Finishing a Collapsible Navigation Bar with CSS and JavaScript
Welcome to the final tutorial of a series on building a dynamic navigation bar with CSS and JavaScript. This series of articles steps you through the development of a dynamic navigational system. We use the combined functionality of the popular Prototype and Scriptaculous JavaScript libraries, without compromising overall accessibility.
Finishing a Collapsible Navigation Bar with CSS and JavaScript - The scrollable bar’s structural markup (Page 2 of 4 )
We'll start our demonstration of how to polish the scrolling effect of this navigational bar by recalling briefly how its structural markup looks. In doing so, you’ll be able to grasp more easily how this static web-based user interface can be easily animated with only a pinch of JavaScript code.
Having said that, here’s the basic markup of a sample web document that includes the pertaining navigation bar, along with a few other sections, including a main area and a footer as well:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Example on building a dynamic navigation bar</title>
<h2>This is the navigation bar of the web page</h2>
<ul>
<li><a href="#">Link 1</a></li>
<li><a href="#">Link 2</a></li>
<li><a href="#">Link 3</a></li>
<li><a href="#">Link 4</a></li>
<li><a href="#">Link 5</a></li>
<li><a href="#">Link 6</a></li>
</ul>
</div>
<div id="maincol">
<div id="switcher">Turn on/off navbar</div>
<h2>This is the center column of the web page</h2>
<p>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Maecenas enim. Nulla facilisi. Vestibulum accumsan augue vulputate justo. Fusce faucibus. Sed blandit, neque sed lacinia nonummy, diam quam imperdiet justo, at dictum augue nunc a neque. Sed urna lacus, tincidunt at, aliquam id, fringilla id, felis. Vivamus feugiat molestie quam. Sed id dolor. Sed ac purus id sapien </p>
<p>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Maecenas enim. Nulla facilisi. Vestibulum accumsan augue vulputate justo. Fusce faucibus. Sed blandit, neque sed lacinia nonummy, diam quam imperdiet justo, at dictum augue nunc a neque. Sed urna lacus, tincidunt at, aliquam id, fringilla id, felis. Vivamus feugiat molestie quam. Sed id dolor. Sed ac purus id sapien </p>
<p>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Maecenas enim. Nulla facilisi. Vestibulum accumsan augue vulputate justo. Fusce faucibus. Sed blandit, neque sed lacinia nonummy, diam quam imperdiet justo, at dictum augue nunc a neque. Sed urna lacus, tincidunt at, aliquam id, fringilla id, felis. Vivamus feugiat molestie quam. Sed id dolor. Sed ac purus id sapien </p>
</div>
<div id="footer">
<h2>This is the footer section of the web page</h2>
<p>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Maecenas enim. Nulla facilisi. Vestibulum accumsan augue vulputate justo. Fusce faucibus. Sed blandit, neque sed lacinia nonummy, diam quam imperdiet justo, at dictum augue nunc a neque. Sed urna lacus, tincidunt at, aliquam id, fringilla id, felis. Vivamus feugiat molestie quam. Sed id dolor. Sed ac purus id sapien </p>
<p>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Maecenas enim. Nulla facilisi. Vestibulum accumsan augue vulputate justo. Fusce faucibus. Sed blandit, neque sed lacinia nonummy, diam quam imperdiet justo, at dictum augue nunc a neque. Sed urna lacus, tincidunt at, aliquam id, fringilla id, felis. Vivamus feugiat molestie quam. Sed id dolor. Sed ac purus id sapien </p>
<p>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Maecenas enim. Nulla facilisi. Vestibulum accumsan augue vulputate justo. Fusce faucibus. Sed blandit, neque sed lacinia nonummy, diam quam imperdiet justo, at dictum augue nunc a neque. Sed urna lacus, tincidunt at, aliquam id, fringilla id, felis. Vivamus feugiat molestie quam. Sed id dolor. Sed ac purus id sapien </p>
</div>
</body>
</html>
As illustrated before, the above (X)HTML file contains a rudimentary navigation bar, which is made up simply of a group of links wrapped by a list. Then, there’s a main content area, and finally a footer section, as you’ve probably seen hundreds of times before.
Since the structure of the previous web file is extremely simple and doesn’t bear much discussion here, it’s time to see how to turn the previous navigational bar into a scrollable web page element, this time removing the glitches that I mentioned in the introduction.
To learn how this will be achieved, click on the link below and read the following segment.
JavaScript 
Creating a Scrolling Navigation Bar Effect with CSS and JavaScript
