In MSIE/javascript how do I tell if an IFRAME has a vertical scrollbar or not?

[Per Jessen]

This is a javascript question, possibly somewhat inappropriate for this group,
but here we go: (please redirect me to the right place to ask).

In Microsoft Internet Explorer (5 and up) using Javascript how do I detect
whether an IFRAME is displayed with or without a vertical scrollbar? The
initial height of an IFRAME is fixed, so depending on the content, the browser
will render it with a scrollbar or not.

In Netscape et al. this is easy - when iframeobj.contentWindow.scrollMaxY==0,
there is no scrollbar.

I've spent quite a few hours googling, but found nothing.

I'm using iframes as I need to use 2 or more different charactersets on the
same page. (Alternative being converting everything into UTF8 which I am hoping
to avoid).

MTIA.
--
Per Jessen, Zurich
Let your spam stop here -- http://www.spamchek.com

[Martin Honnen]

Per Jessen wrote:

In Microsoft Internet Explorer (5 and up) using Javascript how do I detect
whether an IFRAME is displayed with or without a vertical scrollbar? The
initial height of an IFRAME is fixed, so depending on the content, the browser
will render it with a scrollbar or not.

You can compare
document.body.clientWidth
to
document.body.offsetWidth
for the document in the iframe, these values differ by the width of the
scrollbar. Note that for IE 6 in standards compliant mode you need to
compare
document.documentElement.clientWidth/offsetWidth

--

Martin Honnen
http://JavaScript.FAQTs.com/

[Per Jessen]

Martin Honnen wrote:

In Microsoft Internet Explorer (5 and up) using Javascript how do I detect
whether an IFRAME is displayed with or without a vertical scrollbar? The
initial height of an IFRAME is fixed, so depending on the content, the
browser will render it with a scrollbar or not.

You can compare
document.body.clientWidth
to
document.body.offsetWidth
for the document in the iframe, these values differ by the width of the
scrollbar. Note that for IE 6 in standards compliant mode you need to
compare document.documentElement.clientWidth/offsetWidth

Martin,

thank you very much! *exactly* what I needed.
/Per

--
Per Jessen, Zurich
Let your spam stop here -- http://www.spamchek.com