Comments on: Encapsulating Ajax XMLHTTPRequest Calls within JavaScript classes

By: abh

abh — Fri, 22 Feb 2008 06:19:02 +0000

The file download link does not work. Why don’t you remove that?

By: Justin

Justin — Thu, 06 Dec 2007 03:10:59 +0000

This code:

request.onreadystatechange = this.response_handler ();

returns error “Object Doesn’t Support This Property or Method” and has to be replaced with this code:

var _this = this;
request.onreadystatechange = function() {_this.response_handler ()}

where function request_handler is your function, whatever you named it.

I came up with this after I read your post. Thank you so much. I hope this will help others too.

By: SingIT

SingIT — Mon, 08 Oct 2007 22:47:23 +0000

Hi there, your article has proven very useful
thank you.

By: Kehiokkk

Kehiokkk — Mon, 09 Jul 2007 04:45:40 +0000

Thank you!
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By: Chris

Chris — Tue, 01 May 2007 02:12:58 +0000

Somebody else has mentioned this, too, but nice little hack making this a local var and then setting it as as the onreadystatechange function. I’ve spent a few hours trying to figure this out. Thanks!

By: Frank C

Frank C — Thu, 28 Sep 2006 19:16:42 +0000

PLEASE NOTE THERE IS A SMALL SYNTAX BUG!!!!!

I confirmed this with Mike, the “onData” section has a small bug in the code, the line:

this.onError({status:this_request.status,

actually should be

this.onError({status:this._request.status,

with a period after this.

Thanks all,

By: fernando trasvina

fernando trasvina — Sat, 26 Aug 2006 04:40:38 +0000

thanks for the lil class im being able to correctly use the callback function now to my constructor

By: Jorge Luna

Jorge Luna — Wed, 09 Aug 2006 14:22:40 +0000

Hi there, your article has proven very useful. And programming using OO is just a breeze.

I have a question that i havent been able to find an answer to, and was hopping any of you could help:

Im loading some content dynamically using AJAX into some page. Whithin the dynamic content I want to make another dynamic call and fill another element. The problem is, the element from the (first) dynamic content is not in the DOM tree! so I cant do a getElementById.

Is there a way to do this that doesn’t involve parsing the conteng into the dom tree?

Thank you!

By: jack

jack — Thu, 03 Aug 2006 21:56:46 +0000

I dont understand the reason for:

this._request.onreadystatechange = function(){_this._onData()};

I think I need some more basic JS knowledge. Could you point me at a resource the explains what is going on there.

By: Vitaly

Vitaly — Mon, 31 Jul 2006 11:49:37 +0000

Works fine in IE but I don’t receive response from the server when using Mozilla Firefox 1.5.05
Could it be some Firefox settings? JS is enabled with all grants. I debugged with alerts, the xmlhttprequest is created with the last option:
xmlHttp = new XMLHttpRequest();
but still no luck.
Even more weird:
in Opera I get till onData but the this._request.responseText is “” - nothing, zilch, zero.