Rails spinoffs - Feb 2007 - get return-value from ajax.request

Hi,
first of all, as I''m new here I want to introduce mysqlf.
My name is Felix, I''m from Hannover, germany and startet that Ajax
thing with prototype about 2 month ago.

Well, everything works OK, but now I habe a problem.

I start a function, that calls another function, where I do an
Ajax.Request.
In the Ajax.Request I use the onComplete-Function to get the JSON-
objectprovided by my php-script.
Now I want one part of the JSON-object to be returned to the first
function.

Example:

var function1 = function(vars)
{
    var return = function2(vars);
    alert(return)  // => undefined
}

var function2 = function(vars)
{
   var opt = {
  	// Use POST
  	method: ''get'',
  	// Send this lovely data
  	parameters: vars,
  	// Handle successful response
  	onComplete: function(t,j)
	{
		var variable = j.Content;
	       return variable;
	}
  }

	new Ajax.Request(''script.php'', opt);
}

I hope you understand what I mean.

Thanx for help.

Felix


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Hi Felix,

Well, this can''t be done by being asynchronous...  Your function call
chain requires synchronous processing, but by default, AJAX requests
are, as the initial A implies, asynchronous: they''ll execute "in
the
background," while your function2 keeps going ahead.

I advise you find another way to fetch this, because if you stick to
your function model (requiring the function''s result is your AJAX
returned value), you''ll need to make your AJAX request *synchronous*,
which essentially means it will kinda freeze the window while it''s
being
processed.  From an ergonomical standpoint, that can be very
inconvenient.  Still, you can do it by setting the asynchronous option
to false.

But beware: that''s like shooting yourself in the foot.  You''d
be better
off devising another workflow for your code...

-- 
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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Well, thanx for your answer.

I thougt it would be that thing but wasn''t sure.
Well, so I have to finde another workaround.

Felix


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On 2/26/07, info-p71QuHlbIm4TPDSnJhnt0wC/G2K4zDHf@public.gmane.org
<info-p71QuHlbIm4TPDSnJhnt0wC/G2K4zDHf@public.gmane.org>
wrote:
>
> Well, thanx for your answer.
>
> I thougt it would be that thing but wasn''t sure.
> Well, so I have to finde another workaround.
>
> Felix
>
You can export your ''alert(return);'' in a dedicated function :
var function3 = function(content) {
   alert(content);
}
which will be called by:
...
       onComplete: function(t,j)
       {
              var variable = j.Content;
              function3(variable);
       }
...

Yours,
Nicolas Terray

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Well actually it''s not an alert I want to make, that wouldn''t
be a big
problem :-) But I need the given back content to be placed in
different containers on my page.

So, that''s not the sollution I need.

Thanx, Felix


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On 2/28/07, info-p71QuHlbIm4TPDSnJhnt0wC/G2K4zDHf@public.gmane.org
<info-p71QuHlbIm4TPDSnJhnt0wC/G2K4zDHf@public.gmane.org>
wrote:
>
> Well actually it''s not an alert I want to make, that
wouldn''t be a big
> problem :-) But I need the given back content to be placed in
> different containers on my page.
>
Then just replace the alert by the statements you need :
var function3 = function(content) {
   $(''field'').value = content;
   new Insertion.Top(''div'', content);
   ...
}

Yours,
Nicolas

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On Feb 28, 9:26 am,
"i...-p71QuHlbIm4TPDSnJhnt0wC/G2K4zDHf@public.gmane.org"
<i...-p71QuHlbIm4TPDSnJhnt0wC/G2K4zDHf@public.gmane.org>
wrote:
> Well actually it''s not an alert I want to make, that
wouldn''t be a big
> problem :-) But I need the given back content to be placed in
> different containers on my page.
>

You should consider how Rico (http://openrico.org/) handles that kind
of thing... Of course, this means having some understanding of XML,
but the idea is that if you setup your client code right, it''s your
server scripts that will decide what will be updated on the client,
and what object should handle the request. The lib doesn''t code with a
full documentation yet, but fairly enough for anyone to start basic
examples and grow on it.

Good luck.

-Yanick


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