Where can I find list of control names like $user.email

[David Spaulding]

I am looking for a list of variables that can be dded to a Form Hidden field.

One class is $user, what are the others and what elements like $user.email can be referenced?

[Jobin Kuruvilla [Adaptavist]]

It comes from the Java API. For example: https://docs.atlassian.com/atlassian-confluence/5.9.1/com/atlassian/confluence/user/ConfluenceUserImpl.html#getEmail--

You can see other supported methods, classes etc in the Javadocs but the objects should be in the context for you to use it.