In previous recipes, we have looked at using workflow conditions, validators, and post functions that come out of the box with Jira and from other third-party apps.

In this recipe, we will take a look at how to use scripts to define our own validation rules for a workflow validator. We will address a common use case, which is to make a field required during a workflow transition only when another field is set to a certain value.

So, our validation logic will be as follows:

• If the Resolution field is set to Done, the Solution Details field will be required.
• If the Resolution field is set to a value other than Fixed, the Solution Details field will not be required.