Comments on: Portable Comet? It’s the IFrame, Stupid!

By: Alex

Alex — Thu, 19 Jul 2007 09:05:59 +0000

Your link (http://ajaxify.com/run/streaming/xmlHttpRequest/iframe/scriptTags/) leads to non-existing page..

By: Shawn

Shawn — Fri, 08 Dec 2006 15:49:40 +0000

Wow, to be honest…you seem to jump to conclusions alot.

The only part I accept is valid is about AJAX and IE, but to be frank…you CAN stream information using XML & ActiveX objects in IE, it’s not the most idealistic as it would require alot of extra coding and unnecessary debugging failsafes (not going to get into too much detail, as it’s not even considered part of AJAX).

Well, to the point, cross-bowser streaming CAN be done using long polling, feel free to look at this link to an example in which the server streams the command at a 5 second delay:
http://www.sentertainment.net/development/ajax/long_polling/

http://www.sentertainment.net/blog/

By: Charlene

Charlene — Sat, 08 Jul 2006 00:25:58 +0000

I found this column when I was searching for info about IFrames and AJAX. I am trying to build a authorization wrapper around an application. This wrapper either displays a login or the application in an IFrame with a logout button added.

I'm having problems making the logout button display only when the application IFrame is visible, and to call the wrapper authorization logout routine.

By: mahemoff

mahemoff — Wed, 28 Jun 2006 07:28:47 +0000

TI, It’s a fair point…Alex’s original Comet article doesn’t only talk about streaming, but also about a distributed event model (as in Twisted). I guess the JSON-P method is a kind of Comet-lite.

By: TI

TI — Wed, 28 Jun 2006 07:26:11 +0000

From what I can tell the Dojo guys propose to decouple things by using their topic event system. The iframe updates the topic with each script tag and any subscribers to this topic are updated. Again the topic needs to be known about but it it’s a bit more elegant (particularly if something fails) than directly calling a function.

By: mahemoff

mahemoff — Wed, 07 Jun 2006 08:37:40 +0000

Heh! CometP, I like it!

By: Chris Double

Chris Double — Tue, 06 Jun 2006 23:40:55 +0000

You could have the server side iframe’s src take a parameter which is the name of the javascript function in the parent window to call (ala JSONP). This would get around the fact that the server has to be coupled to the client by having a known function name.

By: mahemoff

mahemoff — Tue, 06 Jun 2006 17:54:43 +0000

Andi, thanks for the correction, the last link was to my localhost and now fixed.

Brent, glad the post caught your eye, thanks for the background.

By: Brent Ashley

Brent Ashley — Tue, 06 Jun 2006 15:49:54 +0000

1998/99 was when I built my first live ajax-style grid with in-place paging.

The script tag stuff first crossed my radar in 2002 when Danne Lundqvist described it at:

http://dotvoid.com/view.php?id=13

You can see some of the history of these techniques in my Ajax Experience presentation wiki here:

http://www.ashleyit.com/ajax/AjaxExperience.htm#%5B%5BBrowser%20Native%20Transports%5D%5D

I also yammer on about transport layer evolution here:

http://www.ashleyit.com/blogs/brentashley/2006/06/06/ajax-transports-still-need-to-evolve/

By: Andi

Andi — Tue, 06 Jun 2006 10:15:33 +0000

This Link wont work:

http://ajaxlocal/run/streaming/xmlHttpRequest/iframe/scriptTags/