I have an example in my new post form on my site here
<http://ooktech.com/jed/externalbrain/#New%20Blog%20Post>.
You use reveal widgets. It comes up a lot in forms in what I make. The
general form is like this:
<$edit-text tiddler='$:/temp/Some Tiddler' field='some_field'
class='tc-edit-texteditor'/>
<$reveal type=match state='$:/temp/Some Tiddler!!some_field' text=''>
Enter a name first
</$reveal>
<$reveal type=nomatch state='$:/temp/Some Tiddler!!some_field' text=''>
<$list filter='[{$:/temp/Some Tiddler!!some_field}!has[title]]'
emptyMessage='Already Exists'>
<<addButtonHere>>
</$list>
</$reveal>
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