CD-116 Part II . JavaScript Tutorial Due to (Best web hosting)
Friday, July 27th, 2007CD-116 Part II . JavaScript Tutorial Due to different approaches to document object models that Microsoft and Netscape have taken over the years, it is only with adoption of the W3C DOM in the IE5 and NN6 browsers that a lot of the same DHTML script code can run inter changeably on both IE and NN. (But even then, IE5 and IE5.5 do not support the W3C DOM as fully as NN6 does.) If your audience uses IE exclusively, you also have the option of using Microsoft s proprietary object model for compatibility back to IE4 (although with occasional compatibility problems accruing to the Macintosh version of IE4). In Chapter 14, I provide some suggestions on how to approach the diversity of object models when developing content. Until W3C DOM-compatible browsers represent the majority of browsers accessing your pages, you may have to weigh a delicate balance between the gain to your Web site s prestige with very cool DHTML features and the pain in making those features work on a range of incompatible browsers. But even if you sit on the DHTML sidelines for a while, there is plenty to do with fully compatible scripting techniques demonstrated throughout this tutorial. And so ends the final lesson of the JavaScript Bible, Fourth Edition tutorial. If you have gone through every lesson and tried your hand at the exercises, you are now ready to dive into the rest of the book to learn the fine details and many more fea tures of both the document object model and the JavaScript language. You can work sequentially through the chapters of Parts III and IV, but before too long, you should also take a peek at Chapter 45 to learn some debugging techniques that help the learning process. Exercises 1. Explain the difference between a document image object and the memory type of image object. 2. Write the JavaScript statements needed to precache an image named jane.jpg that later will be used to replace the document image defined by the following HTML: 
3. With the help of the code you wrote for Question 2, write the JavaScript statement that replaces the document image with the memory image. 4. Backward-compatible document image objects do not have event handlers for mouse events. How do you trigger scripts needed to swap images for mouse rollovers? …
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