Head Rush Ajax

28

Chapter 1

So how’s it coming? Are we any

closer to getting my web report

back online? I’d love to know how

many boards I’ve sold.

Set up the request object to make a connection.

Request an updated number of boards sold.

Figure out what URL you need to connect to so

you can get updated board sales.

Create a new request object by calling the

createRequest() function.

Remember our checklist for getBoardsSold()?

You’re making pretty good progress in your code. Why

don’t you check off what you’ve got done?

updatePage()createRequest() getBoardsSold()

making requests with javascript instead of html

you’re on your way 4

29

next generation applications

Did you pair up the happy couples? Make sure you got all of these right,

and if not, take your time and gure out what you missed, and why.

var request = new XMLHttpRequest();

The Great Code-Comment Coupling Contest

request.open(“POST”, url, true);

var url = “/servlet/GetMileageServlet”;

request.open(“GET”, url, false);

/* Initialize an asynchronous connection using POST */

/* Initialize a synchronous connection using GET */

/* Create a new variable and assign it the URL to a Java servlet */

/* Create a new object to talk HTTP to a web server */

Meet the Happy Couples...

When this is false, the

request will be synchronous...

...and when it’s true, the

request is ...