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copied!<p>To confirm what others have said, disabling Javascript will also disable the AJAX call. After all, AJAX stands for "Asynchronous Javascript and XML".</p> <hr> <p>To address why you can't just use PHP, there are some things that just can't be done without it. PHP is great to load the page with the initial information, but after the page is loaded, it actually requires the page to be reloaded to load something else. AJAX allows you to get around this hassle.</p> <p>For your example of form validation, AJAX can be used to validate the information while the person is filling it out. Otherwise, you are required to reload the page each time someone fills out another field in the form.</p> <p>Another example is from a project that I have worked on. The form required a zip code and would load the appropriate city and county based on the inputted zip. Using strict PHP, I would need the client to download the entire zip table embedded in the HTML/JS (which would add another 100k at least to the download).</p> <p>Using AJAX, I can get around this. The user can input the zip code, which triggers an AJAX call that downloads the few rows that I need (this will be less than a few hundred bytes, for comparison).</p> <p>[Edit:] Also, a tip because you said that you were new to AJAX. If your dealing with some form of authentication (logging in, etc.), remember to validate the user on the AJAX pages themselves. Otherwise, tricky users will be able to access sensitive information for your database.</p>

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