使用AjaxPro开发四级无刷新联动下拉框

开发环境 VS.NET 2005 C# Oracle AjaxPro

最近忙没时间详细解释，先把通用的源码贴出自己看。

出于对性能的考虑，把省市两级写成JS数组，把县区（镇）两级写在 Oracle 里。通过 JS 触发 C# 去读取数据库，然后将数据回传给 JS ，再绑定显示。

操作 <select> 采用更通用的 createElement() 而没有使用 options.add()

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Area.aspx.cs" Inherits="Area" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

<table>

<tr>

<td>

</select>

</td>

<td>

</select>

</td>

<td>

</select>

</td>

<td>

</select>

</td>

</tr>

</table>

var aDQ=new Array();

aDQ[0]=["11","北京","0","bj"];

aDQ[1]=["12","天津","0","tj"];

aDQ[2]=["13","河北","0","hb"];

aDQ[3]=["14","山西","0","shang"];

aDQ[4]=["15","内蒙古","0","nmg"];

aDQ[5]=["21","辽宁","0","ln"];

aDQ[6]=["22","吉林","0","jl"];

aDQ[7]=["23","黑龙江","0","hlj"];

aDQ[8]=["31","上海","0","sh"];

aDQ[9]=["32","江苏","0","js"];

aDQ[10]=["33","浙江","0","zhej"];

aDQ[11]=["34","安徽","0","ah"];

aDQ[12]=["35","福建","0","fj"];

aDQ[13]=["36","江西","0","jw"];

aDQ[14]=["37","山东","0","sd"];

aDQ[15]=["41","河南","0","he"];

aDQ[16]=["42","湖北","0","hu"];

aDQ[17]=["43","湖南","0","hn"];

aDQ[18]=["44","广东","0","gd"];

aDQ[19]=["45","广西","0","gx"];

aDQ[20]=["46","海南","0","hain"];

aDQ[21]=["50","重庆","0","cq"];

aDQ[22]=["51","四川","0","sc"];

aDQ[23]=["52","贵州","0","gui"];

aDQ[24]=["53","云南","0","yn"];

aDQ[25]=["54","西藏","0","wc"];

aDQ[26]=["61","陕西","0","shangx"];

aDQ[27]=["62","甘肃","0","gs"];

aDQ[28]=["63","青海","0","qh"];

aDQ[29]=["64","宁夏","0","nx"];

aDQ[30]=["65","新疆","0","xj"];

aDQ[31]=["71","台湾","0","tw"];

aDQ[32]=["81","香港","0","xg"];

aDQ[33]=["82","澳门","0","am"];

aDQ[34]=["1101","北京城区","11","bjcq"];

aDQ[35]=["1102","北京县区","11","bjxq"];

aDQ[36]=["1201","天津城区","12","tjcq"];

aDQ[37]=["1202","天津县区","12","tjxq"];

aDQ[38]=["1301","石家庄","13","sjz"];

aDQ[39]=["1302","唐山","13","hbts"];

aDQ[40]=["1303","秦皇岛","13","qhd"];

aDQ[41]=["1304","邯郸","13","hd"];

aDQ[42]=["1305","邢台","13","hbxt"];

aDQ[43]=["1306","保定","13","bd"];

aDQ[44]=["1307","张家口","13","zjk"];

aDQ[45]=["1308","承德","13","cd"];

aDQ[46]=["1309","沧州","13","hbcz"];

aDQ[47]=["1310","廊坊","13","lf"];

aDQ[48]=["1311","衡水","13","hbhs"];

aDQ[49]=["1401","太原","14","ty"];

aDQ[50]=["1402","大同","14","dt"];

aDQ[51]=["1403","阳泉","14","yq"];

aDQ[52]=["1404","长治","14","swcz"];

aDQ[53]=["1405","晋城","14","swjc"];

aDQ[54]=["1406","朔州","14","swsz"];

aDQ[55]=["1501","呼和浩特","15","hhht"];

aDQ[56]=["1502","包头","15","bt"];

aDQ[57]=["1503","乌海","15","nmgwh"];

aDQ[58]=["1504","赤峰","15","cf"];

aDQ[59]=["1521","呼伦贝尔盟","15","hlbem"];

aDQ[60]=["1522","兴安盟","15","xam"];

