Live Fields
Life fields is one of the most powerful features from JJUPIN. If you use it right, you can do pretty much what you want with the standard and fields from JIRA, the custom fields provided by our add-ons and some other graphic elements (buttons, tabs, etc).
By using one or more from our many helpful routines you can restrict some users visibility on issue fields, change issues fields values automatically when a field value changes or even want to execute your own javascript code.
See how Live Fields work.