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About AJAX...
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Microsoft
has a complicated relationship with Ajax.
On the one hand, the company wants
to
provide its existing ASP.NET developers with an easy way to implement Ajax functionality
without
having to learn JavaScript. On the other hand, Microsoft recognizes that the
future is
on the client. Therefore, it wants to provide web developers with the tools
they
need to
build pure client-side Ajax
applications. For these reasons, Microsoft has both a
server-side
Ajax framework and a client-side Ajax framework.
If you want
to retrofit an existing ASP.NET application to take advantage of Ajax, you can
take
advantage of Microsoft’s server-side Ajax
framework. To take advantage of the serverside
framework,
you don’t need to write a single line of JavaScript code. You can continue
to build
ASP.NET pages with server-side controls in the standard way. You learn how to
take
advantage of the server-side Ajax
framework in this chapter.
The
advantage of the server-side framework is that it provides existing ASP.NET
developers
with a
painless method of doing Ajax.
The disadvantage of the server-side framework is
that it
doesn’t escape all the problems associated with a server-side framework. You
still
have to
run back to the server whenever you perform any client-side action.
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