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初学javascript，编译省市级联，使用json在一般处理程序中编译，利用ajax传递数据到web前台
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>json</title>
<script language="javascript" type="text/javascript">
<!--
var provincelist;
function getarea() {
var xmlhttp;
var _province = document.getElementById("province");
var msg = document.getElementById("province").value;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
provincelist = eval("(" + xmlhttp.responseText + ")");
for (var p in provincelist.Area) {
var opt_1 = new Option(provincelist.Area[p].name, provincelist.Area[p].id);
_province.add(opt_1);
}
}
}
xmlhttp.open("GET", "Handler1.ashx?q=" + msg, true);
xmlhttp.send();
}
function tocity() {
var _province = document.getElementById("province");
var _city = document.getElementById("city");
var _region = document.getElementById("region");
var v_province = _province.value;
_city.options.length = 1;
_region.options.length = 1;
for (var p in provincelist.Area) {
if (provincelist.Area[p].id == v_province) {
for (var e in provincelist.Area[p].city) {
var opt_2 = new Option( provincelist.Area[p].city[e].name,provincelist.Area[p].city[e].id);
_city.add(opt_2);
}
break;
}
}
}
function toregion() {
var _province = document.getElementById("province");
var _city = document.getElementById("city");
var _region = document.getElementById("region");
var v_province = _province.value;
var v_city = _city.value;
//_province.options.length=1;
_region.options.length = 1;
for (var p in provincelist.Area) {
if (provincelist.Area[p].id == v_province) {
for (var e in provincelist.Area[p].city) {
//alert(place_list[e].province[p].value);
if (provincelist.Area[p].city[e].id == v_city) {
// alert(place_list[e].province[p].value);
//document.getElementById("Label3").innerHTML = v_province;
for (var k in provincelist.Area[p].city[e].region) {
var opt_3 = new Option(provincelist.Area[p].city[e].region[k].name, provincelist.Area[p].city[e].region[k].id);
_region.add(opt_3);
}
// document.getElementById("Label5").innerHTML = v_city ;
return;
}
}
break;
}
}
}
//-->
</script>
</head>
<body onload="getarea();">
<select id="province" onchange="tocity();">
<option value="-1">--请选择国家---</option>
</select>
<select id="city" onchange="toregion();" >
<option value="-1">--请选择省份---</option>
</select>
<select id="region" >
<option value="-1">--请选择市区---</option>
</select>
</body>
</html>
/// <summary>
/// Handler1 的摘要说明
/// </summary>
public class Handler1 : IHttpHandler
{
//public DataSet sqldataset = new DataSet();
public void ProcessRequest(HttpContext context)
{
string provincelist = "{\"Area\":[{\"id\": \"350000\", \"name\": \"福建\", \"city\": "
+"["
+"{ \"id\": \"350100\", \"name\": \"福州市\", \"region\":"
+"["
+"{ \"id\": \"350102\", \"name\": \"鼓楼区\" }, "
+"{ \"id\": \"350182\", \"name\": \"长乐市\"}"
+"]"
+"},"
+"{ \"id\": \"350200\", \"name\": \"厦门市\", \"region\":"
+"[{ \"id\": \"350203\", \"name\": \"思明区\" },"
