September 2001
Intermediate to advanced
640 pages
31h 42m
English
Content preview from Web Design in a Nutshell, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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How DHTML Works
As I mentioned earlier, DHTML is a combination of HTML, Cascading
Style Sheets, JavaScript, and the Document Object Model. Example 29-1 illustrates how these elements work together.
The web page shown here uses simple DHTML to change the style of
links to be red and underlined when the mouse is rolled over them.
You can use this basic format to tie CSS styles to common events like
onMouseOver or OnClick, so you
can change the styles of most elements on the fly.
Example 29-1. Rollover style changes using DHTML
<html> (A) <head> <title>Rollover Style Changes</title> <style> (B) <!-- a { text-decoration: none; } --> </style> <script> (C) <!-- function turnOn(currentLink) { currentLink.style.color = "#990000"; (D) currentLink.style.textDecoration = "underline"; } function turnOff(currentLink) { currentLink.style.color = "#0000FF"; currentLink.style.textDecoration = "none"; } //--> </script> </head> <body bgcolor="#FFFFFF"> <a href="#home" (E) onMouseOver="turnOn(this);" onMouseOut="turnOff(this);">Home</a> <a href="#contact" onMouseOver="turnOn(this);" onMouseOut="turnOff(this);">Contact</a> <a href="#links" onMouseOver="turnOn(this);" onMouseOut="turnOff(this);">Links</a> </body> </html>
- (A)
This page is an HTML file, so it starts with normal
<html>and<head>HTML tags.
- (B)
In the
<head>, we have a CSS style sheet, defined using the<style>tag, that removes any text decorations from all the links in the document. In this case, the point is to remove the default underlines ...
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