September 2001
Intermediate to advanced
640 pages
31h 42m
English
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Creating Layers
Dynamically positioned objects in DHTML are often referred to as
layers, probably because they work like the layers used in many
graphics programs, such as Adobe Photoshop. A
layer
is a container for content that can be
positioned in the x (horizontal), y (vertical), and z (stacking
order) dimensions. A typical layer is created with a
<div> tag surrounding other HTML elements,
as shown in Example 29-2. Special attributes in the
<div> tag define its behavior. Once
you’ve created a layer, you can show and hide it, animate it,
or change its appearance in other ways. (Note that this example
simply demonstrates creating a layer, not manipulating it in any way;
we’ll see examples of that shortly.)
Example 29-2. Defining a Simple Layer
<html>
<head>
<style type="text/css">
<!--
.welcome { font-family: Geneva, Arial, Helvetica, san-serif;
font-size: large;
font-style: oblique;}
-->
</style>
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div id="Layer1" (A)
style="position:absolute; (B)
z-index:1; (C)
left:100px; top:10px; (D)
width:300px; height:60px; (E)
background-color: #FFCC00;"> (F)
<p align="center" class="welcome">Welcome To Jen's World!</p>
</div>
</body>
</html>- (A)
This line specifies an
idfor the<div>, so that we can manipulate it later with JavaScript.
- (B)
With the
styleattribute, we specify a number of CSS properties for the<div>. First, we make the layer a positionable object by setting thepositionproperty. The possible values forpositionareabsolute ...
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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.