lucy24 - 12:16 am on May 5, 2013 (gmt 0)
If it isn't going to be indexed, you don't need to worry about cloaking. (Or duplicate content, which could likewise be an issue if the same text shows up lots of places.) I got the impression that was the primary question.
Does the user continue on the same page after clicking Submit? If so, it almost has to be some form of js. If you send them along to a different page, the possibilities open up.