I am trying to adapt a code to convert my page to an amp but I can not get it, it is an internet example that consists in loading a selection field through the value of another field. I show a link from the example I saw.
what it does is load the second select depending on the value of first, well what I want is to load by default the two select if there are the variables of country or country and city.
Another thing that I would like to know if it is possible and how it is done, fill the second select but accessing a database and recover only what is needed in the json.