I have built a simple responsive form. I have created some mandatory fields in the list itself, or on the rule using the rules, and the question applies to both.
I know I can disable the Save button unless all the mandatory fields are filled.
Ideally, I would like to have a message appearing, after clicking on the Save button to indicate if some mandatory fields are missing, and ideally which ones. Because the Save button does not work, and the user has no idea why.
Does somebody know how to achieve that?
Maybe I am missing something in your question, but the form automatically gives a message to the user when data is missing in required fields:
If you don't like the default message, you can enter a custom message, for example: