I am currently developing a module for DotNetNuke 4.3.5, and trying to use the Client API. I have duplicated the HelloAjax ascx and javascript file as in the example. I am getting a fast array of spurious errors, dependand on how much I duplicate the code. If I remove the the lines;

If ClientAPI.BrowserSupportsFunctionality(ClientAPI.ClientFunctionality.XMLHTTP) _
             AndAlso ClientAPI.BrowserSupportsFunctionality(ClientAPI.ClientFunctionality.XML) Then
                ClientAPI.RegisterClientReference(Me.Page, ClientAPI.ClientNamespaceReferences.dnn_xml)
                ClientAPI.RegisterClientReference(Me.Page, ClientAPI.ClientNamespaceReferences.dnn_xmlhttp)

End If

I get the Cast Error others have reported, when included 404 Control Not Found error. But when logged in as a subscriber, portal admin or host it all works fine.

Here is the ascx file

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="SearchHBJobs.ascx.vb" Inherits="HiBrowWeb.Modules.HBJobs.SearchHBJobs" %>
<asp:label id="Label1" runat="server">Enter Text</asp:label><br>
<asp:textbox id="TextBox1" runat="server"></asp:textbox><br>
<INPUT id="Button1" type="button" value="Invoke AJAX Method" name="Button1" runat="server">
<INPUT id="chkContinuous" type="checkbox" name="chkContinuous" runat="server">&nbsp;Continuous&nbsp;<BR>

Here is the vb file

Imports DotNetNuke
Imports DotNetNuke.UI.Utilities

Imports System
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls


Namespace HiBrowWeb.Modules.HBJobs
    Partial Class SearchHBJobs
        Inherits Entities.Modules.PortalModuleBase
        Implements Entities.Modules.IActionable
        Implements IClientAPICallbackEventHandler
#Region "Private Members"
#End Region
#Region "Event Handlers"
       
        Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
            ''these won't be necessary in next release after 3.2.0
            'If ClientAPI.BrowserSupportsFunctionality(ClientAPI.ClientFunctionality.XMLHTTP) _
            '  AndAlso ClientAPI.BrowserSupportsFunctionality(ClientAPI.ClientFunctionality.XML) Then
            '    ClientAPI.RegisterClientReference(Me.Page, ClientAPI.ClientNamespaceReferences.dnn_xml)
            '    ClientAPI.RegisterClientReference(Me.Page, ClientAPI.ClientNamespaceReferences.dnn_xmlhttp)

            'Only this line will be necessary after 3.2
            Me.Button1.Attributes.Add("onclick", ClientAPI.GetCallbackEventReference(Me, "dnn.dom.getById('" & Me.TextBox1.ClientID & "').value", "successFunc", "'" & Me.ClientID & "'", "errorFunc"))
            Me.chkContinuous.Attributes.Add("onclick", "toggleCont('" & Me.ClientID & "')")

            If Me.Page.ClientScript.IsClientScriptBlockRegistered("helloajax.js") = False Then
                Me.Page.ClientScript.RegisterClientScriptBlock(Me.GetType, "helloajax.js", "<script language=javascript src=""" & Me.ModulePath & "helloajax.js""></script>")
            End If

            'End If

        End Sub
#End Region
#Region "Optional Interfaces"
        ''' -----------------------------------------------------------------------------
        ''' <summary>
        ''' Registers the module actions required for interfacing with the portal framework
        ''' </summary>
        ''' <value></value>
        ''' <returns></returns>
        ''' <remarks></remarks>
        ''' <history>
        ''' </history>
        ''' -----------------------------------------------------------------------------
        Public ReadOnly Property ModuleActions() As Entities.Modules.Actions.ModuleActionCollection Implements Entities.Modules.IActionable.ModuleActions
            Get
                Dim Actions As New Entities.Modules.Actions.ModuleActionCollection
                Actions.Add(GetNextActionID, Localization.GetString(Entities.Modules.Actions.ModuleActionType.AddContent, LocalResourceFile), Entities.Modules.Actions.ModuleActionType.AddContent, "", "", EditUrl(), False, Security.SecurityAccessLevel.Edit, True, False)
                Return Actions
            End Get
        End Property


        Protected Function RaiseClientAPICallbackEvent(ByVal EventArgs As String) As String _
            Implements IClientAPICallbackEventHandler.RaiseClientAPICallbackEvent
            Return "Hello: " & EventArgs
        End Function
#End Region
    End Class
End Namespace


And JS file

function successFunc(result, ctx)
{
    if (dnn.dom.getById(ctx + '_chkContinuous').checked)
    {
        dnn.dom.getById(ctx + '_Label1').innerHTML = result;
        dnn.doDelay(ctx, 1000, doCont, ctx);
    }
    else
        alert('result: ' + result + '\ncontext:' + ctx);
}

function doCont(ns)
{
    dnn.dom.getById(ns + '_Button1').onclick();
}

function errorFunc(result, ctx)
{
    alert(result);
}

function toggleCont(ns)
{
    if (dnn.dom.getById(ns + '_chkContinuous').checked)
        doCont(ns);
}


The most curiouse thing is, as is the HelloAjax module works absolutly fine. Also just a bit of background the module was originally generated by the DotNetNuke Starter Kit.

Additionally I have tested another suggestion on this forum, of diabling the caching for the module. This did not solve my issue.

Thanks to anyone that can help.