Trigger (dispatchEvent) the 'onerror' with javascript?

Question

In my code I did: element.onerror = my_function;

I am wondering how to forcefully trigger this event so I can test it?

Can someone show me how to use the dispatchEvent flow to do this?

Answer 1

您可以使用element.dispatchEvent 。

Answer 2

OKAY I figured it out!

var evt = document.createEvent('HTMLEvents');
evt.initEvent('error', false, false);
element.dispatchEvent(evt);

I figured out that onerror is an 'HTMLEvents' according to google. Since the event name is error , the event is error , and I knew that error doesn't bubble, hence the false in the second parameter of initEvent .