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Message-ID: <2454054.W8v1AkpiNS@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Thu, 02 May 2013 21:20:53 +0200
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Subject: Re: iframe scrolled by how much
Newsgroups: comp.lang.javascript
References: <HqidnRXFEeGYgh_MnZ2dnUVZ_gSdnZ2d@westnet.com.au> <XnsA1B48E1A8BC9Ceejj99@194.109.133.133> <7b2dnVaGSOsFwx_MnZ2dnUVZ_vKdnZ2d@westnet.com.au>
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Andrew Poulos wrote:

> On 2/05/2013 9:58 PM, Evertjan. wrote:
>> Andrew Poulos wrote on 02 mei 2013 in comp.lang.javascript:
>>> If I get a reference to an iframe using
>>>     var myfrm = document.getElementsByTagName("iframe")[0];
>>> how do I get the scrollLeft and Top of the iframe?
>>
>> function showScrollTop() {
>> var frm = document.getElementsByTagName("iframe")[0];
>> frm = (frm.contentWindow || frm.contentDocument);
>> frm = (frm.document || frm);
>>
>> alert('Top: ' + frm.body.scrollTop+'px');
>> alert('Left: ' + frm.body.scrollLeft+'px');
>> };
>>
>> Works only in same domain, so also not local [without localhost ?].
> 
> To get IE9 to return anything but 0 I had to use documentElement:
>     window.alert('Top: ' + frm.documentElement.scrollTop + 'px');
> 
> Does it mean that the possible permutations are
> 
> document.gEBTN("iframe")[0].contentWindow.document.body
> document.gEBTN("iframe")[0].contentWindow.document.documentElement
> document.gEBTN("iframe")[0].contentDocument.body
> document.gEBTN("iframe")[0].contentDocument.documentElement
> 
> ?

Yes, if you cannot control the content of the iframe and so, which rendering 
mode will be used.  However, it is easier to access the iframe context's 
WindowProxy object by name or index, using the “frames” collection:

  window.frames["myiframe"].document.body
  window.frames["myiframe"].document.documentElement

  window.frames[0].document.body
  window.frames[0].document.documentElement

This referencing, which originates from “DOM Level 0”, is specified in HTML5 
(CR):

<http://www.w3.org/TR/2012/CR-html5-20121217/browsers.html#the-window-
object>

(The WindowProxy object appears to be underdefined, but one can see where 
this is going.)

-- 
PointedEars

Twitter: @PointedEars2
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