如何设置选择框或下拉列表框的值，因为前一个列表框值已设置[重复]

Question

Possible Duplicate:
Use jquery to change second select list based on first select list option

I've got two select elements in my code. One for states (#us_state) and second for cities (#city_name). When I choose a "state" the second select element must contain only that cities which exists in selected state.

Answer 1

use jquery append to append the option values (also remember to clear the options outside the iterating loop using

$('#city_name').html("");

$('#city_name').append('<option value="'+city+'">'+city+'</option>');