2009/7/16 foolged <fool...@gmail.com>:
> 1494: success: function() {
> 1495:   var status = this.getStatus();
> 1496:   return !status || (status >= 200 && status < 300);
> 1497: }
> Why  !status  checked in line 1496?
> Because of this, an event onFailure not triggered when the status is
> == 0.
> IMHO rightly so, without !status.
> 1496: return (status> = 200 & & status <300);
> >


I recently read [1] regarding "How To - Bulletproof Ajax Requests".

Out of that "How To", I see that the use of an on0 callback is useful.

I would like to be able to use an on0 Responder. Defining an on0
callback for every request/periodical/update AJAX call sort of rubs me
wrong. Duplication of code, maintenance issues, etc.

Having a global responder for on0 would allow me to define in a single
place how I want to handle the demise/inaccessibility of the web

Currently, there is no support for the onXYZ responders, just
callbacks which need to be defined for every

I've had a ticket (with a patch) which I've been using for over 2
years now [2]. The patch on the ticket is probably out of date. I can
submit a new one if required.

The one thing that is slightly different about the onXYZ responders is
that they can control the cascade to the onSuccess/onFailure callback.
If the onXYZ responder returns true, then the normal
onSuccess/onFailure callback can be called. If false, this inhibits
the onSuccess/onFailure callback. Specifically, an on0 responder
should return false to stop the onSuccess route from being followed.

Is there any interest in such a mechanism?


Richard Quadling.

[1] http://proto-scripty.wikidot.com/prototype:how-to-bulletproof-ajax-requests
[2] http://dev.rubyonrails.org/ticket/9690

Richard Quadling
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
"Standing on the shoulders of some very clever giants!"
ZOPA : http://uk.zopa.com/member/RQuadling

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