greasemonkey - Trigger inline onchange javascript -

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i'm writing greasemonkey script creates auto-complete search type box makes easier select large dropdown on webpage. dropdown has inline onchange code can't seem trigger when change selection using javascript. ideas?

suppose the page had like:

<input onchange="somefunction()">

then greasemonkey javascript change input value , call function using:

unsafewindow.somefunction();

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