you’re on your way 4
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asynchronous applications
JavaScript
PHP script
HTML form
The back-and-forth of Ajax development
In Chapters 1 and 2, you were able to start working on an application and
develop it piece by piece until you were done. In this chapter, we’re going to
have to go back and forth a bit between the three parts of the coffee maker
app. This is called iterative development, because you keep working on
the same pieces over and over.
You’ll see this graphic at the top of
most of the pages in this chapter. It
will remind you which part of the coffee
maker app we’re working on.
The part of the app we’re
focusing on will be pulled
out, and the arrow will
point to that part, too.
Most applications
are developed
iteratively: you
keep coming back
to things you’ve
already worked
on, and adding
to and improving
them.
Even when we start working
on the JavaScript or PHP,
we’ll still have to come back
to the HTML to make
improvements or changes.