Question

The following code executes properly when the data key has no data to send, i.e. data: ‘{}’ an empty JSON object and the webservice takes no parameters. I would like to post some data to the webservice but I am running into trouble.

When I try to set this to data:'{‘name’:’Niall’,’surname’:’Smith’}’, I get an error

{'Message':'Invalid web service call, missing value for parameter: \u0027json\u0027.','StackTrace':'   at System.Web.Script.Services.WebServiceMethodData.CallMethod(Object target, IDictionary`2 parameters)\r\n   at System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)\r\n   at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary`2 rawParams)\r\n   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)','ExceptionType':'System.InvalidOperationException'} 

The webservice is not executed.

This is my Jquery call to post my data back to the server.

    $.ajax({         type: 'POST',         url: '/WebServices/BasketServices.asmx/AddItemToBasket',         data: '{'name':'niall'}', // Is this Correct??         contentType: 'application/json; charset=utf-8',         dataType: 'json',         success: OnItemAddedSuccess     }); function OnItemAddedSuccess(result,eventArgs) {     //deserialize the JSON and use it to update the Mini Basket     var response = JSON.parse(result.d); } 

here is my WebService

[WebService(Namespace = 'http://tempuri.org/')] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.ComponentModel.ToolboxItem(false)] [System.Web.Script.Services.ScriptService] public class BasketServices : System.Web.Services.WebService {     [WebMethod(true)]     public string AddItemToBasket(string json)     {        //do stuff        return myString.toJSON();     } } 

What could the problem be? Is it the format of the JSON data to be posted? Could it be that I haven’t set the correct Attributes on my WebService. What about the problems alluded to in Dave Ward’s post

I have tried everything I can think of. Does anyone have any ideas?

Answer 1

I think the webservice expects the parameter json to be set. Try this AJAX call :

var data = {'name':'niall'};  $.ajax({     type: 'POST',     url: '/WebServices/BasketServices.asmx/AddItemToBasket',     data: 'json=' + JSON.stringify(data),     contentType: 'application/json; charset=utf-8',     dataType: 'json',     success: OnItemAddedSuccess }); 

where JSON.stringify() is a method like the one found in the ‘official’ implementation : http://json.org/js.html