Dynamic form properties

I want the form properties to be dynamic based on the values of process variables.
To be specific, I accept multiple files in one of the user tasks and they are all optional. If the file is uploaded in that user task, then i want to verify them in this current user task. I don’t know the files that were uploaded in the previous task as they are optional. Now i thought of checking for the presence of the process variable set in the previous task, based on that, the form property should be enabled or disabled. How do i achieve it?

eg:
Task1 -> Upload doc1(form property), upload doc2(form property)
Task2 -> If doc1 was uploaded in Task1, then verify doc1(form property)
If doc2 was uploaded in Task1, then verify doc2(form property)

Hi,

Are you referring to form properties that can be defined for a user task and are part of the BPMN XML definition, or are you referring to the JSON based form definitions that can be created using the Flowable Modeler?

Best regards,

Tijs

@tijs, I am referring to the BPMN XML definition. Thanks