無刷新的2個DropDownList聯動

  <script language="javascript">
<!--
var where = new Array(36); 
function comefrom(loca,locacity) { this.loca = loca; this.locacity = locacity; } 
where[0]= new comefrom("==請選擇==","==請選擇==");
where[1] = new comefrom("北京","|東城|西城|崇文|宣武|朝陽|豐臺|石景山|海淀|門頭溝|房山|通州|順義|昌平|大興|平谷|懷柔|密雲|延慶"); 
where[2] = new comefrom("上海","|黃浦|盧灣|徐匯|長寧|靜安|普陀|閘北|虹口|楊浦|閔行|寶山|嘉定|浦東|金山|松江|青浦|南匯|奉賢|崇明"); 
where[3] = new comefrom("天津","|和平|東麗|河東|西青|河西|津南|南開|北辰|河北|武清|紅撟|塘沽|漢沽|大港|寧河|靜海|寶坻|薊縣"); 
where[4] = new comefrom("重慶","|萬州|涪陵|渝中|大渡口|江北|沙坪壩|九龍坡|南岸|北碚|萬盛|雙撟|渝北|巴南|黔江|長壽|綦江|潼南|銅梁|大足|榮昌|壁山|梁平|城口|豐都|墊江|武隆|忠縣|開縣|雲陽|奉節|巫山|巫溪|石柱|秀山|酉陽|彭水|江津|合川|永川|南川"); 
where[5] = new comefrom("河北","|石家莊|邯鄲|邢臺|保定|張家口|承德|廊坊|唐山|秦皇島|滄州|衡水"); 
where[6] = new comefrom("山西","|太原|大同|陽泉|長治|晉城|朔州|呂梁|忻州|晉中|臨汾|運城"); 
where[7] = new comefrom("內蒙古","|呼和浩特|包頭|烏海|赤峯|呼倫貝爾盟|阿拉善盟|哲里木盟|興安盟|烏蘭察布盟|錫林郭勒盟|巴彥淖爾盟|伊克昭盟"); 
where[8] = new comefrom("遼寧","|瀋陽|大連|鞍山|撫順|本溪|丹東|錦州|營口|阜新|遼陽|盤錦|鐵嶺|朝陽|葫蘆島"); 
where[9] = new comefrom("吉林","|長春|吉林|四平|遼源|通化|白山|松原|白城|延邊"); 
where[10] = new comefrom("黑龍江","|哈爾濱|齊齊哈爾|牡丹江|佳木斯|大慶|綏化|鶴崗|雞西|黑河|雙鴨山|伊春|七臺河|大興安嶺"); 
where[11] = new comefrom("江蘇","|南京|鎮江|蘇州|南通|揚州|鹽城|徐州|連雲港|常州|無錫|宿遷|泰州|淮安|丹徒|丹陽|張家港|太倉|崑山|吳江|海門|如皋|如東|揚中|東臺|溧陽|武進|江陰|錫山|宜興|金壇"); 
where[12] = new comefrom("浙江","|杭州|寧波|溫州|嘉興|湖州|紹興|金華|衢州|舟山|台州|麗水"); 
where[13] = new comefrom("安徽","|合肥|蕪湖|蚌埠|馬鞍山|淮北|銅陵|安慶|黃山|滁州|宿州|池州|淮南|巢湖|阜陽|六安|宣城|亳州"); 
where[14] = new comefrom("福建","|福州|廈門|莆田|三明|泉州|漳州|南平|龍巖|寧德"); 
where[15] = new comefrom("江西","|南昌市|景德鎮|九江|鷹潭|萍鄉|新餘|贛州|吉安|宜春|撫州|上饒"); 
where[16] = new comefrom("山東","|濟南|青島|淄博|棗莊|東營|煙臺|濰坊|濟寧|泰安|威海|日照|萊蕪|臨沂|德州|聊城|濱州|菏澤"); 
where[17] = new comefrom("河南","|鄭州|開封|洛陽|平頂山|安陽|鶴壁|新鄉|焦作|濮陽|許昌|漯河|三門峽|南陽|商丘|信陽|周口|駐馬店|濟源"); 
where[18] = new comefrom("湖北","|武漢|宜昌|荊州|襄樊|黃石|荊門|黃岡|十堰|恩施|潛江|天門|仙桃|隨州|咸寧|孝感|鄂州");
where[19] = new comefrom("湖南","|長沙|常德|株洲|湘潭|衡陽|岳陽|邵陽|益陽|婁底|懷化|郴州|永州|湘西|張家界"); 
where[20] = new comefrom("廣東","|廣州|深圳|珠海|汕頭|東莞|中山|佛山|韶關|江門|湛江|茂名|肇慶|惠州|梅州|汕尾|河源|陽江|清遠|潮州|揭陽|雲浮"); 
where[21] = new comefrom("廣西","|南寧|柳州|桂林|梧州|北海|防城港|欽州|貴港|玉林|南寧地區|柳州地區|賀州|百色|河池"); 
where[22] = new comefrom("海南","|海口|三亞"); 
where[23] = new comefrom("四川","|成都|綿陽|德陽|自貢|攀枝花|廣元|內江|樂山|南充|宜賓|廣安|達川|雅安|眉山|甘孜|涼山|瀘州"); 
where[24] = new comefrom("貴州","|貴陽|六盤水|遵義|安順|銅仁|黔西南|畢節|黔東南|黔南"); 
where[25] = new comefrom("雲南","|昆明|大理|曲靖|玉溪|昭通|楚雄|紅河|文山|思茅|西雙版納|保山|德宏|麗江|怒江|迪慶|臨滄");
where[26] = new comefrom("西藏","|拉薩|日喀則|山南|林芝|昌都|阿里|那曲"); 
where[27] = new comefrom("陝西","|西安|寶雞|咸陽|銅川|渭南|延安|榆林|漢中|安康|商洛"); 
where[28] = new comefrom("甘肅","|蘭州|嘉峪關|金昌|白銀|天水|酒泉|張掖|武威|定西|隴南|平涼|慶陽|臨夏|甘南"); 
where[29] = new comefrom("寧夏","|銀川|石嘴山|吳忠|固原"); 
where[30] = new comefrom("青海","|西寧|海東|海南|海北|黃南|玉樹|果洛|海西"); 
where[31] = new comefrom("新疆","|烏魯木齊|石河子|克拉瑪依|伊犁|巴音郭勒|昌吉|克孜勒蘇柯爾克孜|博爾塔拉|吐魯番|哈密|喀什|和田|阿克蘇"); 
where[32] = new comefrom("香港",""); 
where[33] = new comefrom("澳門",""); 
where[34] = new comefrom("臺灣","|臺北|高雄|臺中|臺南|屏東|南投|雲林|新竹|彰化|苗栗|嘉義|花蓮|桃園|宜蘭|基隆|臺東|金門|馬祖|澎湖"); 
where[35] = new comefrom("國外","|北美洲|南美洲|亞洲|非洲|歐洲|大洋洲"); 
function select() 
{  
   // var obj=document.getElementById("Lable1");
   // obj.Text="dssd";
    //document.all.
   // obj.Text=province.options[province.selectedIndex].value;
    with(document.all.Form1.province) 
    { 
        var loca2 = options[selectedIndex].value; 
        document.all.HiddenValue.value = loca2;
    }
    for(i = 0;i < where.length;i++) 
    {
        if (where[i].loca == loca2) 
            {
            loca3 = (where[i].locacity).split("|");
                for(j = 1;j < loca3.length;j++) 
                { 
                    with(document.all.Form1.city) 
                        { 
                            length = loca3.length; 
                            options[j].text = loca3[j]; 
                            options[j].value = loca3[j];
                            
