JS全国城市三级联动

HTML

<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="js/area.js" type="text/javascript"></script><script type="text/javascript">_init_area();</script>

JS

/**   全国三级城市联动 js版*/function Dsy(){    this.Items = {};}Dsy.prototype.add = function(id,iArray){    this.Items[id] = iArray;}Dsy.prototype.Exists = function(id){    if(typeof(this.Items[id]) == "undefined") return false;    return true;}function change(v){    var str="0";    for(i=0;i<v;i++){        str+=("_"+(document.getElementById(s[i]).selectedIndex-1));    };    var ss=document.getElementById(s[v]);    with(ss){        length = 0;        options[0]=new Option(opt0[v],opt0[v]);        if(v && document.getElementById(s[v-1]).selectedIndex>0 || !v){            if(dsy.Exists(str)){                ar = dsy.Items[str];                for(i=0;i<ar.length;i++){                    options[length]=new Option(ar[i],ar[i]);                }//end for                if(v){ options[0].selected = true; }            }        }//end if v        if(++v<s.length){change(v);}    }//End with}var dsy = new Dsy();dsy.add("0",["北京市","天津市","上海市","重庆市","河北省","山西省","内蒙古","辽宁省","吉林省"]);dsy.add("0_0_0",["东城区","西城区","崇文区","宣武区","朝阳区","丰台区","石景山区","海淀区"]);dsy.add("0_0",["北京市"]);dsy.add("0_1_0",["和平区","河东区","河西区","南开区","河北区","红桥区","塘沽区","汉沽区"]);dsy.add("0_1",["天津市"]);dsy.add("0_2_0",["黄浦区","卢湾区","徐汇区","长宁区","静安区","普陀区","闸北区","虹口区"]);dsy.add("0_2",["上海市"]);dsy.add("0_3_0",["渝中区","大渡口区","江北区","沙坪坝区","开县","彭水苗族土家族自治县"]);dsy.add("0_3",["重庆市"]);dsy.add("0_4_0",["长安区","桥东区","桥西区","新华区","裕华区","赞皇镇","无极县","无极镇"]);dsy.add("0_33",["台北","高雄","台中","花莲","基隆","嘉义","金门","连江"]);dsy.add("0",["北京市","天津市","上海市","重庆市","河北省","云南省","西藏"]);//此处省略... 完整内容请参见Github的代码：https://github.com/itmyhome2013/national-cities-three-linkagevar s=["s_province","s_city","s_county"];//三个select的namevar opt0 = ["省份","地级市","区县"];//初始值function _init_area(){  //初始化函数    for(i=0;i<s.length-1;i++){      document.getElementById(s[i]).onchange=new Function("change("+(i+1)+")");    }    change(0);}

在线演示：national-cities-three-linkage

完整源码：click