transition the next sub-task when previous sub-task is Closed w/ Script Runner

A H

I need help with creating a script for Script Runner plugin.

I need to a script to transistion the next Sub-Task in a sequence from Open to In Progress, when the previous sub-task is set to Closed.

I would like a sequential chain -

Sub-Task 1 -> Closed -> Move status of Sub-Task 2 to In Progress

Sub-Task 2 -> Closed -> Move status of Sub-Task 3 to In Progress

Sub-Task 3 -> Closed -> Move status of Parent issue to Closed

There could be as many as 50 sub-tasks under 1 issue (Task, Improvment, etc).

I really need help with this scripting, as I have never created or worked with this try of scripting before.

Many Thanks.

AndreH

Use workflow tool box plugin and links within sub-tasks