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Using jquery Jsonp to implement Ajax cross-domain request. Net *.handler and WebService, returning JSON data

Source: Internet
Author: User
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1: Cross-domain request handler general handler

usingSystem;usingSystem.Collections.Generic;usingsystem.web;usingSystem.Web.Services;namespacecrossdomain{/// <summary>    ///Summary description of $codebehindclassname $/// </summary>[WebService (Namespace ="http://tempuri.org/")] [WebServiceBinding (ConformsTo=Wsiprofiles.basicprofile1_1)]  Public classHandler:ihttphandler { Public voidProcessRequest (HttpContext context) {context. Response.ContentType="Text/plain"; stringCallbackmethodname = context. request.params["Jsoncallback"]; stringCurrentCity = context. request[" City"]; CurrentCity=string. IsNullOrEmpty (currentcity)?"Beijing":"Shenyang"; stringresult = Callbackmethodname +"({/"city/":"+"/""+ currentcity +"/", /"datetime/":"+"/""+ DateTime.Now +"/"});"; Context.        Response.Write (Result); }         Public BOOLisreusable {Get            {                return false; }        }    }}

Front page:

<!DOCTYPE HTML Public "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.w3.org/TR/xhtml1/DTD/ Xhtml1-transitional.dtd "><HTMLxmlns= "http://www.w3.org/1999/xhtml" ><Head>    <title></title>        <Mce:scripttype= "Text/javascript"language= "JavaScript"src= "Js/jquery-1.4.4.js"mce_src= "Js/jquery-1.4.4.js"></Mce:script>    <Mce:scripttype= "Text/javascript"language= "JavaScript"src= "Js/jquery-1.4.4.js"mce_src= "Js/jquery-1.4.4.js"></Mce:script>    <Mce:scripttype= "Text/javascript"language= "JavaScript"><!--        $ (document). Ready (function () {//var Clienturl = "http://localhost:4508/Handler.ashx?jsoncallback=?";        var clienturl = "http://192.168.120.179:8086/Handler.ashx?jsoncallback=?"        var currentcity = "Harbin";                $.ajax ({url:clienturl, DataType: "Jsonp", data: {city:currentcity},        Success:onsuccess, error:onerror});        });        function onsuccess (JSON) {$ ("#data"). HTML ("City:" + json.city + ", Time:" + json.datetime);            } function OnError (XMLHttpRequest, Textstatus, errorthrown) {Targetdiv = $ ("#data"); if (Errorthrown | | textstatus = = "Error" | | textstatus = = "ParserError" | | textstatus = "notmodified") {T Argetdiv.replacewith ("An error occurred while requesting data!                ");            Return } if (textstatus = = "Timeout") {Targetdiv.replacewith ("Request data Timeout!                ");            Return   }        } //   -</Mce:script></Head><Body><DivID= "Data"></Div></Body></HTML>

2:webservice as the target for cross-domain requests:

usingSystem;usingSystem.Collections.Generic;usingsystem.web;usingSystem.Web.Services;namespacecrossdomain{/// <summary>    ///Summary description of $codebehindclassname $/// </summary>[WebService (Namespace ="http://tempuri.org/")] [WebServiceBinding (ConformsTo=Wsiprofiles.basicprofile1_1)]  Public classHandler:ihttphandler { Public voidProcessRequest (HttpContext context) {context. Response.ContentType="Text/plain"; stringCallbackmethodname = context. request.params["Jsoncallback"]; stringCurrentCity = context. request[" City"]; CurrentCity=string. IsNullOrEmpty (currentcity)?"Beijing":"Shenyang"; stringresult = Callbackmethodname +"({/"city/":"+"/""+ currentcity +"/", /"datetime/":"+"/""+ DateTime.Now +"/"});"; Context.        Response.Write (Result); }         Public BOOLisreusable {Get            {                return false; }        }    }}

Page code:

<!DOCTYPE HTML Public "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.w3.org/TR/xhtml1/DTD/ Xhtml1-transitional.dtd "><HTMLxmlns= "http://www.w3.org/1999/xhtml" ><Head>    <title></title>        <Mce:scripttype= "Text/javascript"language= "JavaScript"src= "Js/jquery-1.4.4.js"mce_src= "Js/jquery-1.4.4.js"></Mce:script>    <Mce:scripttype= "Text/javascript"language= "JavaScript"><!--        $ (document). Ready (function () {//var Clienturl = "Http://localhost:4508/WebService.asmx/HelloWorld?json            Callback=? ";            var clienturl = "http://192.168.120.179:8086/WebService.asmx/HelloWorld?jsoncallback=?";            var currentcity = "Harbin";                    $.getjson (Clienturl, {city:currentcity}, function (JSON) {                $ ("#data"). HTML ("City:" + json.city + ", Time:" + json.datetime);        }            );        });        function onsuccess (responsedata) {$ ("#data"). HTML (responsedata.city);            } function OnError (XMLHttpRequest, Textstatus, errorthrown) {Targetdiv = $ ("#data"); if (Errorthrown | | textstatus = = "Error" | | textstatus = = "ParserError" | | textstatus = "notmodified") {T Argetdiv.replacewith ("An error occurred while requesting data!                ");            Return } if (textstatus = = "Timeout") {Targetdiv.replacewith ("request dataTimeout!                ");            Return  }        }    // -</Mce:script></Head><Body><DivID= "Data"></Div></Body></HTML>

Note Configure Webconfig:

    <webservices>          <Protocols>            <Addname= "HttpGet"/>            <Addname= "HttpPost"/>          </Protocols>        </webservices>

Using jquery Jsonp to implement Ajax cross-domain request. Net *.handler and WebService, returning JSON data

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