How do I highlight an invalid form field via custom logic in the onchange method?

Question

I am trying to validate a phone field using a custom python library that checks if a given phone number is valid or not. If it is invalid I would like to show the field in red, somewhat like how we see mandatory fields highlighted after we click submit without filling them in. How do I trigger this highlighting of the field?

Haresh Kansara · Answer

Hi Ragav,
if your main goal is to validate field before saving record and raise validation error then you cam put your login into @api.constrains to achieve this.
When user click on save button then @api.constrains will execute and if number not on correct format then raise error.
But if you really want to make field as red like mandatory then you need to do the JS stuff to validate number and and make field border red using JS calculation.
There is an already module to validate number:
https://

Publicaciones relacionadas	Respuestas	Vistas
Error while trying to open a form in my module Resuelto error form	2 ene 21	3676
Form view fields validation Resuelto form validation input	1 nov 23	2710
statusbar does not highlight. [Closed] Resuelto form statusbar highlight	4 ago 15	7247
Error while adding grid to a form. error form gridview	0 mar 15	4178
form view server error server error form view	3 mar 15	4580

Se marcó esta pregunta

¿Le interesa esta conversación? ¡Participe en ella!