Head Rush Ajax

48

Chapter 1

We’re nally ready to code updatePage()... right? Since you’ve set up the

onreadystatechange property of the request object, the web browser will run

updatePage() when the server responds to the request. But something’s still missing...

Getting the server’s response

updatePage()createRequest() getBoardsSold()

I see how we can get the browser to run

updatePage() when the server responds,

but what about the data that the server

responds

with

? How do we get access to

that in updatePage()?

You’ve already seen how to tell the browser to

run the updatePage() function when the

server responds, but the browser—and that

request object you’ve been using—does even

more to help you out.

Once the browser gets a response from

the server, it gures out what to do

next by checking the request object’s

onreadystatechange property. And,

since you’re going to want the data the

server returned, the browser puts that data

in another property of the request object: a

property called responseText.

So any time you want to gure out what the

server returned in its response, just access the

request object’s responseText property.

The browser helps out again

In fact, the browser sets quite a

few properties on the request object

before it runs your JavaScript

function. Stay tuned to nd out

what these other properties do...

a little help from the browser

You can get

the server’s

response

using the

responseT ...