Head Rush Ajax

208

Chapter 4

Alright, I’m psyched! I want to learn

more about the DOM. So where can I

nd out how to use this thing?

Better visit your local tree farm...

Using the DOM without Ajax

Since the Document Object Model isn’t tied to your asynchronous

programming, there’s nothing preventing you from using the DOM

in all your web applications. In fact, we’re going to prove it to you...

The Great Chapter 4 Coding Challenge

Write a killer web application that uses the

Document Object Model to create a dynamic

user interface, without writing any Ajax code.

If you can pull this off, then you’ll know

that you can use the DOM to make all

your applications better, even if they

aren’t making asynchronous requests.

the coding challenge

you’re on your way �

209

the document object model

Mike: Oh, you’re in exactly the right place. I can help

you with the Document Object Model. In fact, we get a

lot of requests for that around here.

Jenny: Huh? Maybe you don’t understand... I’m

talking about programming web pages. All you seem to

have is a bunch of trees.

Mike: That’s right. Trees are exactly what you want.

Jenny: Maybe I’m not being clear here. I want to

program web pages, and change the way a page looks

using JavaScript. What does that have to do with trees?

Mike: Every web page is, in fact, a tree.

Jenny: Is this ...