Perplexed Labs - Latest Comments in PHP jQuery AJAX Javascript Long Polling

Re: PHP jQuery AJAX Javascript Long Polling

Cuongnv2008 — Sat, 23 Feb 2013 23:08:10 -0000

great

Re: PHP jQuery AJAX Javascript Long Polling

AttitudeMonger — Fri, 25 May 2012 08:20:24 -0000

Can you give a tutorial where PHP polls memcache to retrieve data?

Re: PHP jQuery AJAX Javascript Long Polling

Matttieu — Tue, 15 May 2012 15:51:03 -0000

Re: PHP jQuery AJAX Javascript Long Polling

Gaylord — Thu, 08 Mar 2012 06:46:43 -0000

I am not sure if NginX and fastcgi help so much here. You have one running PHP process per connection, right? And that process actively polls backend resources like DB or memcache for new information. That limits your number of connections much more than apache would ever do. How about XMPP, CometD or STOMP with a queue server behind them? Then you dont have such a hard limit on concurrent connections.

Re: PHP jQuery AJAX Javascript Long Polling

waterloomatt — Wed, 15 Feb 2012 12:28:57 -0000

2 years later and still a good article. Thanks!

Re: PHP jQuery AJAX Javascript Long Polling

Jason — Sun, 16 Oct 2011 00:46:10 -0000

Is possible to refactor this to use shorter code and pure JavaScript. Not sure which is best to accomplish simple long polling JavaScript example, but I think I found it on that blog. Thanks!

Re: PHP jQuery AJAX Javascript Long Polling

Kal — Fri, 19 Aug 2011 04:53:28 -0000

Hi, I have successfully implemented the above solution however if i have multiple tabs open then each tab will have a polling process. Is there a way to get around this as really I only want to poll on one tab.

Thanks

Re: PHP jQuery AJAX Javascript Long Polling

Kal — Thu, 18 Aug 2011 05:38:01 -0000

Great stuff!

I have successfully implemented this solution. However if I have multiple tabs open the notifications to duplicated. Is there any way to prevent this?

Re: PHP jQuery AJAX Javascript Long Polling

Bbestkhalid — Thu, 16 Jun 2011 09:56:35 -0000

Great work.
also here you can find the demo and pool script here, http://www.webfreescripts.com/?p=1380
its easy and interesting.

Re: PHP jQuery AJAX Javascript Long Polling

NoICE — Mon, 04 Apr 2011 18:45:20 -0000

You need to add "async:true" to config options for the main ajax request

Re: PHP jQuery AJAX Javascript Long Polling

Vdecaux83 — Fri, 01 Apr 2011 10:12:24 -0000

Nice article, but can we make an other ajax-call ? While the ajax-long-polling is running ?

I don't think so, so we block any ajax actions ? Or I am wrong, I have just tried, and I've got this error.
Thanks !

Re: PHP jQuery AJAX Javascript Long Polling

Mirgorod Vadym — Sun, 16 May 2010 15:48:07 -0000

It is very nice. I'll try this tommorow. Thanks to author :)

Re: PHP jQuery AJAX Javascript Long Polling

Matt M. Kaufman — Sun, 28 Mar 2010 02:41:33 -0000

Hello,

Awesome post on jQuery and PHP implementation!

I like the 30 second handler implementation...really simple and good idea to handle it there...

Re: PHP jQuery AJAX Javascript Long Polling

TJ Mapes — Tue, 01 Dec 2009 16:37:28 -0000

Wow great post, does this FB Work?

Re: PHP jQuery AJAX Javascript Long Polling

Marko Jovanovic — Tue, 15 Sep 2009 15:51:53 -0000

Thank you... Thank you...Hey did i say THANK YOU!
You probably saved 2 weeks of my life :)

Re: PHP jQuery AJAX Javascript Long Polling

imwoodie — Sat, 12 Sep 2009 21:23:08 -0000

thanks for correction in memcache matt, great..

sorry, the code above was alert(bidid) not alert('bidid');
the alert box is displayed well with returned data from xml
it works in all browser except in I.E all version
in I.E the alert box is not displayed.. that's the problem

Well anyway I just have find the way to make it works in IE
I changes the lpStart function as follow:

var lpStart = function() { $.ajax({ type: "POST", cache: false, url: "proc.php", success: lpOnComplete }); };

as u suggest for the memcache in proc.php i put this following code..
<data>" . memcache_get($memcache_obj, 'bid') . "</data>"; // data is always new if(!empty($data)){ Header("Content-Type: text/xml"); flush(); usleep(1000000); echo $data; break; } } ?>

it's using 2 thread on apache with keep alive connection, better than using setTimeout or setInterval, which use 60 thread for every second retrieving new data.

I hope it help the other who get the problem in IE.. this browser always make me work twice..
Thank you matt.. much appreciated.

Re: PHP jQuery AJAX Javascript Long Polling

Matt Reiferson — Sat, 12 Sep 2009 14:26:01 -0000

A couple things.

You should move your memcache connection line outside the while loop - you don't want to reconnect every iteration.

$data, the way you have it written, can never be empty so the loop will always only run one iteration.

If there are no script errors being reported, is an empty alert box being displayed?

Re: PHP jQuery AJAX Javascript Long Polling

imwoodie — Sat, 12 Sep 2009 13:02:26 -0000

thanks for reply matt.. appreciate.

well there's no error code in I.E, I'm not using jason but xml as a data..
here are code that I try to implement :

Re: PHP jQuery AJAX Javascript Long Polling

Matt Reiferson — Fri, 11 Sep 2009 13:11:55 -0000

have you tried enabling script debugging to see what line of code is causing the problem?

Re: PHP jQuery AJAX Javascript Long Polling

imwoodie — Thu, 10 Sep 2009 03:37:59 -0000

Hi, I'm using jquery-1.3.2.. I try to implement your code and is running well in FF, safari, and opera. but it doesn't work in IE.. would you like to give me a clue.. thank you

Re: PHP jQuery AJAX Javascript Long Polling

d1Mm — Thu, 03 Sep 2009 10:39:36 -0000

> sleep(25000);
it's about 7 hours ;)
may be usleep(25000) ?

Re: PHP jQuery AJAX Javascript Long Polling

Az — Thu, 25 Jun 2009 12:02:13 -0000

Try session_write_close(); I wasted 2 weeks of my life to get rid of it, But session_write_close() helped me. Problem was exactly the same.

Re: PHP jQuery AJAX Javascript Long Polling

Dave — Wed, 10 Jun 2009 04:32:11 -0000

OK, thanks Matt, much appreciated.

Re: PHP jQuery AJAX Javascript Long Polling

Matt Reiferson — Tue, 09 Jun 2009 19:16:40 -0000

Dave,

I think you're thinking about this wrong. You don't need FastCGI in order to scale an app that uses this technique. FastCGI just happens to be a common interface of servers that are able to scale with an app using this technique.

Lighttpd would be my suggested choice given that it's easy to get PHP up and running on it and is fairly easy to install.

-Matt

Re: PHP jQuery AJAX Javascript Long Polling

Dave — Tue, 09 Jun 2009 18:19:35 -0000

What about LiteSpeed with FastCGI support? Any known issues with that or does it fall under the same category as Lighttpd and nginx?

Thanks,

Dave