I have a page with table layout which has an AJAX request sent on body onLoad event, during this time the table cells show static text like "Loading". The table cells are later updated with the AJAX response. So when I try to move out of the page once the AJAX request is sent by clicking on a link for exmple, the "Loading" changes to "undefined" . I read that innerHTML is not supported by firefox for table cells so i started using div inside the table cell yet no result. However IE and Opera seems to work fine. could anyone please tell me where am going wrong ?? Thanks a ton
May 7 '08
23  2875 
Cool, thanks a lot. I would have a go at it and let you know. Appreciate the time you had spent on this.
Cheers
Plater 7,872
Recognized Expert Expert
I have noticed on FF a lot when using the FireBug addon that it shows various javascript functions as "undefined" when you attempt to navigate away from a page, that might have pending javascript code running.
I dont think FireBug is the issue in my case, as it shows 'undefined' even in other boxes with no firebug on.
acoder 16,027
Recognized Expert Moderator MVP
Yes, it seems it's only triggered if you leave the page.
I'm not sure what might be triggering it, but perhaps you need to abort the request onunload.
The XMLHttpRequest object has an abort() method which you can use or set the variable to null. Just make sure that the request hasn't already finished. If it has, then there's nothing to worry about anyway.
Plater 7,872
Recognized Expert Expert
Well I get the undefined error for other functions that have no relation to the xmlhttprequest stuff. They shouldn't even be being accessed, but firebug still likes to throw errors for it.
I tried nulling the xmlhttp object, but still remains the same. I dont really understand how the error gets triggered. Not all the table cells show undefined, only two columns does that. The other column which is also updated with the AJAX response goes blank instead of saying undefined. There are no differences between these columns though. I cant think of a reason why firefox would do it... any suggestions??
Plater 7,872
Recognized Expert Expert
If you try to call a method/function on an object that doesn't support it, you frequently are returned "undefined"
Like trying to use TOSTRING() vs toString() and such.
Problem sorted,
" xmlObj.readySta te == "4" || xmlObj.readySta te=="complete" "
This is the line that had the problem. The readyState receives only a numeric response and no string. So this was breaking the script here when i compare readyState to "Complete" and was returning an empty responseText all the time. So when i tried to split responseText and add it to the div elements the first element went null and the others were saying undefined.
Any explanation on why this would break in firefox alone would be appreciated.
Thanks for all your help guys
Cheers
Plater 7,872
Recognized Expert Expert
IE "doesn't care"?
Also, I notice that in IE, the ready state will be set to a winsock error code number when such events arrive (like host not found), whereas FF throws a javascript exception. So be sure to use try/catch statements.
acoder 16,027
Recognized Expert Moderator MVP
Did you have it as:
xmlObj.readySta te == "4" (string) or
xmlObj.readySta te == 4 (integer)?
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