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Dynamic Content
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HTML: A Beginner s Guide
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hile HTML enables you to create static, or unchanging, web pages, JavaScript extends the capabilities of HTML, enabling you to create dynamic pages, which either change or react to users input The combination of JavaScript and Cascading Style Sheets (CSS) gives us what s commonly called Dynamic HTML or DHTML This section is not meant to teach you to be a web programmer, but rather to help you use it in simple formats in your pages To that end, this chapter gives a brief introduction into the how and why of JavaScript and DHTML, and then focuses on the presentation of a few typical examples of using dynamic content in a web page If this whets your appetite for basic web scripting and you want to learn more, don t miss the great additional resources listed at the end of the chapter
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Contrary to what its name implies, JavaScript is not the same as Java Sun Microsystems created the Java programming language, while Netscape developed JavaScript Unlike Java, which can run on its own as a mini-application, JavaScript is built into web browsers and cannot stand on its own Essentially, it s just a set of statements, or scripts, that are instructions for the browser
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JavaScript is not supported by all web browsers In addition, users can turn off support for JavaScript from within their personal browser This means you should use caution when relying on JavaScript to transfer important information to users
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When you write JavaScript, it s actually placed right within the HTML on your page This means you can learn JavaScript from your favorite web sites, just as you can with HTML, by viewing the HTML source from within the browser But, before you can do that, you have to know what JavaScript looks like and where to look for it The following is a basic example:
<html> <head> <title>My Web Page</title> <script language= "JavaScript" type= "text/javascript"> documentwrite("I can write JavaScript!"); </script> </head> <body> </body> </html>
16: Dynamic Content
The opening and closing script tags are HTML, while everything in between them is written in JavaScript This is an important distinction because JavaScript is quite different than HTML in several ways:
JavaScript is case-sensitive; some forms of HTML are not In JavaScript, quotes are required; in some forms of HTML, quotes are optional JavaScript has a distinct format that must be adhered to; most forms of HTML are forgiving about spacing and formatting JavaScript is considered to be a programming language, whereas HTML is called a markup language
Given those restrictions, troubleshooting JavaScript can be a bit tricky Whenever you copy a script from a web site or a book, be sure to copy it exactly as it is written, unless otherwise specified For example, placing a line break in the middle of the previous example could produce an error when the page is viewed in a browser
<script language="JavaScript" type="text/javascript"> documentwrite("I can write JavaScript! "); This misplaced line break can </script> cause browsers to display an
Troubleshoot JavaScript
error when the page is viewed
If you have a copy of a Mozilla-based browser, such as Firefox, you have a great way to troubleshoot your JavaScript Choose Tools | Error Console to display any error information associated with recent web browsing (If you ve visited any web sites recently, chances are good you ll see plenty of errors, as I did when I took this screen capture!)
HTML: A Beginner s Guide
You can use this console to view errors on your pages or even to test strings of code, by typing them into the console and clicking Evaluate If you re using Internet Explorer, you ve probably seen a small warning icon display in the bottom-left corner of the browser at one time or another This occurs when a page displays with errors in Internet Explorer (You may even see a statement such as Done, but with errors on page along the bottom edge of the browser window) Click the icon to the left of the statement to reveal information about the error(s)
Firefox users can download a great add-on called Firebug from https://addons mozillaorg/en-US/firefox/addon/1843 This popular tool allows you to edit, view, and troubleshoot not only JavaScript, but also CSS and HTML in live web pages
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