vb .net ajax call: unknown web method

Question

I have seen a few other posts with this error, but I have tried everything suggested in those and am still having an issue.

Here is my webMethod (and class):

<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 UPSImportWebServices
    Inherits System.Web.Services.WebService

    <ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _
    <WebMethod()> _
    Public Shared Function GetInvoiceItems(ByVal invoiceId As Integer) As List(Of UPSInvoiceItem)
        Return UPSInvoiceDataAccess.getInvoiceItems(invoiceId)
    End Function

End Class

I just call this on document ready:

$(document).ready(function () {
    $.ajax({
        type: "POST",
        url: '<%=ResolveUrl("~/UPSImportWebServices.asmx/GetInvoiceItems") %>',
        data: { invoiceID: "22" },
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (data) {
            alert('worked' + data)
        },
        error: function (response) {
            alert('error: ' + response.responseText);
        },
        failure: function (response) {
            alert('failure: ' + response.responseText);
        }
    });
});

This gives me the error: Unknown web method GetInvoiceItems. Parameter name: methodname.

EDIT: Changed invoiceID: "22" to invoiceID: 22. Still having the same issue.

PFranchise · Accepted Answer · 2013-05-29 16:22:04Z

2

I think I figured out the issue. I had copied an existing .asmx file rather than creating a new one. When I went to the url site.com/UPSImportWebServices.asmx, it showed the functions for the web service I copied. I deleted that .asmx file and created a new one and then copied my old code. It is working now.

Also, changed to '{ invoiceId:' + 22 + '}'. Note the ' and the capitalization. Rookie mistakes on this one.

answered May 29, 2013 at 16:22

PFranchise

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1 Comment

Brad M Over a year ago

Use JSON.stringify instead of manually constructing a JSON string; it's cleaner and modular.

jason · Accepted Answer · 2013-05-29 16:06:49Z

1

Well, i think this might have to do with the type of variable you are passing. GetInvoiceItems is expecting an integer, you are passing it a string. Try doing changing this

data: { invoiceID: "22" },

to this:

data: { invoiceID: 22 },

and let me know if that works or not. If not, we can move to the next possibility.

Try changing this:

url: '<%=ResolveUrl("~/UPSImportWebServices.asmx/GetInvoiceItems") %>',

to this:

 url: 'UPSImportWebServices.asmx/GetInvoiceItems',

and make sure the spelling of your asmx file is correct (case sensitive)

and lastly, try making your method just Public, not Public Shared.

answered May 29, 2013 at 16:06

jason

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5 Comments

PFranchise Over a year ago

Good catch. I made that change, but am still having the same issue.

jason Over a year ago

I edited my response to try a few more things. let me know if it still fails

PFranchise Over a year ago

Thanks again, but still having the same issue after making those additional changes.

jason Over a year ago

Do you know how to use the web console in FireFox? This should show you an error. Run your app with the console open and let me know what the error is.

PFranchise Over a year ago

I think I figured out the issue. I had copied an existing .asmx file rather than creating a new one. When I went to the url site.com/UPSImportWebServices.asmx, it showed the functions for the web service I copied. I deleted that .asmx file and created a new one and then copied my old code. It is working now. Thanks for the help and sorry for having wasted your time.

Brad M · Accepted Answer · 2013-05-29 16:21:14Z

1

Try doing this.

data: JSON.stringify({ invoiceId: 22 })

The webservice expects a JSON string.

Also, parameters are case sensitive. Your "D" in "invoiceID" is capitalized whereas the web method expects it to be "invoiceId" (lowercase d).

edited May 29, 2013 at 16:21

answered May 29, 2013 at 16:15

Brad M

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