Jörn Zaefferer schrieb:
> Hi folks,
>
> currently jQuery does not try to handle any programming errors by clients,
> eg. an expression like "[EMAIL PROTECTED]", that is missing a closing bracket
> "]", can result in quite confusing behaviour and is hard to spot. In other
> places, like the problem described in bug #165 (
> http://jquery.com/dev/bugs/bug/165/ ), just catching the exception without
> handling it is a very bad habit, but somewhat necessary to keep the code
> small.
>
> My idea is a small addition, that checks for the existence of a "logging"
> object and uses that to log exceptions or potential errors. This addition
> could be included by developers before jQuery and could help greatly when
> developing and debugging. For production code, the remaining code would add
> only a very small overhead. I'm not sure if this overhead should be removed,
> eg. by the build script when packing the code. Or if it should be kept inside
> the core to enable debugging a live site by including the additional script
> before jQuery, without having to change the jQuery core code itself.
>
> In the case of the problem described by Klaus, the logging could look like
> this:
>
> var modRes;
> try {
> modRes = xml.getResponseHeader("Last-Modified");
> } catch (e) {
> ;;;if(typoeof $.log != "undefined") { $.log.error(e); }
> }
> if ( ifModified && modRes ) jQuery.lastModified[url] = modRes;
>
> The three semicolons would allow the packed to remove the line...
>
> Opinions are very welcome!
>
> -- Jörn
I like that. I would love to have the log object use the FireBug console
if present, otherwise log into some div like Stefan's solution.
Another thought (I wanted to implement that for a long time and maybe
that would make a good plugin): What I want is to log any client-side
errors via Ajax to the back-end log file as a QA action.
What do you think about that?
Like
$(window).error(function(e) {
$.log(e); // not sure how to get the error out of here right now
});
and in try/catch blocks as well:
try {
} catch(e) {
$.log(e);
}
That could even be combined by using a flag. If a variable for example
called debug is set to true the errors are logged to the window/console,
otherwise it logs to a server...
Of course it would need some additional back-end logic. Not sure if it
is doable at all.
-- Klaus
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