Creating a Scrolling Navigation Bar Effect with CSS and JavaScript
Welcome to the third part of a four-part series that shows you how to build collapsible navigation bars with CSS and JavaScript. In this part, you'll learn how to combine the functionality of the Prototype and Scriptaculous libraries to construct a pretty useful scrolling navigational bar.
Creating a Scrolling Navigation Bar Effect with CSS and JavaScript - Finishing the dynamic navigation bar (Page 4 of 4 )
Undoubtedly, the best way to see how the different parts that make up this dynamic bar work as expected is to include them all in one single (X)HTML file. So, below I included the definition of this file, to let you examine it in detail:
<!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 an 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 shown above, I coded one (X)HTML file that includes the structural markup of the navigational bar, along with its CSS styles and the JavaScript code required to make it work.
Of course, in this case I can’t directly provide you with a functional example that shows you how the navigation bar scrolls up and down across the web page each time the switcher is clicked on, since it uses the source files of Prototype and Scriptaculous together. The following images, however, should give you some idea of this process is accomplished:
As always, feel free to use all of the code samples included in this tutorial. You can learn more about how it works by introducing your own modifications to this scrolling navigational bar. It’ll be an educational experience, believe me!
Final thoughts
In this third episode of the series, you learned how to combine the functionality of the Prototype and Scriptaculous libraries to construct a pretty useful scrolling navigational bar.
In the final article, I’m going to polish the scrolling effect applied to the previous navigation bar by using another animation that comes bundled with the Scriptaculous framework. Don’t miss it!
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JavaScript 
Finishing a Collapsible Navigation Bar with CSS and JavaScript