                        }
                }
            break;
            }
        }
        with(document.all.Form1.city) 
        { 
            options[0].selected = true;
        }
    //document.creator.address.value=loca2+loca4;
}
function select1() {
    with(document.all.Form1.city) 
    {
        var loca4=options[selectedIndex].value;
        document.all.HiddenValueshi.value = loca4;
    }
}

function init() {
     var cprin;
     
    with(document.all.Form1.province) 
    {
        length = where.length;
        for(k=0;k<where.length;k++) 
        {  
            options[k].text = where[k].loca; 
            options[k].value = where[k].loca; 
            if (where[k].loca==document.all.HiddenValue.value)
             cprin=where[k].locacity;
        }
    
        
        if (document.all.HiddenValue.value=="")
          {options[selectedIndex].text = where[0].loca;
           options[selectedIndex].value = where[0].loca;
          }
        else
        {
          options[selectedIndex].text=document.all.HiddenValue.value;
          options[selectedIndex].value=document.all.HiddenValue.value;
        } 
    }
    with(document.all.Form1.city) 
    {
        
        if (document.all.HiddenValueshi.value=="")
        {
            loca3 = (where[0].locacity).split("|");
            length = loca3.length;
            for(l=0;l<length;l++) 
            { 
                options[l].text = loca3[l]; options[l].value = loca3[l]; 
            }
          
           options[selectedIndex].text = where[0].loca; options[selectedIndex].value = where[0].loca;
         }
         else
         {
         
           loca3 = cprin.split("|");
            length = loca3.length;
            for(l=0;l<length;l++) 
            { 
                options[l].text = loca3[l]; options[l].value = loca3[l]; 
            }
           options[selectedIndex].text=document.all.HiddenValueshi.value;
           options[selectedIndex].value=document.all.HiddenValueshi.value;
         } 
           
    }
}
 
-->
        </script>

<body MS_POSITIONING="GridLayout" onload="init();">
        <form id="Form1" method="post" runat="server">
            <asp:dropdownlist id="province" Runat="server"></asp:dropdownlist><asp:dropdownlist id="city" Runat="server"></asp:dropdownlist></SELECT><asp:button id="Button1" style="Z-INDEX: 101; LEFT: 240px; POSITION: absolute; TOP: 48px" runat="server"
                Text="Button"></asp:button><asp:label id="Label1" style="Z-INDEX: 102; LEFT: 280px; POSITION: absolute; TOP: 136px" runat="server">Label</asp:label><input id="HiddenValue" type="hidden" name="HiddenValue" runat="server">
            <input id="HiddenValueshi" type="hidden" name="HiddenValueshi" runat="server">
    </form>
    </body>

 Private Sub Page_Load()Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'If Not Page.IsStartupScriptRegistered("init") Then
        ' Page.RegisterStartupScript("init", "<script>init();</script>")
        'End If

        If Not IsPostBack Then

            province.Attributes.Add("onchange", "select()")
            city.Attributes.Add("onchange", "select1()")

        End If

    End Sub

    Private Sub Button1_Click()Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Response.Write(HiddenValue.Value)
        Response.Write(HiddenValueshi.Value)

    End Sub