How to show input validation errors

[marcdexet-cnrs]

Hi folks,

I'm trying to build up a form for a textual application and there are some validation rules for each input. The question est pretty simple: what is the most used way to show nicely validation error message in this form ? Use a Static per input and update its value ? A toaster ?
I have searched into examples and videos and, expect RichLog, I didn't find the perfect and professional looking way to process.

Any good ideas are welcome.

Have a good day.

[willmcgugan]

I like to show error messages under the input. But honestly, it's up to you.