How to find out which JavaScript events fired?

I have a select list:

  Open
  Closed

When I select Closed the page reloads. In this case it shows closed tickets (instead of opened). It works fine when I do it manually.

The problem is that the page does not reload when I select Closed with Watir:

browser.select_list(:id => "filter").select "Closed"

That usually means that some JavaScript event is not fired. I can fire events with Watir:

browser.select_list(:id => "filter").fire_event "onclick"

but I need to know which event to fire.

Is there a way to find out which events are defined for an element?