I have an application which builds form elements dynamically by issuing asynchronous AJAX requests. The environment is as follows:
The whole lot is running on my laptop
Browser: firefox 3.04
Op sys: Windows Vista Ultimate SP1
Server: Apache 2.2.6
Server code: PHP 5.2.4
For my test I'm issuing two AJAX requests to two different PHP scripts and to slow things down so I can see what;s going on I've put a 5 sec sleep in one and a 10 sec sleep in the other.
What I'm finding is that they always queue up behind each other so they may as well be synchronous requests.
Can someone point me in the right direction?
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I'm using prototype as my ajax framework. If that can't handle simultaneous ajax requests then I need to know about it as my code relies on it! I've posted a question to the prototype discussion group.
I think you have led me in the rigth direction as I've since read that IE and Firefox can handle only 2 concurrent connections to the same server and any more get queued.
Many thanks for your help.
Just a side note, Firefox can have many more than 2 simultaneous HTTP connections open at one time. The default setting on FF3 is 30.
I don't now anything about prototype, not one of the frameworks that I will use. And, like I said, If it is simple AJAX stuff, I generally use my own functions. Hopefully you can get an answer about prototypes ability do do multiple simultaneous requests, I've just been looking and can't seem to find any information on the subject.
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by: Hube02Posted on 2008-12-13 at 08:51:44ID: 23164522
In reality, depending on how you make the requests and the system involved, in many cases the second request will cancel the first request and you may only get the response from the first request. This is dependent on how the JavaScript code that makes the request is created.
There are some frameworks out there that will process multiple simultaneous AJAX requests, though I don't know them off the top of my head.
What is required is to wrap the functions inside other functions, which I believe are called closures. In a way you create a class, or a pseudo class.
I have created my own ajax class that I use for simple things, when I don't want to install an entire framework just to use a little AJAX. You can download this script at http://w3teck.com/hajax.ph