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If you haven't got javascript available then it's a no-brainer that you need a button/link of some type to submit a hierarchy of selected options to the same web page. At the top of the page you get from the db the options according to the already selected options for each select (or default options for the first select if none selected) and output them in the html. You don't have any other choices in principle afaik if you need to support browsers without javascript.
Once a selection has been made in each chained select, do your your normal processing for the form data.
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