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In this case we see characters from the greatest
television show ever, Babylon 5 (don??™t bother arguing, you know I??™m right! And besides, you??™ll
get your chance to put in your favorites later!). Now let??™s see how this ???magic??? is accomplished.
Listing 1-1 shows the first page of our simple Ajax example, which performs a fairly typical
Ajax-type function: populate one box based on the selection made in another. This
comes up all the time in web development, and the ???classic??? way of doing it is to submit a
form, whether by virtue of a button the user has to click or by a JavaScript event handler, to the
server and let it render the page anew with the updated contents for the second .
With Ajax, none of that is necessary.
CHAPTER 1 n AN INTRODUCTION TO AJAX, RPC, AND MODERN RIAS 27
Figure 1-14. Note that there is no content in the second drop-down menu because nothing has yet
been selected in the first.
Figure 1-15. A selection has been made in the first drop-down menu, and the contents of the
second have been dynamically created from what was returned by the ???server.???
CHAPTER 1 n AN INTRODUCTION TO AJAX, RPC, AND MODERN RIAS 28
A Quick Postmortem
Let??™s walk through the code and see what is going on.


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