Often, countries and cities are arranged in hierarchical ways. This means that we need two or more select elements to pin down a user birth place, for example. In this paragraph, we will explore a little bit of hierarchical selection with multiple drop-down menus. Since there are too many cities in the world, I will use a biological equivalent and we will select from animals:
clans: { mammalia: { 'have fingers': { human: 'human', chimpanzee: 'chimpanzee' }, 'fingerless': { cat: 'cat', bear: 'bear' } }, birds: { flying: { eagle: 'eagle', pidgeon: 'pidgeon' }, 'non flying': { chicken: 'chicken' } } }
We will call the top level a clan, the second level a type and the last will be an animal. I know it's an ...