aDQ[61]=["1523","哲里木盟","15","zlmm"];

aDQ[62]=["1525","锡林郭勒盟","15","wlglm"];

aDQ[63]=["1526","乌兰察布盟","15","wlcbm"];

aDQ[64]=["1527","鄂尔多斯","15","eeds"];

aDQ[65]=["1528","巴彦淖尔盟","15","bynem"];

aDQ[66]=["1529","阿拉善盟","15","alsm"];

aDQ[67]=["2101","沈阳","21","lnsy"];

aDQ[68]=["2102","大连","21","dl"];

aDQ[69]=["2103","鞍山","21","as"];

aDQ[70]=["2104","抚顺","21","lnfs"];

aDQ[71]=["2105","本溪","21","bx"];

aDQ[72]=["2106","丹东","21","dd"];

aDQ[73]=["2107","锦州","21","jz"];

aDQ[74]=["2108","营口","21","yk"];

aDQ[75]=["2109","阜新","21","fx"];

aDQ[76]=["2110","辽阳","21","lnly"];

aDQ[77]=["2111","盘锦","21","pj"];

aDQ[78]=["2112","铁岭","21","lntl"];

aDQ[79]=["2113","朝阳","21","cy"];

aDQ[80]=["2114","葫芦岛","21","hld"];

aDQ[81]=["2201","长春","22","cc"];

aDQ[82]=["2202","吉林","22","jljl"];

aDQ[83]=["2203","四平","22","sp"];

aDQ[84]=["2204","辽源","22","jlly"];

aDQ[85]=["2205","通化","22","th"];

aDQ[86]=["2206","白山","22","bs"];

aDQ[87]=["2207","松原","22","jlsy"];

aDQ[88]=["2208","白城","22","bc"];

aDQ[89]=["2224","延边","22","jlyb"];

aDQ[90]=["2301","哈尔滨","23","heb"];

aDQ[91]=["2302","齐齐哈尔","23","qqhe"];

aDQ[92]=["2303","鸡西","23","hljjw"];

aDQ[93]=["2304","鹤岗","23","hg"];

aDQ[94]=["2305","双鸭山","23","sys"];

aDQ[95]=["2306","大庆","23","dq"];

aDQ[96]=["2307","伊春","23","hljyc"];

aDQ[97]=["2308","佳木斯","23","jms"];

aDQ[98]=["2309","七台河","23","qth"];

aDQ[99]=["2310","牡丹江","23","mdj"];

aDQ[100]=["2311","黑河","23","hh"];

aDQ[101]=["3101","上海市区","31","shsq"];

aDQ[102]=["3102","上海县区","31","shxq"];

aDQ[103]=["3201","南京","32","nj"];

aDQ[104]=["3202","无锡","32","ww"];

aDQ[105]=["3203","徐州","32","xz"];

aDQ[106]=["3204","常州","32","jscz"];

aDQ[107]=["3205","苏州","32","shu"];

aDQ[108]=["3206","南通","32","nt"];

aDQ[109]=["3207","连云港","32","lyg"];

aDQ[110]=["3208","淮安","32","ha"];

aDQ[111]=["3209","盐城","32","jsyc"];

aDQ[112]=["3210","扬州","32","yz"];

aDQ[113]=["3211","镇江","32","jszj"];

aDQ[114]=["3212","泰州","32","tz"];

aDQ[115]=["3213","宿迁","32","sq"];

aDQ[116]=["3301","杭州","33","han"];

aDQ[117]=["3302","宁波","33","nb"];

aDQ[118]=["3303","温州","33","zjwz"];

aDQ[119]=["3304","嘉兴","33","jx"];

aDQ[120]=["3305","湖州","33","zjhz"];

aDQ[121]=["3306","绍兴","33","sx"];

aDQ[122]=["3307","金华","33","jh"];

aDQ[123]=["3308","衢州","33","zjqz"];

aDQ[124]=["3309","舟山","33","zjzs"];

aDQ[125]=["3310","台州","33","zjtz"];

aDQ[126]=["3311","义乌","33","yw"];

aDQ[127]=["3325","丽水","33","zjls"];

aDQ[128]=["3401","合肥","34","hf"];

aDQ[129]=["3402","芜湖","34","wh"];

