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[Solved] Cannot get RadComboBox to work with MOSS2007

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markus asked on 19 Apr 2007, 03:12 PM

Hello,

I'm trying to use rad controls with MOSS 2007 but can't find installation instructions for it. I have developed a user control with RadComboBox that works fine in ASP.NET 2.0 when embedded in a master page.
Now when I deploy this user control to MOSS it throws the following error message:

[HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).]
   System.Web.UI.ControlCollection.Add(Control child) +2060559
   Telerik.RadComboboxUtils.RadControl.RegisterCssFile(String path) +192
   Telerik.RadComboboxUtils.RadControl.RenderRuntimeSkin() +64
   Telerik.RadComboboxUtils.RadControl.Page_PreRenderComplete(Object sender, EventArgs e) +10
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   System.Web.UI.Page.OnPreRenderComplete(EventArgs e) +2012676
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1566

I assume the error is caused by RadControl not finding a CSS file or something similar. Can you help with this? We are currently evaluating rad controls vs. NetAdvantage.

Regards,
Markus

7 Answers, 1 is accepted

answered on 19 Apr 2007, 03:20 PM

If you receive exceptions such as:

System.Web.HttpException: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)

you need to move the javascript code block outside of the head tag. For example:

Before:

<head runat="server">
    <script>
    var controlClientObject = <%= RadControl1.ClientID %>
    ...
    </script>
</head>

<body>
...
</body>

After:

<head runat=a?servera?>
</head>
<body>
    <script>
    var controlClientObject = <%= RadControl1.ClientID %>
    ...
    </script>
...
</body>

answered on 19 Apr 2007, 07:06 PM

Hello Mike,

No, I do not use CSJS in the header - at least not intentionally.

I was able to create a simple test case for my problem with rad controls and MOSS 2007:

1) download and install SmartPart v1.1 from http://www.gotdotnet.com/workspaces/workspace.aspx?id=6cfaabc8-db4d-41c3-8a88-3f974a7d0abe - you can find the link under Releases in the lower right hand page area.
2) create a user control RadControl.ascx with the following content:

<%@ Control Language="C#" AutoEventWireup="true" %>
<%@ Register Assembly="RadComboBox.Net2" Namespace="Telerik.WebControls" TagPrefix="radC" %>
<radC:RadComboBox ID="RadComboBox1" runat="server" SkinsPath="~/RadControls/ComboBox/Skins" Width="150px">
    <Items>
        <radC:RadComboBoxItem runat="server" Text="RadComboBoxItem1"></radC:RadComboBoxItem>
        <radC:RadComboBoxItem runat="server" Text="RadComboBoxItem2"></radC:RadComboBoxItem>
    </Items>
</radC:RadComboBox>

3) create a folder "usercontrols" in c:\Inetpub\wwwroot (or wherever your MOSS is installed) and copy RadControl.ascx into it.

4) copy RadCombobox.Net2.dll into c:\Inetpub\wwwroot\bin

5) Enable the Smartpart feature and create a Smartpart web part. Configure it to read the RadControl.ascx.

Step 5 is where I get the error message.

Regards,
Markus

answered on 19 Apr 2007, 09:11 PM

found out what causes the problem: Telerik.RadComboboxUtils.RadControl.RegisterCssFile() is like this:

private void RegisterCssFile(string path)
{
    if (!IsClientScriptBlockRegistered(path))
    {
        RegisterClientScriptBlock(path);
        if (!this.IsCssPathRegistered(path))
        {
            HtmlLink child = new HtmlLink();
            child.Attributes["type"] = "text/css";
            child.Attributes["rel"] = "stylesheet";
            child.Attributes["href"] = path;
            this.Page.Header.Controls.Add(child);
        }
    }
}

How can I set IsClientScriptBlockRegistered to true for the given CSS path?

Markus