阿贾克斯jQuery的asp.net错误的意外标记＆LT;

问题描述

我无法将Ajax功能添加到现有的asp.net 4的网站。我都一直在aspx页面创建的WebMethod，也尝试过ASMX，但在这两种情况下，我得到这个错误意外标记＆LT;

这是我的jQuery的：

功能postAssets（datapm）{

  $。阿贾克斯（{
            键入：POST，
            超时：20000，
            tryCount：0，
            retryLimit：10，
            网址：talk.asmx / HelloWorld的，
            数据： {}，
            的contentType：应用/ JSON的;字符集= UTF-8，
            数据类型：JSON，
            成功：函数（MSG）{
                的console.log（'成功postAssets'+ msg.d）;
            }，
            完成：功能（jqXHR，状态）{
                如果（状态=='成功'||地位=='notmodified'）{

                    的console.log（'完整postAssets'+ jqXHR.responseText）;
                }
            }，
            错误：函数（REQ，状态，错误）{

                的console.log（错误postAssets'）;
            }
        }）;
    }
 

这就是在ASMX：

 使用系统;
使用System.Collections.Generic;
使用System.Linq的;
使用的System.Web;
使用System.Web.Services;

///＆LT;总结＆gt;
///摘要说明谈话
///＆LT; /总结＆gt;
[WebService的（命名空间=htt​​p://tempuri.org/）]
[WebServiceBinding（ConformsTo = WsiProfiles.BasicProfile1_1）
//要允许此Web服务从脚本调用，使用ASP.NET AJAX，取消注释以下行。
// [System.Web.Script.Services.ScriptService]
公共类谈话：System.Web.Services.WebService {

    公开讲​​座（）{

        //取消注释以下行，如果使用设计的组件
        //的InitializeComponent（）;
    }

    [WebMethod的]
    公共字符串的HelloWorld（）{
        返回的Hello World;
    }

}
 

我不知道是否我缺少任何webconfig项目，或者是这一切在asp.net 4内置的？

 ＆lt;结构＆GT;
  ＆LT;的ConnectionStrings /＆GT;
  ＆LT;的System.Web＆GT;
    ＆LT;编译调试=真正的targetFramework =4.0/＆GT;
    ＆LT; machineKey中的validationKey =BA5B68AB87AAEA30753960733E796568decryptionKey =FAF15E4015737A7695D9761验证=SHA1/＆GT;
    ＆LT;身份验证模式=窗口/＆GT;
  ＆LT; /system.web>
  ＆LT; system.webServer＆GT;
    ＆LT;模块runAllManagedModulesForAllRequests =真/＆GT;
  ＆LT; /system.webServer>
＆LT; /结构＆gt;
 

解决方案

您返回JSON或标记？你调用jQuery的阿贾克斯（）方法需要JSON但是如果你返回的标记，与启动＆LT; 性格那么我能想象它抛出的异常。

I am having trouble adding ajax functionality to existing asp.net 4 website.I have both tried creating webmethod in the aspx page and also tried asmx, but in both cases I get this error Unexpected token <

this is my jQuery:

function postAssets(datapm) {

        $.ajax({
            type: "POST",
            timeout: 20000,
            tryCount: 0,
            retryLimit: 10,
            url: "talk.asmx/HelloWorld",
            data: "{}",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (msg) {
                console.log('success postAssets '+msg.d);
            },
            complete: function (jqXHR, status) {
                if (status == 'success' || status == 'notmodified') {

                    console.log('complete postAssets' + jqXHR.responseText);
                }
            },
            error: function (req, status, error) {

                console.log('error postAssets');
            }
        });
    }

and this is what is in asmx:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;

/// <summary>
/// Summary description for talk
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
// [System.Web.Script.Services.ScriptService]
public class talk : System.Web.Services.WebService {

    public talk () {

        //Uncomment the following line if using designed components
        //InitializeComponent();
    }

    [WebMethod]
    public string HelloWorld() {
        return "Hello World";
    }

}

I wonder if I am missing any webconfig items, or is it all built in in asp.net 4?

<configuration>
  <connectionStrings />
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
    <machineKey validationKey="BA5B68AB87AAEA30753960733E796568" decryptionKey="FAF15E4015737A7695D9761" validation="SHA1" />
    <authentication mode="Windows" />
  </system.web>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true" />
  </system.webServer>
</configuration>

解决方案

Are you returning JSON or markup? Your call to jQuery's ajax() method is expecting JSON but if you're returning markup that starts with a < character then I could imagine it throwing that exception.

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