onChange: validates the field on every change to its value.