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if statement

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Feb 19.2005

Hello!

I’ve picked up this code from the book:

[code]
<html>
<head>
<script language = “javascript”>
[COLOR=limegreen]if (document.images)[/COLOR]
{
image1 = new Image
image2 = new Image
image1.src = “my secondimage.gif”
image2.src = “myfirstimage.gif”
}
else
{
image1 =””
image2 =””
}

</script>
</head>

</html>

[/code]

The text that is highlighted I don’t understand quite well.
That means if document.images are true, equals to zero, or equals to
one? document.images I don’t see that images was declared anywhere in the code.
This is something related to rollover. There is some code that goes in the body text which I understand pretty well.

Thanks.

to post a comment
JavaScript

3 Comments(s) ↴

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@PittimannFeb 19.2005 — Hi!

document.images is an array containing the image objects of a document. Most browsers use this array. The if statement checks the availability of that array (and thus, to make it simple: the browser's capability to deal with images at all). So, if the array is there, do some stuff, if not, do other stuff.

Cheers - Pit
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@barimauthorFeb 19.2005 — So, that means that there are some browsers that are incapable of handling images at all? I would like to know what type of browswers cannot handle images? I wonder if such broswers exist at all.

If you could provide me this information, so I can see usefulness of this if statement.

Thanks a lot.
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@JPnycFeb 19.2005 — Type "text only browsers" or "non-graphical" browsers into any search engine.
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