Head Rush Ajax

46

Chapter 1

Remember, we’ve got to tell the browser what to do with the server’s

response to our request before we make the request... because once

the request is made, getBoardsSold() nishes running, and our

JavaScript code won’t know what’s going on with the request. Fortunately,

the request object we’ve been using has a property just for this purpose:

If you put the name of a

function here, the browser will

run that function when it gets

a response from the server.

function getBoardsSold() {

createRequest();

var url = “getUpdatedBoardSales-ajax.php”;

request.open(“GET”, url, true);

request.onreadystatechange = updatePage;

request.send(null);

}

Sending instructions to the browser

Be sure you set this

property before you call

send(), or this function

won’t get run.

updatePage()createRequest() getBoardsSold()

Time to go back to

getBoardsSold(), now that

we’ve learned a little more

about web browsers.

So how do we talk to the browser? So far,

all the code we’ve written just deals with

that JavaScript request object. Wait a

second... that’s it! Can we use the request

object to talk to the browser?

who has the server’s response?

JavaScript requires that you

leave off the parentheses on

the function name here.

you’re on your way 4

47

Q:

The server talks to the browser, the browser

talks to the Ja ...