We have a Nevron control which is throwing a client-side error, "'NClientHost' is undefined."  In IE9 developer tools the offending line looks like this:

<div id='NThinDiagramControl1' style='margin:0;padding:0;overflow:visible;position:relative;font-size:0px;width:1400px;height:1000px'><script type='text/javascript'>{var host = new NClientHost($("div[id = 'NThinDiagramControl1']")[0],"NThinDiagramControlHttpHandler.axd","http://<<<WEB PAGE PATH SHOWS HERE>>>.aspx",new NDiagramCommandProcessor(),new NRect(0, 0, 1400, 999));;

var request = NRequest.GetUpdateScriptRequest();

host.ExecuteServiceRequest(request);

}<

Thus far we have checked the following things, and have been so far unable to determine the cause.

- Tried adding jQuery reference directly to the top of the page:  <script src="Scripts/jquery-1.8.2.min.js" type="text/javascript"></script>
- Tried leaving JQuery.SourceType setting as default (unset), "none", and "embedded" to no avail.
- Verified the handlers section in the web.config file as follows:

    <httpHandlers>
      <add path="NevronDiagram.axd" verb="*" type="Nevron.Diagram.WebForm.NDiagramImageResourceHandler" validate="false"/>
      <add path="NevronChart.axd" verb="*" type="Nevron.Chart.WebForm.NChartImageResourceHandler" validate="false"/>
      <add path="NevronScriptManager.axd" verb="*" type="Nevron.UI.WebForm.Controls.NevronScriptManager" validate="false"/>
      <add path="NThinDiagramControlHttpHandler.axd" verb="*" type="Nevron.Diagram.ThinWeb.NThinDiagramControlHttpHandler" validate="false"/>
      <add path="NAspNetThinWebControlHttpHandler.axd" verb="*" type="Nevron.ThinWeb.NAspNetThinWebControlHttpHandler" validate="false"/>
    </httpHandlers>

...

    <handlers>
      <!--If you are using Nevron Chart for .NET-->
      <remove name="NevronChart"/>
      <!--If you are using Nevron Diagram for .NET-->
      <remove name="NevronDiagram"/>
      <!--If you are using Nevron Chart for .NET-->
      <remove name="NevronScriptManager"/>
      <remove name="NThinDiagramControlHttpHandler"/>
      <remove name="NAspNetThinWebControlHttpHandler"/>
      <add name="NevronChart" preCondition="integratedMode" verb="*" path="NevronChart.axd" type="Nevron.Chart.WebForm.NChartImageResourceHandler"/>
      <!--If you are using Nevron Diagram for .NET-->
      <add name="NevronDiagram" preCondition="integratedMode" verb="*" path="NevronDiagram.axd" type="Nevron.Diagram.WebForm.NDiagramImageResourceHandler"/>
      <add name="NevronScriptManager" preCondition="integratedMode" verb="*" path="NevronScriptManager.axd" type="Nevron.UI.WebForm.Controls.NevronScriptManager"/>
      <add name="NThinDiagramControlHttpHandler" preCondition="integratedMode" verb="*" path="NThinDiagramControlHttpHandler.axd" type="Nevron.Diagram.ThinWeb.NThinDiagramControlHttpHandler"/>
      <add name="NAspNetThinWebControlHttpHandler" preCondition="integratedMode" verb="*" path="NAspNetThinWebControlHttpHandler.axd" type="Nevron.ThinWeb.NAspNetThinWebControlHttpHandler"/>
    </handlers>

We are curious how to resolve this issue or troubleshoot it any further.  Please advise, thanks!

-Chris

Hi,

For anyone this might help, my error was being caused by my C# code setting the .Visible property of the NThinDiagramControl to false.
What worked for me instead is wrapping the control inside a div tag, and then using jQuery to hide the div. There are probably other ways as well.

ASPX:

<div class="nevronPanel" >
  <nevron:nthindiagramcontrol runat="server" id="NThinDiagramControl1" Width="500px" Height="500px"></nevron:nthindiagramcontrol>
</div>

And in code-behind, register startup script similar to this if the control should not display: