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JavaScript-省市县三级联动菜单

2013-03-13 15:02 197 查看
<html>
<head>
<title>省市县三级联动菜单</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style>
body,select { font-size:9pt; font-family:Verdana; }
a { color:red; text-decoration:none; }
a:hover{ text-decoration:underline; }
</style>

<SCRIPT LANGUAGE="JavaScript">
<!--
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]);
if(v)options[1].selected = true;
}
}

if(++v<s.length){
change(v);
}
}
}

var dsy = new Dsy();
dsy.add("0",["北京","安徽"]);
dsy.add("0_0",["北京"]);
dsy.add("0_0_0",["北京市","东城","西城","崇文","宣武","朝阳","丰台","石景山","海淀","门头沟","房山","通州","顺义","昌平","大兴","平谷","怀柔","密云","延庆"]);
dsy.add("0_1",["安庆","蚌埠","巢湖","池州","滁州","阜阳","合肥","淮北","淮南","黄山","六安","马鞍山","宿州","铜陵","芜湖","宣城","亳州"]);
dsy.add("0_1_0",["安庆市","怀宁县","潜山县","宿松县","太湖县","桐城市","望江县","岳西县","枞阳县"]);
dsy.add("0_1_1",["蚌埠市","固镇县","怀远县","五河县"]);
dsy.add("0_1_2",["巢湖市","含山县","和县","庐江县","无为县"]);
dsy.add("0_1_3",["池州市","东至县","青阳县","石台县"]);
dsy.add("0_1_4",["滁州市","定远县","凤阳县","来安县","明光市","全椒县","天长市"]);
dsy.add("0_1_5",["阜南县","阜阳市","界首市","临泉县","太和县","颖上县"]);
dsy.add("0_1_6",["长丰县","肥东县","肥西县"]);
dsy.add("0_1_7",["淮北市","濉溪县"]);
dsy.add("0_1_8",["凤台县","淮南市"]);
dsy.add("0_1_9",["黄山市","祁门县","休宁县","歙县","黟县"]);
dsy.add("0_1_10",["霍邱县","霍山县","金寨县","六安市","寿县","舒城县"]);
dsy.add("0_1_11",["当涂县","马鞍山市"]);
dsy.add("0_1_12",["灵璧县","宿州市","萧县","泗县","砀山县"]);
dsy.add("0_1_13",["铜陵市","铜陵县"]);
dsy.add("0_1_14",["繁昌县","南陵县","芜湖市","芜湖县"]);
dsy.add("0_1_15",["广德县","绩溪县","郎溪县","宁国市","宣城市","泾县","旌德县"]);
dsy.add("0_1_16",["利辛县","蒙城县","涡阳县","亳州市"]);

var s =["s1","s2","s3"];
var opt0 = ["省份","地级市","市、县级市、县"];
function setup() {
for(i=0;i<s.length-1;i++)
document.getElementById(s[i]).onchange=new Function("change("+(i+1)+")");
change(0);
}
</SCRIPT>
</head>

<body bgcolor="#FFFFFF" onload="setup()">
<form name="frm">
<select id="s1"><option>省份</option></select>
<select id="s2"><option>地级市</option></select>
<select id="s3"><option>市、县级市、县</option></select>
</form>
</body>
</html>
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