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);

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);

• javascript
• events
• onbeforeunload

• Please show your code. – Lance Commented Jul 18, 2015 at 20:44
• 1 possible duplicate of stackoverflow.com/questions/3490331/… – Tushar Gupta Commented Jul 18, 2015 at 20:50
• 2 Possible duplicate of Is it possible to trigger the onbeforeunload event programmatically? – Brilliand Commented Aug 10, 2018 at 23:07
• Note: The above mentioned articles refer to jQuery based solutions. – Thomas Williams Commented Nov 8, 2019 at 11:02

2 Answers 2

window.dispatchEvent(new Event('beforeunload'))

I think this would be the best way in 2020. In case anyone finds this.

window.addEventListener('beforeunload',()=>{console.log("beforeunload triggered")})
window.dispatchEvent(new Event('beforeunload'))

Either use

object.onunload=function(){myScript};

or the addEventListener() method:

object.addEventListener("unload", myScript);

to trigger the event use object.unload();