2. The Web Wizard’s Guide To JavaScript Chapter 9 Applied Web Programming Techniques

3. Chapter Objectives To learn how to use a triple nested loop to generate an interactive table of Web-safe colors To discover how to combine JavaScript with client-side image mapping to enhance the user interface of your Web pages To find out how to detect the visitor’s browser and platform To understand how to change the text displayed in the visitor’s status bar to provide your own content To learn how to create scrolling text in a text field To get a glimpse of how Dynamic HTML and Cascading Style Sheets can boost the power of your JavaScript programming

4. Generating Content with Nested Looping You can use a short group of nested loops to create lengthy and complex tables that include background colors and JavaScript code. When you include quotes within quotes within quotes, you may need to escape the most deeply nested quote using the backslash character.

5. JavaScript and Client-Side Image Mapping By using client-side image maps with JavaScript, you can create novel and compelling user interfaces that involve substantial interactivity. You can use pseudo-URLs and onclick handlers to execute JavaScript code when links and map areas are clicked.

6. Browser Detection Browser detection is often necessary to deliver different content for different browsers and platforms. Browser detection scripts (sniffers) are ideal candidates for placement in external code libraries such as your mylibrary.js file.

7. Text in the Status Bar You can control the text that is displayed in the status bar of visitors’ computers. To avoid interfering with status messages coming from the browser, be sure to place only temporary information in the status bar. An example is a short message that appears when visitors move the mouse over a link.

8. Scrolling Text in a Field Scrolling text in a form field is an economical, low- bandwidth way to attract the attention of visitors to important announcements on your page.

9. What’s Next? Your new skills in JavaScript programming will assist you in creating Dynamic HTML and using authoring environments such as Flash and Director. Dynamic HTML is the combination of JavaScript, HTML 4, and Cascading Style Sheets. Flash and Director are two of many products that use JavaScript or JavaScript-like languages to create interactivity.