About the DOM document object

[Draenox]

In an if statement with "document.images" as it's expression, does it
simply check if there are any image elements in an HTML page? I'm
assuming if it finds any that the expression will return true and
execute the statements within the if.

if(document.images)
{
// various statements....
}

[Evertjan.]

Dr*****@gmail.com wrote on 29 mrt 2007 in comp.lang.javascript:

In an if statement with "document.images" as it's expression, does it
simply check if there are any image elements in an HTML page? I'm
assuming if it finds any that the expression will return true and
execute the statements within the if.

if(document.images)
{
// various statements....
}

No, not true, try:

<script type='text/javascript'>

if (document.images) alert(document.images);

</script>

This returns [object] even if there are no img elemants.

(document.images) only equates to false if the object is not part of the
DOM of that browser, or if no DOM exists [in a non browser environment,
methinks].
--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

[Lee]

Dr*****@gmail.com said:

>
In an if statement with "document.images" as it's expression, does it
simply check if there are any image elements in an HTML page? I'm
assuming if it finds any that the expression will return true and
execute the statements within the if.

if(document.images)
{
// various statements....
}

No, there don't have to be any images on the page for document.images
to evaluate to true. The browser simply has to support images (and in
some cases, images may have to be enabled).
--

[Tom Cole]

On Mar 29, 3:49 pm, Lee <[e-mail]:

[e-mail] said:

In an if statement with "document.images" as it's expression, does it
simply check if there are any image elements in an HTML page? I'm
assuming if it finds any that the expression will return true and
execute the statements within the if.

if(document.images)
{
// various statements....
}

No, there don't have to be any images on the page for document.images
to evaluate to true. The browser simply has to support images (and in
some cases, images may have to be enabled).

--

You can call document.images.length and if it returns 0 then there are
no images, if it returns >= 1 then there are.

if (document.images.length 0) {
//do image stuff
}
else {
//do no image stuff
}

[=?ISO-8859-1?Q?Une_B=E9v?==?ISO-8859-1?Q?ue?=]

Tom Cole <tc****@gmail.comwrote:

>
You can call document.images.length and if it returns 0 then there are
no images, if it returns >= 1 then there are.

Are you sure about that ?

Because i thought in case images are only included by css, ie. :

myTag {background-image: url(<URL of an image>;}

that kind of image isn't seen by document.images ???
--
Une Bévue

[Tom Cole]

On Mar 30, 9:11 am, [e-mail] (Une
Bévue) wrote:

Tom Cole <[e-mail]:

You can call document.images.length and if it returns 0 then there are
no images, if it returns >= 1 then there are.

Are you sure about that ?

Because i thought in case images are only included by css, ie. :

myTag {background-image: url(<URL of an image>;}

that kind of image isn't seen by document.images ???
--
Une Bévue

Maybe I'm weird, but I wouldn't expect them to. I would expect to get
a array of <imgtags...the same as calling
document.getElementsByTagName('IMG').

I was unaware that the OP was looking for something different. He said
he was looking for image elements....

[Randy Webb]

Tom Cole said the following on 3/30/2007 11:41 AM:

On Mar 30, 9:11 am, [e-mail] (Une
Bévue) wrote:

>Tom Cole <[e-mail]:

>>You can call document.images.length and if it returns 0 then there are
no images, if it returns >= 1 then there are.

Are you sure about that ?

Because i thought in case images are only included by css, ie. :

myTag {background-image: url(<URL of an image>;}

that kind of image isn't seen by document.images ???
--
Une Bévue

Maybe I'm weird, but I wouldn't expect them to.

It doesn't.

I would expect to get a array of <imgtags...the same as calling
document.getElementsByTagName('IMG').

Pretty much what it gives when you do something like:

allImages = document.images;

I was unaware that the OP was looking for something different. He said
he was looking for image elements....

No, he was asking for clarification of what the posted code did.

--
Randy
Chance Favors The Prepared Mind
comp.lang.javascript FAQ - http://jibbering.com/faq/index.html
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[Patient Guy]

"Dr*****@gmail.com" <Dr*****@gmail.comwrote in comp.lang.javascript:

In an if statement with "document.images" as it's expression, does it
simply check if there are any image elements in an HTML page? I'm
assuming if it finds any that the expression will return true and
execute the statements within the if.

if(document.images)
{
// various statements....
}

Since the 'images' property is an array ("collection"?), I would guess that
if you really wanted to find a condition in which there are images truly in
the document, why not evaluate: if (document.images.length 0)