Sams Teach Yourself JavaScript in 24 Hours
- Table of Contents
- Copyright
- About the Author
- Acknowledgments
- We Want to Hear from You!
- Reader Services
- Introduction
- Part I: Getting Started
- Hour 1. Understanding JavaScript
- Hour 2. Creating a Simple Script
- Hour 3. How JavaScript Programs Work
- Part II: Learning JavaScript Basics
- Hour 4. Using Functions and Variables
- Hour 5. Using Strings and Arrays
- Hour 6. Testing and Comparing Values
- Hour 7. Repeating Yourself: Using Loops
- Hour 8. Using Math and Date Functions
- Part III: The Document Object Model (DOM)
- Hour 9. Working with the Document Object Model
- Hour 10. Responding to Events
- Hour 11. Using Windows and Frames
- Hour 12. Getting Data with Forms
- Hour 13. Using Graphics and Animation
- Part IV: Moving on to Advanced JavaScript Features
- Hour 14. Creating Cross-Browser Scripts
- Hour 15. Creating Custom Objects
- Hour 16. Working with Sounds and Plug-Ins
- Hour 17. Debugging JavaScript Applications
- Part V: Working with Dynamic HTML (DHTML)
- Hour 18. Working with Style Sheets
- Hour 19. Using Dynamic HTML (DHTML)
- Hour 20. Using Advanced DOM Features
- Part VI: Putting It All Together
- Hour 21. Improving a Web Page with JavaScript
- Hour 22. Creating a JavaScript Game
- Hour 23. Creating DHTML Applications
- Hour 24. JavaScript Tips and Tricks
- Part VII: Appendices
- Appendix A. Other JavaScript Resources
- Appendix B. Tools for JavaScript Developers
- Appendix C. Glossary
- Appendix D. JavaScript Quick Reference
- Appendix E. DOM Quick Reference
Q&A
| Q1: |
I created an onMouseOver event handler for rollovers, and it works in Internet Explorer but not Netscape. What's wrong? |
| A1: |
This is probably because you used the onMouseOver handler in the <img> tag. This is supported only by Internet Explorer. For Netscape, you need to make the image a link and use event handlers in the <a> tag. (This will also work in Internet Explorer.) |
| Q2: |
Can I use rollovers in an image map? |
| A2: |
No, you'll need to replace the entire map image to do this. Usually, it's easier and faster to divide the map image into a number of sections and use those as the rollovers. |
| Q3: |
JavaScript animation seems a bit basic. Is there a way to do more complex or interactive animation? |
| A3: |
Not in JavaScript. For these purposes, you may want to look into using Java or Macromedia's Flash. See this URL for more information about Flash: http://www.macromedia.com/software/flash/. |
| Q4: |
I created a JavaScript program on a page with images, and my event handlers don't seem to be working. What's wrong? |
| A4: |
JavaScript requires you to use HEIGHT and WIDTH attributes on all <img> tags. Adding them will most likely make the event handlers work properly. See Hour 17, "Debugging JavaScript Applications," for other debugging techniques. |
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