Internal server error in jquery /json webmethod

**ERUM** · Dec 27th, 2012, 05:45 AM

hi to all

I have following code in webservice

Code:

[WebMethod]
        public string  Records(string loginid,string pass)
        {

            //if (loginid == "Admin")
            //{
            //    return "Exist";
            //}

            return "";

            //else
            //{
            //    return "Not Exist";
            //}
            //DataTable dt = new DataTable("MyDataTable");
            //dt.Columns.Add("column1", typeof(System.String));
            //dt.Columns.Add("column2", typeof(System.String));

            //DataRow dr = dt.NewRow();
            //dr["column1"] = "Your Data";
            //dr["column2"] = "Your Data";
            //dt.Rows.Add(dr);

            //dr = dt.NewRow();
            //dr["column1"] = "Your Data";
            //dr["column2"] = "Your Data";
            //dt.Rows.Add(dr);

            //return dt;

        }

and.aspx page is like this

Code:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Params.aspx.cs" Inherits="JQueryAjax.Params" %>

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

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<style type="text/css">
.loading {  background-image: url('ajax-loader.gif');  background-repeat: no-repeat; } 

   

</style>
    <title></title>
    <script src="jquery.js" type="text/javascript"></script>
    <script type="text/javascript">
    function CallService() {     
    $("#lblResult").addClass("loading");  
    $.ajax({    
    type: "POST",
    url: "MyService.asmx/HelloWorld",
    data: "{}",  
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: Success, 
    error: Error     
    });     }   
      function Success(data, status) {      
       $("#lblResult").removeClass("loading"); 
       $("#lblResult").html(data.d);   
         }     
           function Error(request, status, error) 
           {        
            $("#lblResult").removeClass("loading");
            $("#lblResult").html(request.statusText); 
            }
            
     function CallService1() {
            
     $.ajax({   
     type: "POST",
     url: "MyService.asmx/Add",  
     data: "{ 'value1': " + $("#txtValue1").val() + ", 'value2': " + $("#txtValue2").val() + "}",
      contentType: "application/json; charset=utf-8",  
      dataType: "json",     
      success: OnSuccess,
      error: OnError   
      });     } 
      
      function OnSuccess(data, status) {   
      $("#lblResult").html(data.d); 
       } 
       function OnError(request, status, error) { 
       $("#lblResult").html(request.statusText);     
       } 
       
       
         function CallService2() {
              $("#lblResult").addClass("loading");
     $.ajax({   
     type: "POST",
     url: "MyService.asmx/Records",  
     data: "{ 'value1': " + $("#txt_login").val() + ", 'value2': " + $("#txt_pass").val() + "}",
      contentType: "application/json; charset=utf-8",  
      dataType: "json",     
      success: OnSuccess,
      error: OnError   
      });     } 
      
      function OnSuccess(data, status) {   
       $("#lblResult").removeClass("loading"); 
       $("#lblResult").html(data.d); 
       } 
       function Error(request, status, error) 
           {        
            $("#lblResult").removeClass("loading");
            $("#lblResult").html(request.statusText); 
            }
       
       
    </script> 
    
    

</head>
<body>
    <form id="form1" runat="server">
        <div>
            <table>
                <tbody>
                    <tr>
                        <th>
                            Value 1: 
                        </th>
                        <td>
                            <asp:TextBox ID="txtValue1" runat="server" />
                        </td>
                    </tr>
                    <tr>
                        <th>
                            Value 2: 
                        </th>
                        <td>
                            <asp:TextBox ID="txtValue2" runat="server" />
                        </td>
                    </tr>
                </tbody>
            </table>
        
            <asp:Button ID="btnGo" Text="Hello World" OnClientClick="CallService(); return false;" runat="server" />
            <asp:Button ID="Button1" Text="Add" OnClientClick="CallService1(); return false;" runat="server" />
             
            
            <asp:Label ID="lblResult" Text="&nbsp;" Width="100%" runat="server" />
            <asp:Label ID="lblRecords" Text="&nbsp;" Width="100%" runat="server" />
            
            
            
        </div>
        <table class="style1">
            <tr>
                <td>
                    Login ID</td>
                <td>
                    <asp:TextBox ID="txt_login" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td>
                    Password</td>
                <td>
                    <asp:TextBox ID="txt_pass" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td>
                    &nbsp;</td>
                <td>
                   <asp:Button ID="Button3" Text="Login check" OnClientClick="CallService2(); return false;" runat="server" />
                </td>
            </tr>
        </table>
    </form>
</body>
</html>

and when i click on Button3(after providing loginid and password ) it gives me an error "Internal Server Error"

Please reply ..any urgent reply would be good enough

Thanks

**wakawaka** · Jan 25th, 2013, 04:04 PM

What does the Windows Log say?

**tr333** · Jan 28th, 2013, 01:04 AM

This should be in the ASP.NET Forum (mods?).

Your method signature is

Code:

Records(string loginid,string pass)

but you are trying to call it as

Code:

Records()

Note the missing parameters that aren't being sent from your jQuery code.

You are currently sending a single unnamed string as the data, and so jQuery has no idea what to do with it. When the request reaches ASP.NET, that also has no idea what to do with it as the request is for

Code:

Records("{}")

and nothing matches that request, hence the Internal Server Error. You would have picked this up if you had run the project in debug mode from Visual Studio.

If you check the relevant jQuery documentation for $.ajax(), you will see that the data parameter can be a string or an object. The string parameter would only apply if your string is already in query-string format. It isn't, so you will want to send an object as the data parameter value which will then get converted by jQuery into the appropriate query-string format. An object would be specified with braces (as you already had), but without the surrounding quotes that turn it into a string.

The "Records" method is expecting two strings in the querystring, "loginid" and "pass", so you will need to specify them both in the data parameter.

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