How to handle uncaught Exceptions in javascript without a try/catch-block?

Question

What i try to accomplish is to register a global handler to catch all uncaught exceptions. Searching the web i only managed to find people pointing out window.onerror but this doesn't do the trick for me. Apparently window.onerror only gets called upon errors and not upon exceptions. Assume the following code:

    function windowError(message, url, line) {
        alert(message, url, line);
    }
    window.onerror=windowError;
    throw("uncaught");

The obviously uncaught exception won't trigger the windowError handler. (Using Firefox 3.6.3)

Any suggestions?

The above code works great on chrome v12. Cheers.

Ben Clayton
– Ben Clayton

2011-06-09 12:45:51 +00:00
Commented Jun 9, 2011 at 12:45 — Ben Clayton
– Ben Clayton, Commented Jun 9, 2011 at 12:45

Pablo Cabrera · Accepted Answer · 2010-05-18 18:44:32Z

3

Errors are caught the same way as exceptions in javascript and in fact, in your example the message get's alerted (Firefox 3.6.3).

answered May 18, 2010 at 18:44

Pablo Cabrera

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2 Comments

Taloncor Over a year ago

That is quite odd. It don't get any alert with Firefox 3.6.3.

Pablo Cabrera Over a year ago

I've tried your example on a simple html page and it does work. That's odd that on your Firefox is not 'alerting'... Have you tried on another browser?

JHollanti · Accepted Answer · 2010-05-18 16:39:04Z

2

As far as i know you'll need try/catch blocks to make this happen. That's sort of the point, that you need to know when to handle which kinds of errors.

answered May 18, 2010 at 16:39

JHollanti

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1 Comment

Anders Over a year ago

found this post when googling for how to catch unhandeled javascript exceptions. You cant foresee all type of exceptions that will happen in a given code. window.onerror is a good way to at least display error. I have gone further and on my site i post the data in the window.onerror event to a webmethod on my server and logged the error to the app log.

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