aDQ[130]=["3403","蚌埠","34","bb"];

aDQ[131]=["3404","淮南","34","hnx"];

aDQ[132]=["3405","马鞍山","34","mas"];

aDQ[133]=["3406","淮北","34","huib"];

aDQ[134]=["3407","铜陵","34","tl"];

aDQ[135]=["3408","安庆","34","aq"];

aDQ[136]=["3410","黄山","34","hs"];

aDQ[137]=["3411","滁州","34","ahcz"];

aDQ[138]=["3412","阜阳","34","fy"];

aDQ[139]=["3413","宿州","34","ahsz"];

aDQ[140]=["3416","毫州","34","ahhz"];

aDQ[141]=["51011117","池州","34",""];

aDQ[142]=["51011118","六安","34",""];

aDQ[143]=["51011119","宣城 ","34",""];

aDQ[144]=["3501","福州","35","fz"];

aDQ[145]=["3502","厦门","35","xm"];

aDQ[146]=["3503","莆田","35","pt"];

aDQ[147]=["3504","三明","35","sm"];

aDQ[148]=["3505","泉州","35","qz"];

aDQ[149]=["3506","漳州","35","fzz"];

aDQ[150]=["3507","南平","35","np"];

aDQ[151]=["3508","龙岩","35","fjly"];

aDQ[152]=["3509","宁德","35","fjnd"];

aDQ[153]=["3601","南昌","36","jwnc"];

aDQ[154]=["3602","景德镇","36","jdz"];

aDQ[155]=["3603","萍乡","36","px"];

aDQ[156]=["3604","九江","36","jj"];

aDQ[157]=["3605","新余","36","xy"];

aDQ[158]=["3606","鹰潭","36","jwyt"];

aDQ[159]=["3607","赣州","36","jwgz"];

aDQ[160]=["3701","济南","37","jn"];

aDQ[161]=["3702","青岛","37","qd"];

aDQ[162]=["3703","淄博","37","zb"];

aDQ[163]=["3704","枣庄","37","sdzz"];

aDQ[164]=["3705","东营","37","sddy"];

aDQ[165]=["3706","烟台","37","yt"];

aDQ[166]=["3707","潍坊","37","wf"];

aDQ[167]=["3708","济宁","37","sdjn"];

aDQ[168]=["3709","泰安","37","ta"];

aDQ[169]=["3710","威海","37","sdwh"];

aDQ[170]=["3711","日照","37","rz"];

aDQ[171]=["3712","莱芜","37","lw"];

aDQ[172]=["3713","临沂","37","ly"];

aDQ[173]=["3714","德州","37","sddz"];

aDQ[174]=["3715","聊城","37","lc"];

aDQ[175]=["4101","郑州","41","zhen"];

aDQ[176]=["4102","开封","41","kf"];

aDQ[177]=["4103","洛阳","41","hnly"];

aDQ[178]=["4104","平顶山","41","pds"];

aDQ[179]=["4105","安阳","41","ay"];

aDQ[180]=["4106","鹤壁","41","hebi"];

aDQ[181]=["4107","新乡","41","xx"];

aDQ[182]=["4108","焦作","41","hnjz"];

aDQ[183]=["4109","濮阳","41","zy"];

aDQ[184]=["4110","许昌","41","xc"];

aDQ[185]=["4111","漯河","41","zhe"];

aDQ[186]=["4112","三门峡","41","smx"];

aDQ[187]=["4113","南阳","41","ny"];

aDQ[188]=["4114","商丘","41","hnsq"];

aDQ[189]=["4115","信阳","41","hnxy"];

aDQ[190]=["4201","武汉","42","hbwh"];

aDQ[191]=["4202","黄石","42","hhs"];

aDQ[192]=["4203","十堰","42","sy"];

aDQ[193]=["4205","宜昌","42","hbyc"];

aDQ[194]=["4206","襄樊","42","xf"];

aDQ[195]=["4207","鄂州","42","ez"];

aDQ[196]=["4208","荆门","42","hbjm"];

aDQ[197]=["4209","孝感","42","hbxg"];

aDQ[198]=["4210","荆州","42","hbjz"];

aDQ[199]=["4211","黄冈","42","hbhg"];

aDQ[200]=["4212","咸宁","42","xn"];

