How to Trigger CustomJS on Data Change?

@Nathaniel_Smith This is a really old thread and I don’t know what’s relevant to your issues, or have the bandwidth to try to re-establish context. The most efficient way to to help us help you is to open a new topic with a Minimal Reproducible Example so that we can investigate directly. The short answer is yes, that shouldn’t be an issue, so it’s really necessary to see actual code.