+"{ \"id\": \"350212\", \"name\": \"同安区\"}"
+"]"
+"}, "
+"{ \"id\": \"350300\", \"name\": \"莆田市\", \"region\":"
+"[{ \"id\": \"350302\", \"name\": \"城厢区\" },"
+"{ \"id\": \"350322\", \"name\": \"仙游县\" }"
+"]"
+"},"
+"{ \"id\": \"350400\", \"name\": \"三明市\", \"region\": "
+"[{ \"id\": \"350402\", \"name\": \"梅列区\" },"
+"{ \"id\": \"350403\", \"name\": \"三元区\" }"
+"]"
+"}, "
+"{ \"id\": \"350500\", \"name\": \"泉州市\", \"region\":"
+"[{ \"id\": \"350502\", \"name\": \"鲤城区\" },"
+"{ \"id\": \"350503\", \"name\": \"丰泽区\" }"
+"]"
+"},"
+"{ \"id\": \"350600\", \"name\": \"漳州市\", \"region\": "
+"[{ \"id\": \"350602\", \"name\": \"芗城区\" },"
+"{ \"id\": \"350603\", \"name\": \"龙文区\" }"
+"]"
+"},"
+"{ \"id\": \"350700\", \"name\": \"南平市\", \"region\":"
+"[{ \"id\": \"350702\", \"name\": \"延平区\" },"
+"{ \"id\": \"350721\", \"name\": \"顺昌县\" }"
+"]"
+"},"
+"{ \"id\": \"350900\", \"name\": \"宁德市\", \"region\": "
+"[{ \"id\": \"350902\", \"name\": \"蕉城区\" },"
+"{ \"id\": \"350921\", \"name\": \"霞浦县\" }"
+" ]"
+" }"
+" ]"
+" },"
+"{ \"id\": \"360000\", \"name\": \"江西\", \"city\": "
+"["
+"{ \"id\": \"360100\", \"name\": \"南昌市\", \"region\": "
+"[ { \"id\": \"360102\", \"name\": \"东湖区\" },"
+"{ \"id\": \"360103\", \"name\": \"西湖区\"}"
+" ]"
+"},"
+"{ \"id\": \"360200\", \"name\": \"景德镇市\", \"region\": "
+"[{ \"id\": \"360202\", \"name\": \"昌江区\" },"
+"{ \"id\": \"360203\", \"name\": \"珠山区\"}"
+"]"
+"},"
+"{ \"id\": \"360300\", \"name\": \"萍乡市\", \"region\":"
+" ["
+" { \"id\": \"360302\", \"name\": \"安源区\" },"
+"{\"id\":\"360313\",\"name\":\"湘东区\"}"
+" ]"
+"},"
+"{\"id\":\"360400\",\"name\":\"九江市\",\"region\":"
+"[{\"id\":\"360402\",\"name\":\"庐山区\"},"
+" {\"id\":\"360403\",\"name\":\"浔阳区\"}"
+"]"
+" },"
+" {\"id\":\"360500\",\"name\":\"新余市\",\"region\":"
+" [{\"id\":\"360502\",\"name\":\"渝水区\"},"
+" {\"id\":\"360521\",\"name\":\"分宜县\"}"
+" ]"
+"},"
+"{\"id\":\"360600\",\"name\":\"鹰潭市\",\"region\":"
+"[ {\"id\":\"360602\",\"name\":\"月湖区\"},"
+" {\"id\":\"360622\",\"name\":\"余江县\"}"
+" ]"
+" },"
+"{\"id\":\"360700\",\"name\":\"赣州市\",\"region\":"
+"[{\"id\":\"360702\",\"name\":\"章贡区\"},"
+" {\"id\":\"360721\",\"name\":\"赣县\"}"
+" ]"
+"},"
+" {\"id\":\"360800\",\"name\":\"吉安市\",\"region\":"
+"[{\"id\":\"360802\",\"name\":\"吉州区\"},"
+"{\"id\":\"360803\",\"name\":\"青原区\"}"
+" ]"
+"},"
+"{\"id\":\"360900\",\"name\":\"宜春市\",\"region\":"
+"[{\"id\":\"360902\",\"name\":\"袁州区\"},"
+"{\"id\":\"360921\",\"name\":\"奉新县\"}"
+"]"
+"},"
+"{\"id\":\"361000\",\"name\":\"抚州地区\",\"region\":"
+"[{\"id\":\"361002\",\"name\":\"临川区\"},"
+"{\"id\":\"361021\",\"name\":\"南城县\"}"
+"]"
+"},"
+" {\"id\":\"361100\",\"name\":\"上饶市\",\"region\":"
+" [{\"id\":\"361102\",\"name\":\"信州区\"},"
+"{\"id\":\"361121\",\"name\":\"上饶县\"}"
+"]"
+" }"
+"]"
+ "}]}";
context.Response.ContentType = "text/plain";
context.Response.Write(provincelist);
}
public bool IsReusable
{
get
{
return false;
}
}
}
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原文地址：http://www.cnblogs.com/zhi5429/p/4501464.html
