July 1998
Intermediate to advanced
1456 pages
65h 5m
English
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Navigator 4 DHTML
As
early as
Navigator 2, JavaScript offered the possibility of altering the
content being delivered to a browser as a page loaded. It was
Navigator 3, however, that showed the first glimpse of what Dynamic
HTML could be. This browser implemented the IMG
HTML element as a document object whose SRC
attribute could be changed on the fly to load an entirely different
image file into the space reserved by the
<IMG> tag. In DHTML parlance, this is known
as a
replaced element because it is rendered as an inline element (capable
of flowing in the middle of a text line), yet its content can be
replaced afterward. The most common application of this replacement
feature is the
mouse rollover, in which an image is
replaced by a highlighted version of that image whenever the user
positions the cursor atop the image. If you surround the
<IMG> tag with a link
(<A>) tag, you can use the link’s
mouse event handlers to set the image
object’s source file when the cursor rolls atop the image and
when it rolls away from the image:
<A HREF="someURL.html"
onMouseOver="document.images['logo'].src = 'images/logoHOT.jpg'"
onMouseOut="document.images['logo'].src = 'images/logoNORMAL.jpg'">
<IMG NAME="logo" SRC="images/logoNORMAL.jpg" HEIGHT=40 WIDTH=80>
</A>At the time, this capability was a breakthrough that allowed dynamic content without the delay of loading a Java applet or rich media for a plug-in. Navigator 3 even allowed JavaScript to pre-cache all images on a page during ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.