aDQ[201]=["4228","恩施","42","es"];

aDQ[202]=["4301","长沙","43","cs"];

aDQ[203]=["4302","株洲","43","hnzz"];

aDQ[204]=["4303","湘潭","43","xt"];

aDQ[205]=["4304","衡阳","43","hnhy"];

aDQ[206]=["4305","邵阳","43","shao"];

aDQ[207]=["4306","岳阳","43","yy"];

aDQ[208]=["4307","常德","43","hncd"];

aDQ[209]=["4308","张家界","43","zjj"];

aDQ[210]=["4309","益阳","43","hnyy"];

aDQ[211]=["4310","郴州","43","hncz"];

aDQ[212]=["4311","永州","43","hnyz"];

aDQ[213]=["4312","怀化","43","hnhh"];

aDQ[214]=["4331","湘西","43","xw"];

aDQ[215]=["4401","广州","44","gz"];

aDQ[216]=["4402","韶关","44","sg"];

aDQ[217]=["4403","深圳","44","sz"];

aDQ[218]=["4404","珠海","44","zh"];

aDQ[219]=["4405","汕头","44","st"];

aDQ[220]=["4406","佛山","44","fs"];

aDQ[221]=["4407","江门","44","jm"];

aDQ[222]=["4408","湛江","44","zj"];

aDQ[223]=["4409","茂名","44","mm"];

aDQ[224]=["4412","肇庆","44","zq"];

aDQ[225]=["4413","惠州","44","hz"];

aDQ[226]=["4414","梅州","44","mz"];

aDQ[227]=["4415","汕尾","44","shanw"];

aDQ[228]=["4416","河源","44","hy"];

aDQ[229]=["4417","阳江","44","yj"];

aDQ[230]=["4418","清远","44","qy"];

aDQ[231]=["4419","东莞","44","dz"];

aDQ[232]=["4420","中山","44","zs"];

aDQ[233]=["4451","潮州","44","cz"];

aDQ[234]=["4452","揭阳","44","jy"];

aDQ[235]=["4453","云浮","44","yf"];

aDQ[236]=["4501","南宁","45","nn"];

aDQ[237]=["4502","柳州","45","lz"];

aDQ[238]=["4503","桂林","45","gwgl"];

aDQ[239]=["4504","梧州","45","gwwz"];

aDQ[240]=["4505","北海","45","bh"];

aDQ[241]=["4506","防城港","45","fcg"];

aDQ[242]=["4507","钦州","45","gqz"];

aDQ[243]=["4508","贵港","45","gg"];

aDQ[244]=["4509","玉林","45","yl"];

aDQ[245]=["4601","海口","46","hk"];

aDQ[246]=["4602","三亚","46","hnsy"];

aDQ[247]=["5002","重庆县区","50","zqxq"];

aDQ[248]=["5003","重庆城区","50","zqcq"];

aDQ[249]=["5101","成都","51","sccd"];

aDQ[250]=["5103","自贡","51","zg"];

aDQ[251]=["5104","攀枝花","51","pzh"];

aDQ[252]=["5105","泸州","51","sczz"];

aDQ[253]=["5106","德阳","51","dy"];

aDQ[254]=["5107","绵阳","51","my"];

aDQ[255]=["5108","广元","51","gy"];

aDQ[256]=["5109","遂宁","51","sn"];

aDQ[257]=["5110","内江","51","scnj"];

aDQ[258]=["5111","乐山","51","ls"];

aDQ[259]=["5113","南充","51","nc"];

aDQ[260]=["5115","宜宾","51","yb"];

aDQ[261]=["5116","广安","51","ga"];

aDQ[262]=["5130","达州","51","scdz"];

aDQ[263]=["5132","阿坝","51","ab"];

aDQ[264]=["5133","甘孜","51","scgz"];

aDQ[265]=["5134","凉山","51","scls"];

aDQ[266]=["5201","贵阳","52","gzgy"];

aDQ[267]=["5202","六盘水","52","lps"];

aDQ[268]=["5203","遵义","52","gzzy"];

aDQ[269]=["5223","黔西南","52","qwn"];

aDQ[270]=["5226","黔东南","52","qdn"];

aDQ[271]=["5227","黔南","52","qn"];

aDQ[272]=["5301","昆明","53","km"];

