Cross-domain AJAX tutorial anyone??

[shachi]

Hi all,
I was just curious about cross-domain AJAX and I wanted to know how it works ... so if anyone knows how it works or has a tutorial about it please kindly post it here, it may not only help me but also some others who are intrested in this subject. Thanks!!

[blm126]

It is not possible. You can use PHP to get data from another domain, but not with just javascript.

[shachi]

blm126: I *am* using PHP. I don't think that making interactive pages(which do dynamic queries) can be done only with javascript. I hope that it makes sense.:)

[Twey]

I was just curious about cross-domain AJAX and I wanted to know how it worksA server-side script on your domain is used to load and output the content, then the XMLHttpRequest object reads that file like normal. A simple example (not that you should use this, of course; much more checking is required) is:
<?php
// golden.php
die(file_get_contents($_GET['url']));
?>By open()ing:
xhr.open("GET", "golden.php?url=" + encodeURIComponent("http://www.google.com/"), true);that file with the correct GET variable, any page on the Internet can be retrieved.

[shachi]

Twey: even google search results?? and json objects(or whatever)?

[Twey]

Indeed.

[shachi]

Oh cool!!! Can you give me some more examples of data fetching Twey??

[Twey]

Er? What more is there to demonstrate? :-\

[shachi]

I mean can I just bring whole web pages with it and XML data islands??

[Twey]

Of course. Just like you can with normal AJAX. It's just redirected through a server-side script, is all.

[shachi]

Oh cool thing. The only problem I am having is extracting images. Any ideas about that?? I am using the same code you included by the way.

That may be because of incomplete image path(images/someimage.png), isn't it?? If so is there any fix for that??

[Twey]

That may be because of incomplete image path(images/someimage.png), isn't it??Yes.
If so is there any fix for that??Probably using PHP, you must go through all the URLs and convert them to absolute ones.

[shachi]

Well, how do I do that then?? Use str_replace or preg_replace??

[Twey]

You'd probably be able to do it with some complex regex, yes. I'm not all that good with regex though.
You'd have to go through each instance of (src|href)="[^"]+", check if it were an absolute URL, and if not modify it by prepending its host if it began with a / or else its original directory.

[shachi]

I am not at all good at regexps too.:(

[vikasbhagwagar]

For cross domain Ajax...

use CURL + AJAX

Ajax => Request to self domain (.php file with curl code) => call php file of remote server [also allow get/head/post methods... as we are using in payment gateway connection like authorize.net-Advanced technique.]

Now Curl is throwing back output to Ajax in responseXML or responseText.