Cannot get Custom Select List "On Change" event to work with blank selection
I have a custom select list that is populated by a data master, and the first record in the data master is a blank, so the user has the option of not making a selection. I'm trying to connect an "on change" event to the select menu, but event conditions seem either unable to recognize the blank selection or, if they do, unable to successfully utilize text functions or evaluate the selection as a blank string.
Practical example: show a text box whenever the select list selection is the blank, hide the text box whenever the select list selection is not the blank. Starting out with the blank selected (default value) and the text box visible, the user makes a selection other than the blank and the text box disappears. Good. The user now changes the selection back to the blank, the text box does not reappear. Bad
I've tried every form of event condition I can think of (e.g. checking if the character count of the selection is 0, comparing the selection to a blank string, adding a space to the blank record in the data master but the data master ignores and removes it, checking for a substring that is common to all of the non-blank selections), but to no avail.
Any suggestions to get this to work?