aDQ[273]=["5303","曲靖","53","qj"];

aDQ[274]=["5304","玉溪","53","yx"];

aDQ[275]=["5323","楚雄","53","cx"];

aDQ[276]=["5325","红河","53","ynhh"];

aDQ[277]=["5326","文山","53","ws"];

aDQ[278]=["5328","西双版纳","53","wsbn"];

aDQ[279]=["5329","大理","53","yndl"];

aDQ[280]=["5331","德宏","53","dh"];

aDQ[281]=["5333","怒江","53","nuj"];

aDQ[282]=["5334","迪庆","53","yndq"];

aDQ[283]=["51010963","丽江市","53","ljs"];

aDQ[284]=["51012663","保山","53",""];

aDQ[285]=["5401","拉萨","54","wcls"];

aDQ[286]=["6101","西安","61","wa"];

aDQ[287]=["6102","铜川","61","tc"];

aDQ[288]=["6103","宝鸡","61","swbj"];

aDQ[289]=["6104","咸阳","61","swxy"];

aDQ[290]=["6105","渭南","61","swwn"];

aDQ[291]=["6106","延安","61","ya"];

aDQ[292]=["6107","汉中","61","swhz"];

aDQ[293]=["6201","兰州","62","gslz"];

aDQ[294]=["6202","嘉峪关","62","jyg"];

aDQ[295]=["6203","金昌","62","jc"];

aDQ[296]=["6204","白银","62","by"];

aDQ[297]=["6205","天水","62","ts"];

aDQ[298]=["6229","临夏","62","lx"];

aDQ[299]=["6230","甘南","62","gn"];

aDQ[300]=["6301","西宁","63","wn"];

aDQ[301]=["6322","海北","63","hai"];

aDQ[302]=["6323","黄南","63","huang"];

aDQ[303]=["6325","海南","63","qhhn"];

aDQ[304]=["6326","果洛","63","gl"];

aDQ[305]=["6327","玉树","63","ys"];

aDQ[306]=["6328","海西","63","hw"];

aDQ[307]=["6401","银川","64","yc"];

aDQ[308]=["6402","石嘴山","64","szs"];

aDQ[309]=["6403","吴忠","64","wz"];

aDQ[310]=["6405","中卫","64","zw"];

aDQ[311]=["6501","乌鲁木齐","65","wlmq"];

aDQ[312]=["6502","克拉玛依","65","klmy"];

aDQ[313]=["6523","昌吉","65","cj"];

aDQ[314]=["6527","博尔塔拉","65","betl"];

aDQ[315]=["6528","巴音郭楞","65","bygl"];

aDQ[316]=["6530","克孜勒苏柯尔克孜","65","kzlskekz"];

aDQ[317]=["6540","伊犁","65","xjyl"];

aDQ[318]=["7101","台北","71",""];

aDQ[319]=["7102","宜兰","71",""];

aDQ[320]=["7103","桃园","71",""];

aDQ[321]=["7104","新竹","71",""];

aDQ[322]=["7105","苗栗","71",""];

aDQ[323]=["7106","台中","71",""];

aDQ[324]=["7107","彰化","71",""];

aDQ[325]=["7108","南投","71",""];

aDQ[326]=["7109","云林","71",""];

aDQ[327]=["7110","嘉义","71",""];

aDQ[328]=["7111","台南","71",""];

aDQ[329]=["7112","高雄","71",""];

aDQ[330]=["7113","屏东","71",""];

aDQ[331]=["7114","台东","71",""];

aDQ[332]=["7115","花莲","71",""];

aDQ[333]=["7116","澎湖","71",""];

aDQ[334]=["7117","基隆","71",""];

aDQ[335]=["7118","金门","71",""];

aDQ[336]=["7119","马祖","71",""];

aDQ[337]=["8101","新界","81",""];

aDQ[338]=["8102","香港岛","81",""];

aDQ[339]=["8103","大屿山","81",""];

aDQ[340]=["8104","九龙","81",""];

aDQ[341]=["8201","澳门本岛","82",""];

aDQ[342]=["8202","凼仔","82",""];

aDQ[343]=["8203","路环","82",""];

//通过 DOM 创建下拉框 http://www.knowsky.com/qq.asp

//obj:下拉框的 options 数据集

//id:下拉框的 id

function CreateDropDownList(obj,id)

