全国城市三级联动
不是数据库的,从js文件读取
如果要找数据库的,本站有好几个了,这里推荐一个《ajax php mysql无限级联菜单 联动菜单 二级联动 三级联动菜单》

XML/HTML Code
- <select id="s_province" name="s_province"></select>
- <select id="s_city" name="s_city" ></select>
- <select id="s_county" name="s_county"></select>
- <script class="resources library" src="area.js" type="text/javascript"></script>
- <script type="text/javascript">_init_area();</script>
JavaScript Code
- <script type="text/javascript">
- var Gid = document.getElementById ;
- var showArea = function(){
- Gid('show').innerHTML = "<h3>省" + Gid('s_province').value + " - 市" +
- Gid('s_city').value + " - 县/区" +
- Gid('s_county').value + "</h3>"
- }
- Gid('s_county').setAttribute('onchange','showArea()');
- </script>
原文地址:http://www.freejs.net/article_biaodan_429.html