任何已经可以处理多个选择框中的多个选择的现有脚本或库？

I am trying to create a search function where there are 3 select boxes ( tags) which are a) Country b) Region c) City. When you select a country (e.g. Australia), the region select box will be filled with regions from Australia. (e.g. Queensland, Tasmania, and etc.)I am trying to create a search function where t