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iFrames - accessing elements

ankur rathi
Ranch Hand

Joined: Oct 11, 2004
Posts: 3830
Hi,

It's related to iFrames.

Say I have two iFrames in a page which renders (embeds) two other pages. Now,

I can access element of an iFrame in parent page like this:

document.aFrame.document.getElementById("anId").value

where aFrame is name of one of the frames.

I can access element of an iFrame in another iFrame like this:

parent.document.aFrame.document.getElementById("anId").value

So far it's working in all the major browsers (IE, FireFox & Chrome).

Now what if I include pages of two different domain e.g.

Instead of this:

<iframe src="f1.html" name="aFrame" />
<iframe src="f2.html" name="bFrame" />

I'll have:

<iframe src="http://www.a.com/index.html" name="aFrame" />
<iframe src="http://www.b.com/index.html" name="bFrame" />

Will I be able to access elements of an iFrame in parent page or in other iFrame?

I heard that browsers prevent this due to some security reasons. I also don't get alert(document.aFrame.document) when aFrame iFrame contains say google.com or javaranch.com but I get an [object] in alert when aFrame contains f2.html (a page in same domain).

What if I include a sub domain page in an iFrame which is in a page of parent domain e.g. myDomain.com has a page contains iFrame and this iFrame refers a page of something.myDomain.com (sub domain of myDomain.com)? Will I be able to access each others elements?

My main problem is I don't know how do i simulate this sub domain situation. I don't own any domain. Is it possible to do it locally?

Thanks.

Eric Pascarello
author
Rancher

Joined: Nov 08, 2001
Posts: 15376
    
    6
How to simulate a sub domain?

DO you have firebug? Use the console or the address bar to inject an iframe into the page with createElement and appendChild. This way you can add an iframe into the page with a site that has subdomains.

Eric
 
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subject: iFrames - accessing elements