Trigger event with parameters

Question

This is pretty annoying. I want to just trigger an event in javascript. I need to pass the event object into the parameters as usual and an additional custom parameter.

Answer 1

the event object and an additional custom parameter

That's impossible with the native DOM methods. Handlers are called with only one argument, which is the event object. So if there is any data you need to pass along, you need to make it a (custom) property of your event object. You might use the DOM4 CustomEvent constructor for that (see the MDN docs for a cross-browser shim).

Then use dispatchEvent as you would normally with (custom or native) script-triggered events. For IE below 9, you seem to need to use fireEvent.