MACROMEDIA FLEX-GETTING STARTED WITH FLEX Uživatelský manuál stáhnout pdf (Strana 33)

Figure 2-12. The Pownce chat client

can tell you from experience that building this type of chat

application in Ajax is a real hassle. Cross-domain security be-

comes an issue that requires that you proxy all of the requests.

And making lots of HTTP requests can create memory leaks

on some browsers that will leave you banging your head against

the wall trying to fix all of the bugs that may or may not appear

at any given time. Flex gets around these hassles by sitting on

top of the robust and cross-platform Flash Player.

Another excellent example of an online application is the AIR-

based eBay Desktop (http://desktop.ebay.com), shown in Fig-

ure 2-13.

Desktop Applications | 17

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MACROMEDIA FLEX-GETTING STARTED WITH FLEX Uživatelský manuál Strana 33