jQuery Ajax调用httpget webmethod（C＃）无效
我正在尝试使ajax进入后面代码中的web方法。问题是我不断从jQuery onfail方法中收到错误“ parserror” 。
如果我将GET更改为POST，则一切正常。请在下面查看我的代码。
<script type="text/javascript"> var id = "li1234";
function AjaxGet() {
$.ajax({
type: "GET",
url: "webmethods.aspx/AjaxGet",
data: "{ 'id' : '" + id + "'}",
contentType: "application/json; charset=utf-8",
dataType: "json",
async: false,
success: function(msg) {
alert("success");
},
error: function(msg, text) {
alert(text);
}
});
}
</script>
[System.Web.Services.WebMethod][System.Web.Script.Services.ScriptMethod(UseHttpGet = true,
ResponseFormat = System.Web.Script.Services.ResponseFormat.Json)]
public static string AjaxGet(string id)
{
return id;
}
<webServices> <protocols>
<add name="HttpGet"/>
</protocols>
</webServices>
........ / webmethods.aspx / AjaxGet？{％20％27id％27％20：％20％27li1234％27}
作为响应的一部分，它返回页面web方法的html。
任何帮助将不胜感激。
回答：
在我能说的一切之前，您选择的不是最简单的方法。ScriptMethods易于与ASP.NET
ScriptManager一起使用，而不与jQuery一起使用。我建议您最好使用启用JSON的WCF
HTTP服务（最好是RESTfull服务），而不要使用现在尝试使用的ASMX
Web服务。但是，可以使您的代码工作而无需在客户端使用任何Microsoft技术。
首先验证服务器端。
- 将webmethods.aspx重命名为webmethods.asmx。
确认您放置在\里面，并且配置中还存在一个用于asmx扩展的httpHandlers（ScriptHandlerFactory）：
<configuration>验证是否为从System.Web.Services.WebService继承的类设置了[ScriptService]属性（如果喜欢全名，则为[System.Web.Script.Services.ScriptService]）。
现在您可以测试服务了。在您的Web浏览器URL中打开，例如http：//localhost/webmethods.asmx/AjaxGet？id =
li1234 如果收到类似
<?xml version="1.0" encoding="utf-8" ?>
<string xmlns="http://tempuri.org/">li1234</string>
您可以确定您维修的零件工作正常。
如果“ Content-Type：application / json;”，则独立于“ ResponseFormat =
System.Web.Script.Services.ResponseFormat.Json”为服务应答赋予XML响应 未在请求中设置。
现在，我们将修复客户端代码。我希望我在以下代码中添加的注释能够全部解释。
再说一句。在代码的最后一部分，我调用了另一个“复杂”的web方法：
[WebMethod][ScriptMethod (UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
public OutputData AjaxGetMore (InputData input) {
return new OutputData () {
id = input.id,
message = "it's work!",
myInt = input.myInt+1
};
}
哪里
public class OutputData { public string id { get; set; }
public string message { get; set; }
public int myInt { get; set; }
}
public class InputData {
public string id { get; set; }
public int myInt { get; set; }
}
现在只有在某些地方使用JSON插件的JavaScript代码，如果有人喜欢的话，可以用Crockford的json2.js替换。
var id = "li1234";// version 1 - works
var idAsJson = '"' + id + '"'; // string serializes in JSON format
$.ajax({
type: "GET",
url: "/webmethods.asmx/AjaxGet?id=" + idAsJson,
contentType: "application/json; charset=utf-8",
success: function(msg) {
alert(msg.d); // var msg = {d: "li1234"}
},
error: function(res, status) {
if (status ==="error") {
// errorMessage can be an object with 3 string properties: ExceptionType, Message and StackTrace
var errorMessage = $.parseJSON(res.responseText);
alert(errorMessage.Message);
}
}
});
// version 2 with respect of JSON plugin
$.ajax({
type: "GET",
url: "/webmethods.asmx/AjaxGet?id=" + $.toJSON(id),
contentType: "application/json; charset=utf-8",
success: function(msg) {
alert(msg.d); // var msg = {d: "li1234"}
},
error: function(res, status) {
if (status ==="error") {
// errorMessage can be an object with 3 string properties: ExceptionType, Message and StackTrace
var errorMessage = $.parseJSON(res.responseText);
alert(errorMessage.Message);
}
}
});
// version 3 where jQuery will construct URL for us
$.ajax({
type: "GET",
url: "/webmethods.asmx/AjaxGet",
data: {id: $.toJSON(id)},
dataType: "json",
contentType: "application/json; charset=utf-8",
success: function(msg) {
alert(msg.d); // var msg = {d: "li1234"}
},
error: function(res, status) {
if (status ==="error") {
// errorMessage can be an object with 3 string properties: ExceptionType, Message and StackTrace
var errorMessage = $.parseJSON(res.responseText);
alert(errorMessage.Message);
}
}
});
// version 4. We set "Content-Type: application/json" about our data, but we use no
// not 'dataType: "json"' parameter. Then we have "Accept: */*" in the request
// instead of "Accept: application/json, text/javascript, */*" before.
// Everithing work OK like before.
$.ajax({
type: "GET",
url: "/webmethods.asmx/AjaxGet",
data: {id: $.toJSON(id)},
contentType: "application/json; charset=utf-8",
success: function(msg) {
alert(msg.d); // var msg = {d: "li1234"}
},
error: function(res, status) {
if (status ==="error") {
// errorMessage can be an object with 3 string properties: ExceptionType, Message and StackTrace
var errorMessage = $.parseJSON(res.responseText);
alert(errorMessage.Message);
}
}
});
// version 5. If we don't place "Content-Type: application/json" in our reqest we
// receive back XML (!!!) response with "HTTP/1.1 200 OK" header and
// "Content-Type: text/xml; charset=utf-8" which will be placed.
// How one can read in
// http://weblogs.asp.net/scottgu/archive/2007/04/04/json-hijacking-and-how-asp-net-ajax-1-0-mitigates-these-attacks.aspx),
// ASP.NET AJAX will not make JSON serialized of response data for
// security reasons.
$.ajax({
type: "GET",
url: "/webmethods.asmx/AjaxGet",
data: {id: $.toJSON(id)},
dataType: "json",
//contentType: "application/json; charset=utf-8",
success: function(msg) {
alert(msg.d); // var msg = {d: "li1234"}
},
error: function (res, status, ex) {
// the code here will be works because of error in parsing server response
if (res.status !== 200) { // if not OK
// we receive exception in the next line, be
var errorMessage = $.parseJSON(res.responseText);
alert(errorMessage.Message);
} else {
alert("status=" + status + "\nex=" + ex + "\nres.status=" + res.status + "\nres.statusText=" + res.statusText +
"\nres.responseText=" + res.responseText);
}
}
});
// version 6. Send more komplex data to/from the service
var myData = { id: "li1234", myInt: 100}
$.ajax({
type: "GET",
url: "/webmethods.asmx/AjaxGetMore",
data: {input:$.toJSON(myData)},
dataType: "json",
contentType: "application/json; charset=utf-8",
success: function(msg) {
// var msg = {__type: "Testportal.OutputData", id: "li1234", message: "it's work!", myInt:101}
alert("message=" + msg.d.message + ", id=" + msg.d.id + ", myInt=" + msg.d.myInt);
},
error: function(res, status) {
if (status ==="error") {
// errorMessage can be an object with 3 string properties: ExceptionType, Message and StackTrace
var errorMessage = $.parseJSON(res.responseText);
alert(errorMessage.Message);
}
}
});
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