Head Rush Ajax

30

Chapter 1

All right! You’ve got a request object, a URL, and your connection

is initialized and ready to go. Now you just need to make the

connection, and request the updated number of boards sold. To

do that, just call send() on the request object:

function getBoardsSold() {

createRequest();

var url = “getUpdatedBoardSales-ajax.php”;

request.open(“GET”, url, true);

request.send(null);

}

You’re sending the

request here...

...and this means that you’re not sending

any data in the request. The script

doesn’t need any data; it just returns

the total board sales, every time it’s run.

In this particular app, you don’t need to provide

the server with any information. Each request to

the PHP script asks for the same thing: a single

number, the total number of boards that Katie

has sold. So you don’t need to send the server

anything but null in your request.

The server doesn’t need any data.

Are you kidding me? We did all this work,

and you’re telling me I’m sending null to

the server? This is what you call next-

generation programming?

Connecting to the web server

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.

Here’s our checklist from page

28... only one item left to go.

We’re working on this last task now. ...