Need a Simple OnChange Client Script to Force List Collector to Run/Refresh

I have a catalog item (hr request) that includes a List Collector.

I have a reference qualifier running correctly to filter that list based on the department. I am also hiding the filter section based on the attribute "no_filter". Everything is working fine.

However if the user/agent changes the department, the list collector does not update.

I am looking for an onChange client script that would force the list collector to refresh when the department is changed/

Thanks in advance for help