Ajax can it make a site difficult to use?

Ajax itself raises at least one problem, which is that the back button can not function sometimes. Moreover, since it involves JavaScript, functions of the page will be neutralized if JavaScript is disabled, but it is a disadvantage of a general nature.
The webmaster must weigh the benefits of the asynchronous mode, and these disadvantages to choose whether to use Ajax.

User benefits

Ajax makes the interaction with the server smooth thanks to the asynchronous mode: it is possible to load data without reloading the page.
So a Web application runs as a local application.

Disadvantages for the user

• The back button may become inoperative. Some frameworks solve this problem.
• If JavaScript is disabled, dynamic functions are too.
• Some older browsers (very old) do not recognize the XMLHttpRequest object, which is essential for interacting with the server.
• If the server is too slow to respond, this may confuse the user, it is a problem that the webmaster should take into account in the design of the page.
• The user can not bookmark a dynamically loaded content.
• He can not share the address of that content.

Conclusion

Ajax must be used wisely and not systematically. Dynamic content should represent a small portion of the page and preferably some purely aesthetic elements.