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://

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