catch an exception from event handler

[Dormilich]

I was wondering, where I should catch an exception thrown from a function that is executed onevent…

// let’s say we have an AJAX call
XHR.onreadystatechange = function ()
{
	if (4 === this.readyState) {
		if (200 !== this.status) {
			throw new Error("Error: " + this.statusText);
		}
		// process response
	}
};

this would be OK for most GET/POST requests, but what to do if I make a HEAD request and get a 404 status?

[Dormilich]

well, at least I found that I can use the onerror event handler in Firefox.