Flex Vs Ajax
Flex don′t mesh well with the web experience - subtle browser cues like cursors and fonts are reset to the particular application/flash version, links don′t work right, right click doesn′t work right, etc
Flex don′t stream gracefully
Flex invent new UI conventions all over the place
You can′t copy and paste from them - (except from form controls)
Flex don′t work with the back button without hacking
They′re costlier/harder to develop
Flex don′t degrade gracefully.
Flex are slow - macromedia/adobe continues to work on making Flash faster and computers are getting faster, but rendering flash apps can still take longer than web pages.
But perhaps it′s wrong to frame this as a debate between Ajax and Flash - the two combined could create a smooth, intuitive user experience. In the same way that too much Flash is irritating, too much Ajax gets in the way of usability. It′s really all about context and choosing the right tools for the job.
That is the reason
That is in the upcoming the biggest Hotel portal spicyvillage they use mixture of Flex and Ajax where it need without over shooting anything.
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