Rails spinoffs - Mar 2007 - prototype ajax.updater response bigger than 10k on safari

Hi All,

Safari crashes everytime my ajax response is bigger than 10k, i traced
it down and found out that it breaks when evalScript is being called,
maining when extractScript is trying to match the regex.....

is this a known bug on safari?

if yes is there anyway to get around it?

thanks in advance


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yoshi a écrit :
> is this a known bug on safari?
> 
> if yes is there anyway to get around it?
I ran into string length issues with regex''s on Firefox as well.  As my
regex was fairly simple, I ended up doing a manual global replacement,
which certainly isn''t quite the golden road.

I would be tempted to say you''re not quite supposed to send 10+K of
data
in an AJAX response; that''s not quite what AJAX was designed for, I
mean, 10K feels like a whole, content-rich page, not a page fragment or
JSON data!  But then, Real Life Is Different, I''m sure you''ll
say :-)

In the end, though, your issue remains.  Since Prototype runs
stripScripts (not extractScripts or evalScripts, BTW) on your String,
you do have a regex matching.  It will occur both in evalScripts: true
and evalScripts: false contexts (in Elt.update or A.U.updateContent,
respectively).  So you''re grilled.

The only workaround I see out of my hat just now is, if you *don''t*
have
script blocks, use Ajax.Request and manually write to the target
element''s innerHTML in your own onSuccess callback.  Yewh, I know.

-- 
Christophe Porteneuve a.k.a. TDD
"[They] did not know it was impossible, so they did it." --Mark Twain
Email: tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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yup ideally the 10k response should be seperated in to chunks and make
several requests, but the piece of code that generates the response is
legacy code and touches many java files, so i m not comfortable
changing that.....

ok heres my 1st attack on this, and anyone thinks they have a better
idea plz respond....

i m using ajax.updater currently, my ajax response returns only script
text, contianing the script tag.
Instead of setting ''evalScript: true'' in the method, i set

onComplete: function(response) {
  //some element already loaded that i know is on the page

  var scriptTag = document.createElment(''script'');
  scriptTag.type = ''text/javascript'';
  scriptTag.text = response.responseText;

  $(''bodyContent'').appendChild( scriptTag );
 }

i think appendChild is the same as doing an eval() right guys?

of course the above did not work, but theoritically it should right?

thanks in advance


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On 1 Mar, 10:54, "yoshi"
<yosh...-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org>
wrote:
>
> i m using ajax.updater currently, my ajax response returns only script
> text, contianing the script tag.
> Instead of setting ''evalScript: true'' in the method, i
set
If U have only JavaScript code in the response it will be better if
you don''t send it as a html but as a text/javascript or using X-JSON
http header wich prototype will evaluate automatically.
Read here more:
http://www.prototypejs.org/learn/introduction-to-ajax
search for: "Evaluating a JavaScript response".
> onComplete: function(response) {
>   //some element already loaded that i know is on the page
>
>   var scriptTag = document.createElment(''script'');
>   scriptTag.type = ''text/javascript'';
>   scriptTag.text = response.responseText;
>
>   $(''bodyContent'').appendChild( scriptTag );
>  }
>
> i think appendChild is the same as doing an eval() right guys?
>
> of course the above did not work, but theoritically it should right?
I''''m not sure...
But in Your case I would do:

onComplete: function(response) {
  eval(response.responseText);
}

Nothing more :-)

Greetings

DK


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> onComplete: function(response) {
>   eval(response.responseText);
>
> }
Sorry!
I forgot. According to documentation (the link which I gave U just a
moment before):
"Sometimes the application is designed to send JavaScript code as a
response. If the content type of the response matches the MIME type of
JavaScript then this is true and Prototype will automatically eval()
returned code. You don''t need to handle the response explicitly if you
don''t need to."

So You don''t even need to call eval() - Your JavaScript code will be
evaluated/run automatically.
All You need to do is:
 -  to send http Content-type as for example
''text/javascript'', If You
send Your Ajax response using PHP this would look like this:
	<?php
		header("Content-type: text/javascript");
		echo ''/* javascript code goes here */'';
	?>
 - or request with Ajax a file with ".js" extension (Apache will send
''text/javascript'' automatically)
 - or send X-JSON header. In PHP it woul look like this:
	<?php
		header("X-JSON: ''. ''/* javascript code goes here
*/'');
	?>

Greetings

DK


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by auto eval(), when content type is ''text/javascript'', do u
mean i
dont need to define ''onSuccess: blah blah''?
so assuming i change the content type of the response header, ( i
checked the response header in firebug ) and my ajax.request code
looks like

new Ajax.Request(src, { method:''get''} );

no callback function defined? it didnt work............


WebKit,  works, which means that there should be a bug similar to mine
filed already, maybe i should look at there closed bug list and track
down a work around until the next version of safari is
released.........

lord when safari is 5% of the traffic u pay for every click
counts.............


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On 3 Mar, 02:24, "yoshi"
<yosh...-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org>
wrote:
> by auto eval(), when content type is ''text/javascript'',
do u mean i
> dont need to define ''onSuccess: blah blah''?
> so assuming i change the content type of the response header, ( i
> checked the response header in firebug ) and my ajax.request code
> looks like
>
> new Ajax.Request(src, { method:''get''} );
>
> no callback function defined? it didnt work............
It should.
Check if JS code returned is correct.

Maybe OT but for example, I had such a problem today (that''s why i
read this list now):
I was returning JS code like that
{
  //some object properties using JSON
}
And added onExeption callback in Ajax.Request construtor parameters.
The JSON code returned wasn''t correct for Firefox (throwed an
exception) - it expected the block of expressions (surrounded with
curly braces {}) and in fact it was an object in JS object notation
(surrounded with curly braces too). Surrounding (adding not replacing
ofc) all the Ajax response code in ordinary braces () has solved the
problem.
Of course to get the JSON value I had to eval() it again, because
inner mechanism doesn''t save nowhere/return no way the result of
eval()''s :-(


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