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problems and patterns using AJAX

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With AJAX, there is a need to use javascript to perform a little bit of your "logic" apart from the usual "presentation" changes that we are used to doing using DHTML. Previously the trend was to keep only presentation related information on the generated web page, but now with AJAX some of the server-side logic needs to be part of the generated web page. Doesn't it make web development a little more difficult? Does the book give techniques/patterns to use when developing using AJAX?

No doubt we are achieving a richer web experience for the user, but there seems to be some new problems that arise when adopting AJAX. Searching the net I see that there appears to be solutions to the commonly raised questions like the "Back Button" issue. An article on the Sun site talks about the problems that may arise due to "viewable source", problems like security concerns and plagiarism. Ryan/Nathaniel, could you'll please comment on the same?

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