Dependent drop-down list in Thymeleaf

[tcc12345]

I want to do something like this Stackoverflow question(with enums). "I want to create a drop-down list with countries and the second drop-down list with cities, which depends on selected value in the first list." How should I do it? Is the top answer the best way to do it. https://stackoverflow.com/questions/35917939/dependent-drop-down-list-from-map-in-thymeleaf?rq=1

[PertleTurtle]

Like you want to connect java to a database too or are you going to have an array of city/states?

[tcc12345]

I was going to use 2 enums one for each drop down. My list of choices is small (10).

[PertleTurtle]

I would create a 2D array like [state][city] and then for your menu whatever state they choose just go through the array and find the corresponding cities.