Head Rush Ajax

190

Chapter 3

Using two request objects

With two request objects created and ready for use, you’ll need to change

updateCoffee() to use both request objects, instead of just one. We can

use the rst request object, request1, to send all requests to the rst coffee

maker, and the second request object, request2, to send all requests to the

second coffee maker...

sending requests with two request objects

I think we need to change

sendRequest() before we rewrite

orderCoffee(). Doesn’t sendRequest()

need to be updated to use both

request objects?

Yes, let’s change sendRequest() rst

Let’s change

sendRequest() to accept a request

object as one of the parmeters you send to it—then,

it will use that request object to send the request to

the URL you supply. That way, we don’t have to write

the code that sends a request twice... we’ll just call

sendRequest(), and be sure to send it the request

object we want to use.

function sendRequest(request, url) {

request.onreadystatechange = serveDrink;

request.open(“GET”, url, true);

request.send(null);

}

Make this change to your

veresion of sendRequest(),

in coffee.js.

This is the only addition

you need to make to

sendRequest().

These lines of code now affect

the request object passed in to

sendRequest(). Remember, there isn’t a

single request object anymore.

Both request1 and request2 are set up

with the same callback and connection

parameters. The only thing ...