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Hi all,

I'm altering a page whose background color being set in CSS
somewhere. But I need to change the background color
in Javascript. I tried doing so with this:

document.bgcolor = "red";
alert(document.bgcolor);

When run, the value is apparently set because the alert displays
"red", however the page itself does not change color.

Anybody know what's going on?

Thanks.

On 19 Mar 2008, wrote:

> Hi all,
>
> I'm altering a page whose background color being set in CSS
> somewhere. But I need to change the background color
> in Javascript. I tried doing so with this:
>
> document.bgcolor = "red";
> alert(document.bgcolor);
>
> When run, the value is apparently set because the alert displays
> "red", however the page itself does not change color.
>
> Anybody know what's going on?

Yes, but it isn't you... "document.bgcolor" is SO wrong it flabbergasts
me! Google for "document.getElementById" and the css setting "background"
for further information.

--
Neredbojias
http://www.neredbojias.com/
Great sights and sounds

> Yes, but it isn't you... "document.bgcolor" is SO wrong it flabbergasts
> me! Google for "document.getElementById" and the css setting "background"
> for further information.

The body tag has no id, nor can I set one. However I did this

var foo = getelementbytagname("body")
foo.style.background = "red"

....and nothing changed.

Oops, I meant I did this

var foo = document.getelementbytagname("body")
foo.style.background = "red"

...and nothing changed.

This worked

var foo=document.getElementsByTagName("body")
foo[0].style.background="red"

Scripsit :

> The body tag has no id, nor can I set one.

So whose document are you playing with, and why?

> var foo = getelementbytagname("body")
> foo.style.background = "red"

When everything else fails, read the ******* manual. In this case, start
from a primer on JavaScript, preferably a mordern one which is based on
W3C DOMs.

This is simple sample code, just to prove that you need to actually
study JavaScript before trying to use it:

var body = document.getElementsByTagName("body")[0];
body.style.backgroundColor = "red";

Note that JavaScript is case sensitive (and typically uses camelCase for
identifiers).

Beware that this code needs to be placed so that when it is executed,
the document, including the body element, has been loaded and parsed.

Followups trimmed. This is about JavaScript and DOM, not CSS, so both
group choices were wrong, but alt.html (a catchall group) is less wrong.

--
Jukka K. Korpela ("Yucca")
http://www.cs.tut.fi/~jkorpela/

wrote:
> This worked
>
> var foo=document.getElementsByTagName("body")
> foo[0].style.background="red"

Yes it helps when you

a) use the correct function name, yes it is case sensitive
b) take note of the return value

It "works" if client has JavaScript enabled.


--
Take care,

Jonathan
-------------------
LITTLE WORKS STUDIO
http://www.LittleWorksStudio.com

wrote:
> Hi all,
>
> I'm altering a page whose background color being set in CSS
> somewhere. But I need to change the background color in Javascript. I
> tried doing so with this:
>
> document.bgcolor = "red";

This doesn't alter any style. It doesn't do anything, in fact, other
than add a previously nonexistent field called "bgcolor" to the document
object and set its value to "red". Now, the BODY tag in transitional
HTML has an attribute called "bgcolor", but in Javascript, for whatever
reason, it's called document.bgColor, and names are case-sensitive in
Javascript.

Still, this has nothing to do with any properties that have been set
with CSS. A CSS property for an element is set in Javascript as follows:

var element = ...;
element.style.propertyName = "...";

The name of the CSS background color property in Javascript is
"backgroundColor".

> alert(document.bgcolor);
>
> When run, the value is apparently set because the alert displays
> "red", however the page itself does not change color.

> but in Javascript, for whatever
> reason, it's called document.bgColor, and names are case-sensitive in
> Javascript.

Thanks for that clarification.

"Jukka K. Korpela" <> writes:

> var body = document.getElementsByTagName("body")[0];

That's sort of silly. How many instances of the element type body would
you expect in a HTML document, by the way?

var body = document.body;

is shorter, better supported, usually faster, and part of the
HTMLDocument interface.

(not that I read alt.html, but anyway


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