Can you populate a default value based on another field?

[Nannette Mori]

I created a multiline text field to house a set of Instructions.  The set of instructions are dependent on the ticket type.

Is there a way to change the text in the default value option of a field based on another field

If ticket type = Database

the default value text would have specific set of instructions

if ticket type = Special Instructions

the default value text would have instructions for Special instructions.  I want the text to display during the creation of the issue not after the issue has been created. That is why I am setting the text in the default value of my custom field.  

[Trudy Claspill]

When I worked with JIRA Server a few years ago, I think I was able to do that with the Adaptavist Scriptrunner app. I think it may have been the Behaviors feature that I used.

There might be other ways to do it with other apps, but I don't think JIRA provides functionality for doing that without an app.