How to display a dialog message when certain values are selected in a field

[Justin Volden]

Hello,

I am looking for a way to popup a dialog box when certain locations are selected using an nFeed field. The nfeed field is pulling from a CRM database and we have a list of locations that are no longer associated with the organization we are supporting. For numerous reasons I can't just hide or remove the locations unfortunately, so instead I was hoping perhaps the Scriptrunner script fragments feature may provide a way to watch the nfeed value during issue creation and pop a dialogue with a message to the team member that this location is no longer associated with the customer. Problem is I'm fairly new to this platform and have limited java experience, looking for any pointers or examples that may be out there to help kick start finding or developing a solution.

Thank you