Rails spinoffs - Oct 2007 - Prototype Ajax.Request problem: no data in responseText

I''m experiencing some behavior I find very strange when using
prototype''s Ajax.Request (happens in both 1.6.0RC1 and 1.5.1.1).  When
using ''post'', about 90% of the time no data is returned in
transport.responseText.  (Making the same request over and over with
identical data)  When using ''get'' it fails about 10% of the
time
(again, identical data).  When I hit the target page in a browser
window I never get an error.  If I hit a different target page I get
the same error rates.  When I roll my own ajax code I get zero
errors.  Help?

function sendAjax(strID) {
	new Ajax.Request(''ajaxPage1.cfm'',
	{
		method: ''post'',
		parameters: ''id=''+strID,
		onSuccess: function(o){HandleResponse(o,strID);},
		onException: handleException
	});
}

Until I added the exception handler I was completely lost as the
errors were getting caught and it failed silently.  The target page
returns a JSON string but that shouldn''t matter since if i change the
target page to home.cfm it still returns an empty responseText most of
the time.


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On 23/10/2007, chloraphil
<chloraphil-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> I''m experiencing some behavior I find very strange when using
> prototype''s Ajax.Request (happens in both 1.6.0RC1 and 1.5.1.1). 
When
> using ''post'', about 90% of the time no data is returned
in
> transport.responseText.  (Making the same request over and over with
> identical data)  When using ''get'' it fails about 10% of
the time
> (again, identical data).  When I hit the target page in a browser
> window I never get an error.  If I hit a different target page I get
> the same error rates.  When I roll my own ajax code I get zero
> errors.  Help?
>
> function sendAjax(strID) {
>         new Ajax.Request(''ajaxPage1.cfm'',
>         {
>                 method: ''post'',
>                 parameters: ''id=''+strID,
>                 onSuccess: function(o){HandleResponse(o,strID);},
>                 onException: handleException
>         });
> }
>
> Until I added the exception handler I was completely lost as the
> errors were getting caught and it failed silently.  The target page
> returns a JSON string but that shouldn''t matter since if i change
the
> target page to home.cfm it still returns an empty responseText most of
> the time.
I have found that at any stage a proxy can bugger things up. Not sure why.

My solution is to add a timestamp to every ajax request using the
following auto responder ...

document.observe(''dom:loaded'', function() {
	Ajax.Responders.register ({
		onCreate: function(o_Requester) {
			// Timestamp each AJAX action.
			var o_Date = new Date();
			o_Requester.url 				o_Requester.url +
				(o_Requester.url.indexOf(''?'') == -1 ?
''?'' : ''&'') +
				''Stamp='' + o_Date.getTime();
		}
	});
});

So, every request now has a new GET parameter.

This means every request is unique and SHOULD void all caching by proxies.

It is working for me.

YMMV.

Regards,

Richard.

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

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Hi Richard,

Thanks for the reply.

I don''t believe the issue with caching you''re talking about is
what''s
causing my problem.  For one, i''m using ''post'' which
as I understand
it will not be cached.  Second, i''m including a random number in my
parameter list in my real code, I just removed it for simplicity.  For
good measure I added that random parameter to the actual url and the
problem persists.

Any other ideas?  Just for kicks I ran my hand-coded ajax request next
to the prototype Ajax.Request and they both worked, but when I only
run the Ajax.Request it bombs.  Weird.

I''ve checked my server logs and it''s not recording any errors
that I
can see.

Thanks,
chloraphil


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I''ve made an interesting discovery... if i provide no parameters via
the Options object then the call succeeds - with an error message from
the server, of course, but still.  This happens whether I remove
"parameters: ''id=''+strID, " , or set its value to an
empty string.
Weird!  If I provide my parameters in the url then it works, but I
really want to know what the hey-ya is going on.

On Oct 23, 11:20 am, chloraphil
<chlorap...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi Richard,
>
> Thanks for the reply.
>
> I don''t believe the issue with caching you''re talking
about is what''s
> causing my problem.  For one, i''m using ''post''
which as I understand
> it will not be cached.  Second, i''m including a random number in
my
> parameter list in my real code, I just removed it for simplicity.  For
> good measure I added that random parameter to the actual url and the
> problem persists.
>
> Any other ideas?  Just for kicks I ran my hand-coded ajax request next
> to the prototype Ajax.Request and they both worked, but when I only
> run the Ajax.Request it bombs.  Weird.
>
> I''ve checked my server logs and it''s not recording any
errors that I
> can see.
>
> Thanks,
> chloraphil

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also, it works in IE, but not Firefox.  any ideas?


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On 23/10/2007, chloraphil
<chloraphil-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> also, it works in IE, but not Firefox.  any ideas?
Can you try ...

parameters: {id : strID},


This is how I set parameters to the POST (I amend the action for the
GET to include my timestamp).



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

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Yep, I tried that as I saw that style in the docs but the problem
remains.... I also tried using postBody but no dice.

On Oct 24, 5:02 am, "Richard Quadling"
<rquadl...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:
> On 23/10/2007, chloraphil
<chlorap...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > also, it works in IE, but not Firefox.  any ideas?
>
> Can you try ...
>
> parameters: {id : strID},
>
> This is how I set parameters to the POST (I amend the action for the
> GET to include my timestamp).
>
> --
> -----
> Richard Quadling
> Zend Certified Engineer
:http://zend.com/zce.php?c=ZEND002498&r=213474731
> "Standing on the shoulders of some very clever giants!"

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OK, I found the problem and it''s my fault not prototype''s or
whatever.  The ajax call is being kicked off by a popup window and it
updates a row on the main page.  The problem is that the popup page
was refreshing before the ajax call was complete, somehow causing the
response to be empty.  To fix it I put the function call inside a
setTimeout.

Thanks for your help, Richard.

-chloraphil

On Oct 24, 12:58 pm, chloraphil
<chlorap...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Yep, I tried that as I saw that style in the docs but the problem
> remains.... I also tried using postBody but no dice.
>
> On Oct 24, 5:02 am, "Richard Quadling"
<rquadl...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
> wrote:
>
> > On 23/10/2007, chloraphil
<chlorap...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > > also, it works in IE, but not Firefox.  any ideas?
>
> > Can you try ...
>
> > parameters: {id : strID},
>
> > This is how I set parameters to the POST (I amend the action for the
> > GET to include my timestamp).
>
> > --
> > -----
> > Richard Quadling
> > Zend Certified Engineer
:http://zend.com/zce.php?c=ZEND002498&r=213474731
> > "Standing on the shoulders of some very clever giants!"

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