......{

var sel=document.getElementById(id);

sel.options.length=1; //保存"—请选择—"

//对于省份、城市常用 Array 存储，对于县、镇则用C#从数据库读取

if(obj==null)return;

if(obj instanceof Array)

......{

for(var i=0;i<obj.length;i++)

......{

var op=document.createElement("option");

op.setAttribute("value",obj[i][0]);

var txt=document.createTextNode(obj[i][1]);

op.appendChild(txt);

sel.appendChild(op);

}

else

......{

for(var i=0;i<obj.Rows.length;i++) //注意这里是 length 不是 Count

......{

var op=document.createElement("option");

op.setAttribute("value",obj.Rows[i].ID); //注意区分大小写

var txt=document.createTextNode(obj.Rows[i].NAME); //根 DataTable 的列名称要一致

op.appendChild(txt);

sel.appendChild(op);

}

//绑定下一个下拉框

switch(id)

......{

case "SF":sel.onchange=function()......{ClearXianZhen();CreateDropDownList(GetArray(this.value),"CS");};break;

case "CS":sel.onchange=function()......{ClearZhen();CreateDropDownList(Area.GetDataTable(this.value,AreaEnum.Xian).value,"Xian");};break; //JS 向 C# 传递参数，并取得 C# 的返回值

case "Xian":sel.onchange=function()......{CreateDropDownList(Area.GetDataTable(this.value,AreaEnum.Zhen).value,"Zhen");};break; //返回值.value

default:sel.onchange=function()......{alert(this.value);};break;

}

//执行入口

var arr=GetArray("0");

CreateDropDownList(arr,"SF");

//获取要求的数组

//tar=所属的省份ID

function GetArray(val)

......{

var temp=new Array();

var j=0;

for(var i=0;i<aDQ.length;i++)

......{

if(aDQ[i][2].toString()==val)

......{

temp[j]=aDQ[i];

//temp[j].push(aDQ[i]);

j++;

}

return temp;

}

//清空"镇"下拉框

function ClearZhen()

......{

CreateDropDownList(null,"Zhen");

}

//清空"县"和"镇"下拉框

function ClearXianZhen()

......{

CreateDropDownList(null,"Xian");

CreateDropDownList(null,"Zhen");

}

</script>

</form>

</body>

</html>

using System;

using System.Data;

using System.Data.OracleClient;

public partial class Area : System.Web.UI.Page

...{

protected void Page_Load(object sender, EventArgs e)

...{

//将C#的类和枚举分别注册到JS里

AjaxPro.Utility.RegisterTypeForAjax(typeof(Area));

AjaxPro.Utility.RegisterEnumForAjax(typeof(AreaEnum));

}

/**//// <summary>

/// 取得下拉框所需数据

/// </summary>

/// <param name="UpID">上一级ID</param>

/// <param name="ae">县/镇</param>

/// <returns>返回 DataTable</returns>

[AjaxPro.AjaxMethod]

public DataTable GetDataTable(string UpID, AreaEnum ae)

...{

if (String.IsNullOrEmpty(UpID))

return null;

string link = "server=XXX;user=XXX;pwd=XXX;";

OracleConnection conn = new OracleConnection(link);

//Oracle 返回的 DataTable 里的列名全是大写，在页面取值时记得大写

string sql;

if (Enum.Equals(ae, AreaEnum.Xian))

sql = "SELECT id,name FROM City WHERE THREEID=0 AND TWOID=" + UpID;

else

sql = "SELECT id,name FROM City WHERE THREEID=" + UpID;

OracleDataAdapter adapter = new OracleDataAdapter(sql, conn);

DataTable table = new DataTable();

adapter.Fill(table);

return table;

}

/**//// <summary>

/// 地区枚举

/// </summary>

public enum AreaEnum

...{

/**//// <summary>

/// 县

/// </summary>

Xian,

/**//// <summary>

/// 镇

/// </summary>

Zhen

}

到此基本功能实现，还有些功能（通过域名\IP来判断地区并直接绑定，将选择好的地区保存，方便的读/存城市信息以便做成控件等等）。有空再写完。

记得在 Web.config 的 <system.web> 加入

</httpHandlers>