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Message-ID: <1372953269.FrdeS7i7de@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Thu, 04 Jul 2013 16:26:39 +0200
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Subject: Re: Ajax issue
Newsgroups: comp.lang.javascript
References: <492ccf76-c92f-4b97-85d9-1f1f926bedee@googlegroups.com> <f67e3cc5-5fad-4650-86ab-e7b6e9770b9e@googlegroups.com>
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Xref: csiph.com comp.lang.javascript:20546

Bart Van der Donck <bart@nijlen.com> wrote:
                    ^^^^^^^^^^^^^^^
Wrong, see RFC 5536 and <http://www.google.com/intl/en/policies/terms/>.

> saurabh...@gmail.com wrote:
>> I am trying to make 2 ajax calls on a button click in
>> javascript. The response of the first web service will
>> decide whether the second ajax calls should be made or
>> not. When I am trying to call the second web service
>> in the success function of the first one, I am able to
>> get the response but the HTML UI freezes. But if I
>> make a single ajax call and displays its response, it
>> works fine.
> 
> Some ideas:
>  
> 1. You're talking about calling [cit.] "the second web service in the
> success function of the first one". This is not recommended;

Wrong.

> it is better to cleanly finish the first AJAX-function before proceeding;

That has happened when the “success function of the first one” is called.

> 2. A 'setTimeout()'-function *might* *maybe* help;

Wrong.  A setTimeout() call will increase the risk of a timing problem as 
you can never know how long it takes to receive and process the first 
response.  Using the event listener is the safe approach.
  
> 3. Common 'XMLHttpRequest'-techniques typically use some variables. You
> would want to make sure that none of those are repeated in the second
> function,

Wrong.  Instead, it is wise to reuse variables that are no longer used.

> and that their scoping is correct;

Correct.  A common mistake is to use the same XHR object twice, while the 
response handling for the first request with that object is still in 
progress.  XHR libraries like JSX:http.js implement approaches that prevent 
that from happening.
  
> 4. Not to say that AJAX is bad, but similar techniques exist which form
> IMHO certainly a good alternative, such as iframes or server-side logic.

Utter nonsense.

-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.