How to use an Error Message tool with a Map interface tool

[TraceyD]

Hi, All -

I'd like to use an Error Message tool to make sure the user chooses a store from a Map interface tool, but I'm not sure what to put in the expression to check whether a selection was made.  (isEmpty and isNull don't work...)

Thanks for any assistance!

[Maskell_Rascal · Accepted solution]

Hi @TraceyD 

Instead of using the Interface Error Message tool, I would recommend using a Count Records and Message tool to throw the error when nothing is selected. 

Add the Count Records tool right after the Map Input tool, and then connect the Message tool to it configured as follows:

Now when nothing is selected, this message will pop up:

If this solves your issue please mark the answer as correct, if not let me know!

Thanks!

Phil