EpicWebs
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EpicWebs's post in Populate Drop-down List via Another Drop-down List was marked as the answerAn ajax request will make a request to a server side script like a php file.
The php file will do whatever you code it to do.
With an ajax request you could take some user input, pass it to a server side script, do some validation/calculation with it and then return a response.
https://api.jquery.com/jQuery.ajax/
Good luck!