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Figure 1-3
Advantages of Ajax
The advantages of Ajax over classical web based applications are:
Asynchronous
-- Ajax allows for the ability to make asynchronous calls to a web server. This
allows the client browser to avoid waiting for all data to arrive before allowing the user to act
once more.
Minimal data transfer
-- By not performing a full postback and sending all form data to the
server, the network utilization is minimized and quicker operations occur. In sites and locations
with restricted pipes for data transfer, this can greatly improve network performance.
Limited processing on the server
-- With the fact that only the necessary data is sent to the
server, the server is not required to process all form elements. By sending only the necessary
data, there is limited processing on the server. There is no need to process all form elements,
process the viewstate, send images back to the client, and no need to send a full page back to
the client.
Web server and associated backend
services, such as web services.
Web browser client
Data back in
an XML format
or other format
without the
weight of a
postback.
XML data
format in
over HTTP
with no
postback.
Ajax proxy services
6
Chapter 1
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