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write a RadContextMenu control error

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This is a migrated thread and some comments may be shown as answers.

tother asked on 09 Apr 2010, 12:46 PM

Hi!

I'm trying to write a context menu control,for the reason to add context menu item dynamically!I wrote a web form page to invoke the control radcontextmenu.but when i click the href,I get a error:"Microsoft JScript runtime error: Object doesn't support this property or method"
web form page:

    
            <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm4.aspx.cs" Inherits="WebApplication1.WebForm4" %> 
        
            <%@ Register TagPrefix="CM" TagName="contextmenu" Src="~/contextmenu.ascx" %> 
        
            <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %> 
        
            <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
        
            <html xmlns="http://www.w3.org/1999/xhtml">  
        
            <head runat="server">  
        
                <title></title>  
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server">  
        
                <script type="text/javascript">  
        
                //<![CDATA[ 
        
                function popupMenu(item, e) { 
        
                    window.<%=contex1.ClientID%>.ShowContextMenu(item, e); 
        
                } 
        
                //]]> 
        
                </script> 
        
                <telerik:RadScriptManager ID="ScriptManager1" runat="server" /> 
        
                <div> 
        
                    <CM:contextmenu ID="contex1" runat="server" /> 
        
                    <a onclick="popupMenu(this, event)">Click here!</a> 
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

web control form(contextmenu.ascx)

    
            <%@ Control Language="C#" AutoEventWireup="true" CodeBehind="contextmenu.ascx.cs" Inherits="WebApplication1.contextmenu" %> 
        
            <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %> 
        
            <Telerik:RadContextMenu id="RadContextMenu1" 
        
                            runat="server" > 
        
                <Items> 
        
                    <Telerik:RadMenuItem Text="Trees" /> 
        
                    <Telerik:RadMenuItem Text="Sunset" /> 
        
                    <Telerik:RadMenuItem Text="Mountains" /> 
        
                </Items> 
        
            </Telerik:RadContextMenu>

web control form cs(contextmenu.ascx.cs)

    
            using System;  
        
            using System.Collections.Generic;  
        
            using System.Web;  
        
            using System.Web.UI;  
        
            using System.Web.UI.WebControls;  
        
            namespace WebApplication1  
        
            {  
        
                public partial class contextmenu : System.Web.UI.UserControl  
        
                {  
        
                    protected void Page_Load(object sender, EventArgs e)  
        
                    {  
        
                    }  
        
                    protected override void OnPreRender(EventArgs e)  
        
                    {  
        
                        if (!this.Page.IsClientScriptBlockRegistered(this.GetType().FullName))  
        
                            this.Page.RegisterClientScriptBlock(this.GetType().FullName, string.Format("<script type=\"text/javascript\" src=\"{0}\"></script>", this.ResolveUrl("~/ContextMenu.js")));  
        
                        if (!Page.IsClientScriptBlockRegistered(this.ClientID))  
        
                            Page.RegisterStartupScript(this.ClientID, String.Format("<script language=javascript>window.{0} = new ContextMenu('{0}', {1});</script>", this.ClientID, this.RadContextMenu1.ClientID));  
        
                        base.OnPreRender(e);  
        
                    }  
        
                }  
        
            }

contextmenu.js

    
            function ContextMenu(name, contextMenu) {  
        
                this.Name = name;  
        
                this.ContextMenuHandle = contextMenu;  
        
                this.ShowContextMenu = function() {  
        
                    this.ContextMenuHandle.show(arguments[1]); //(the JScript error ) 
        
                }  
        
            }

Any idea about what is wrong?

Thanks.

1 Answer, 1 is accepted

answered on 14 Apr 2010, 01:25 PM

radcontextmenuerror.zip

Hello tother,

I guess you are using this help topic as a reference.

However in your case you place the RadContextMenu in a User Control. To be able to find the RadContextMenu in Default.aspx page you'll have to subscribe to the OnClientLoad event to get the menu as a global variable:

<Telerik:RadContextMenu id="RadContextMenu1"

runat="server" OnClientLoad="load" >

<Items>

<Telerik:RadMenuItem Text="Trees" />

<Telerik:RadMenuItem Text="Sunset" />

<Telerik:RadMenuItem Text="Mountains" />

</Items>

</Telerik:RadContextMenu>

<script type="text/javascript">

var menu;

function load(sender, e)

{

menu = sender;

}

</script>

After that you may use the code from the help topic to the Default page but assign contextMenu to the global menu variable like this:

<script type="text/javascript">

function showMenu(e) {

var contextMenu = menu;

if ((!e.relatedTarget) || (!$telerik.isDescendantOrSelf(contextMenu.get_element(), e.relatedTarget))) {

contextMenu.show(e);

}

$telerik.cancelRawEvent(e);

}

</script>

Find the full code in the attached .zip file.

Hope this helps.

Regards,
Veronica Milcheva
the Telerik team

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