multiple trigger("change") calls are all combined into single

On a combo box I'm calling multiple times from firebug console:

$("#comState_city").trigger("change");

But only single change event is getting triggered. Why?

I want one separate even to be fired for each call to trigger function.

Or in other way if I change the combo box value two times manually in the browser, the browser i开发者_如何学Pythons executing and showing from server different data for each selected value. This is what I expect from my trigger function.