In this case for an internal non-public form that includes select lookup rules, I want to capture the logged in user, current location, and the select field value they use to lookup information so that I have a recent history record.

We can use this data for quick menu items of recently viewed accounts and instant alerts on unusual locations.

I suppose the form is a little less common as sometimes it is just used to lookup data and the submit button is only used when a process needs to be started.

I am on the classic designer on this one, but this is a useful function for the LFForm object that does the same thing. Was just looking for a checkbox on the rule next to the input field saying this field must have a value.

Hu that is a neat implementation. It isn't common to have "usage tracking" like that in a form, but for your case that does make sense.

We will not be touching lookup rules in classic forms so you'll be stuck with current behavior there. You might still be able to cancel the lookup event like I noted for the LFForm event, but with the actual DOM event in classic. I haven't played with that in a while though.

Like I said earlier we do want to enable this type of interactions in the form designer so I've noted your feedback!

I was surprised to find that even Autofill does not do what I thought. The rule still runs automatically when the user visits the form 1 time, just not continuously. But I thought enabling autofill would wait for the user to click the button before the rule runs. Every time I visit the form I get another blank row in the table.

That may be a bug, I can reproduce it in classic but not the form designer. I'll see if the team has bandwidth to fix it, but it would be a low priority.

Does the scripting approach work at all?

My script works in the sense that it presses the autofill button when the data is populated and/or changed but it can not stop the initial execution that runs when the form loads which inserts a blank row. I guess I need to call another delete function that deletes blank rows at the same time with a new rule.