Javascript: Programmatically trigger onbeforeunload/onunload event

Question

How can I programmatically trigger onbeforeunload and onunload events?(No jquery please). I've tried:

var event = new Event('onbeforeunload');
event.initEvent("onbeforeunload", true, true);
window.document.dispatchEvent(event);

Answer 1

Either use

object.onunload=function(){myScript};

or the addEventListener() method:

object.addEventListener("unload", myScript);

to trigger the event use object.unload();