How to avoid to add a row after submitting a form

[Darren_Murphy]

You are approaching this the wrong way.
You can’t prevent a row from being added when a form is submitted.

If you want to prevent duplicates, then the correct approach is to use a Custom Form. With that approach you can detect the duplicate before the form is submitted.

How do I create a custom form?

I’m just dropping this here so I have something to refer people to when they ask. This is a simple concept app (copyable), that demonstrates the following techniques: Building custom forms for adding and editing list items (as an alternative to the native forms provided by Glide) Preventing duplicate new entries using User Specific Columns and Relations Enforcing mandatory input items The use of visibility conditions and user specific booleans to control user flow There is nothing particula…