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Understanding that if someone had JavaScript disabled the site would not work then is there any other reason not to do this?
I am in the design phase of a new site and want to make it easy to change the server code without having to change the UI – just like a form.
This is using Python server side.
One problem, arguably, is that Ajax techniques break the back button.
By making all of your calls to the server Ajax calls, the user loses their ability to ‘go back’ to a previous view. Facebook exemplifies this. Click the back button on Facebook, generally, does not take you to the previous view you were presented with.
In addition, it is more difficult for a user to bookmark their current view of the site. This can make it difficult for them to share what they are seeing with others and can make it difficult to debug problems that users see; rather than just sending you a URL to recreate their problem, they have to figure out the numerous steps they took before they spotted a problem.
Personally, I think the best place for Ajax is for updating small segments of a page. If you have a page that is changing more than, say, 50%, you may want to rethink the sole use of Ajax