How to show/hide custom field in Redmine accordingly to issue status

I would like to show some custom field in Redmine only if issue status is closed. (I want to log som开发者_StackOverflow中文版e "close reason" information)

So would I but Redmine does not support this. You can monitor Feature #8050 which is asking for this capability.

See this redmine issue: http://www.redmine.org/issues/12005
It is a patch working with Redmine 2.3.x allowing hiding custom fields depending on the state transition.
I am currently adapting it to Redmine 2.4.x and will be posting soon at the same link as above.