省市级联.net

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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