HTML5 `window.onerror` enhancement: getting a reference to the actual `Error` object! Also, test suites for `onerror` and `ErrorEvent`.

window.onerror.md

Original Proposal

https://gist.github.com/JamesMGreene/3ded0f6e7f0a658b9394

Final Outcome

window.onerror = function(msg, url, lineno, colno, error) {
  // `window.onerror` handlers now have a 5th argument: the `Error` object itself (or `null`).
  // This can then be used to get stack info, error type/name, etc.
};

Indirectly related to this was the introduction of the ErrorEvent.

Final HTML spec commit(s)

• http://html5.org/tools/web-apps-tracker?from=8085&to=8086
• (and a typo fix for my name): http://html5.org/tools/web-apps-tracker?from=8091&to=8092

Test Suites

• http://jsfiddle.net/JamesMGreene/D6nNy/
• http://jsfiddle.net/JamesMGreene/3Lqv8/
• http://jsfiddle.net/JamesMGreene/MYgpY/
• http://jsfiddle.net/JamesMGreene/AVZqv/

Related Blog Posts

• https://mikewest.org/2013/08/debugging-runtime-errors-with-window-onerror

Discussion

2012

2012 May

1. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035732.html
2. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035737.html
3. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035738.html
4. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035761.html
5. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035777.html
6. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035781.html
7. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035782.html
8. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035783.html

2012 August

1. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-August/036833.html
2. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-August/036835.html

2012 November

1. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-November/038156.html
2. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-November/038170.html

2013

2013 February

1. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-February/038847.html
2. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-February/038848.html
3. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-February/038849.html
4. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-February/038850.html

2013 March

1. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-March/039111.html

2013 July

1. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040019.html
2. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040032.html
3. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040053.html
4. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040054.html
5. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040033.html
6. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040035.html
7. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040041.html
8. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040223.html
9. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040225.html
10. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040226.html
11. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040260.html
12. http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-July/040262.html