Use case

The current values for AutoValidateMode all suffer from the fact that the user is presented an error message when he hasn't done anything wrong:

• on user interaction: if the user starts typing in a textfield that requires minimum 10 characters, displaying the error as soon as he types is questionable UX
• on unfocus: if the user refocus the field and correct his mistake, the error message is still shown, since there is no unfocus event.

Ultimately it's not possible to show an error message when the user is "done" because we don't know when that's the case. However we can approximate it with a delay.

Proposal

My proposal is to add AutoValidateMode.delayed, so that validation happens after a delay after the last user change.

Non Proposal

Custom validation mode / user defined validation modes.