user-populated addition to string

[netniks]

I apologize for logging an "issue" when I really have a request.

http://userpages.bright.net/~toddw/filenames/

This link shows my application utilizing zeroclipboard. It initially worked for me, albeit several browser versions ago (Safari on macOS). Would you have a suggestion or recommendation for how I could pick up a user-generated input and copy that to the clipboard, as well as the rest of the predetermined drop-down menus? As you tell, my programming skills are pretty minimal.