how to populate dropdown with dynamic date based on 2 other dropdown boxes

Answer 1

So it seems like only only really need to populate the 3rd listed if the 2nd is selected to standard to the first thing to do is add an if condition in your event listener that is watching for the change of the 2nd list. If non standard empty the 3rd list and you are done. Else if standard do the ajax call to nameRequest.php passing the current value of list 1 as a parameter that. Upon return of the call populate the 3rd list and you are good to go.

As a note you should disable the submit button while waiting for the ajax to populate the 3rd list then reenable when you are done building that list from the returned data.

Answer 2

That is correct the 3rd lists only needs to populate if the 2nd is selected to standard. I think your idea is correct but I am not good in programming so it would be great if you could send me the code... Thank you!