Rails - Jan 2008 - OT: Dynamically calculating the height of an HTML document

Apologies for the off-topicness, this is really a Javascript question,
but I figure someone here may know how to do it.

I need to dynamically add a "footer" to an already existing HTML page,
sight unseen.

Currently, I insert a <div> element just before the </body> end tag,
and
this works most of the time.   But, sometimes the <div> is rendered to
the right of a table _if_ the entire page is laid out in one big table.

I have been unable to come up with a way to force my content into the
lower left hand corner, even using absolute positioning CSS directives
(in one case, the table extends beyond what the browser thinks the
"bottom" of the page is).

I''m looking for a way to inspect the DOM to figure out the height of
all
of the existing content on the page, then I figure I can absolute
position with a left margin of 0 and a top margin of <whatever the
height of existing content is>.

I tried getting document.body.offsetHeight, but this returns 0 in both
FF and IE.

Anyone have any ideas how to do this, without resorting to manipulating
any of the existing HTML?

Thanks,
Wes
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without manipulating the html. Well you could throw it out completely 
which is never a wrong move when facing a tabular layout but i digress.

Your best bet is to insert at the end of the body element the footer 
content and just above the footer a clear (ie:

<div class="clear">&nbsp;</div>
<div id="footer">
 blah blah
</div>

with css:

#footer{
 float:left;
}

.clear{
 clear:both;
 height:0;
 font-size:0;
}

-K
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Keynan Pratt wrote:
> without manipulating the html. Well you could throw it out completely 
> which is never a wrong move when facing a tabular layout but i digress.
Unfortunately, this is submitted HTML and I don''t have control over it 
before I need to add my footer.

Wes
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Keynan Pratt wrote:
> without manipulating the html. Well you could throw it out completely 
> which is never a wrong move when facing a tabular layout but i digress.
> 
> Your best bet is to insert at the end of the body element the footer 
> content and just above the footer a clear (ie:
> 
> <div class="clear">&nbsp;</div>
> <div id="footer">
>  blah blah
> </div>
> 
> with css:
> 
> #footer{
>  float:left;
> }
> 
> .clear{
>  clear:both;
>  height:0;
>  font-size:0;
> }
> 
> -K
Keynan,

Thanks this works well.  So I guess a one-table layout comes with an 
implied float: left.

Wes
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On 1/17/08, Wes Gamble
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> I''m looking for a way to inspect the DOM to figure out the height
of all
> of the existing content on the page, then I figure I can absolute
> position with a left margin of 0 and a top margin of <whatever the
> height of existing content is>.
>
> I tried getting document.body.offsetHeight, but this returns 0 in both
> FF and IE.
>
> Anyone have any ideas how to do this, without resorting to manipulating
> any of the existing HTML?
You might try examining the HTML with Firebug to see if there''s
something else in the DOM that has a height attribute you can use.
Don''t feel bad if you find nothing, even Gmail uses <br /> tags
for
additional spacing in certain "empty" places.


-- 
Greg Donald
http://destiney.com/

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