JS全国城市三级联动详解编程语言

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/blog.ytso.com2013/national-cities-three-linkage 
 
var s=["s_province","s_city","s_county"];//三个select的name 
var 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