How to hide Message custom field when issue change status

[oks]

Hello, 

I have created Message custom field (filed whose default value is displayed as HTML) and need to hide this field /or it's contents from all screens when the issue will arrive to status "In Progress" .  I have try to do it with script in "Post function" on Workflow transaction but it does not work with this type of field (the same script worked for the simple text custom field). 

Is somebody know if there is any possibly to do that in JIRA ?  

Thank you in advance. 

[Nic Brough -Adaptavist-]

A post function can't do anything with a message field - there's no data in the field for it to do anything with.

Jira does not have anything built in for arbitrarily hiding fields, so you will need code to do it.  Behaviours in the Scriptrunner add-on is a good way to do it, saving you have to write all the code manually.