Question

JavaScript:

 var paramStr =  $('#id1').val() + '|' + $('#id2').val() + '|' +  $('#id3').val();
    paramStr = '{"searchCriteria": "' + paramStr + '"}';

    $.ajax({
      type: "POST",
      url: "/MyService.asmx/MyWebMethod",
      data: paramStr,
      contentType: "application/json; charset=utf-8",
      dataType: "json",
      success: function(result) {

      }
    });

VB.NET:

<System.Web.Script.Services.ScriptService()> _
<System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _
<System.Web.Services.WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<ToolboxItem(False)> _
Public Class LogisticsMainMenuService
  Inherits System.Web.Services.WebService

      <WebMethod(EnableSession:=True)> _
      <ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _
      Public Function MyWebMethod(ByVal searchCriteria As String) As String
        Dim dummy as Integer = 1
        .
        .
        Return someResult
      End Function
End Class

I put a break point inside MyWebMethod. When I invoke this call on the page, the break point never gets hit. It works fine when I remove all parameters from MyWebMethod’s signature and pass in ‘{}’ from JS as parameters. Once I try to pass in a string parameter, it stops working.

Answer 1

Ok! After seriously banging my head on the keyboard and picking up some extra FireBug skills, I got my problem solved.

url: “/MyService.asmx/MyWebMethod”,

should be

url: “MyService.asmx/MyWebMethod”,

without the first “/”.
Apparently, the first call is going to http://www.mysite.com/MyService.asmx as oppose http://www.mysite.com/dir/MyService.asmx even if making the call from within /dir… which I did.
Happy AJAXing, everybody!