javascript - $.ajax 不调用 ASP.Net 中的 WebService

Question

我尝试通过 jQuery 调用 Web 服务，但它没有显示任何结果或错误。我的代码是:

<script type="text/javascript" language="javascript">
    var empId = '<%= Session["UserName"] %>';
</script>
<script type="text/javascript"> 
    alert(empId);    
    $.ajax({ 
        type: "POST", 
        dataType: "json", 
        contentType: "application/json", 
        url: "ServiceGetUser.asmx/GetEmployee", 
        data: "{'employeeId': '" + empId + "'}", 
        success: function (data) { 
            alert("Employee name: " + data.d); 
        }, 
        error: function () { 
            alert("Error calling the web service.");  
        } 
    }); 
</script>

我从session获取一个值，成功打印它，然后将其传递给Web服务，并返回打印名称Jane Developer，如我的Web服务代码所示:

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;

namespace MentorMentee
{
    /// <summary>
    /// Summary description for ServiceGetUser
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
    // 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 ServiceGetUser : System.Web.Services.WebService
    {

        [WebMethod]
        public string GetEmployee(string employeeId)
        {
            return "Jane Developer";
        }
    }
}

问题出在哪里，希望得到您的建议

谢谢

Answer 1

您可以将其放入文档就绪 block :

$(window).load(function(){
   $.ajax({ 
      type: "POST", 
      dataType: "json", 
      contentType: "application/json", 
      url: "ServiceGetUser.asmx/GetEmployee", 
      data: {'employeeId': '<%= Session["UserName"] %>'}, //<-- try it
      success: function (data) { 
          alert("Employee name: " + data.d); 
      }, 
      error: function () { 
          alert("Error calling the web service.");  
      } 
    });
 });