write a RadContextMenu control error

2 posts, 0 answers
  1. tother
    tother avatar
    1 posts
    Member since:
    Dec 2006

    Posted 09 Apr 2010 Link to this post


    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">  
        <form id="form1" runat="server">  
        <script type="text/javascript">  
        function popupMenu(item, e) {
            window.<%=contex1.ClientID%>.ShowContextMenu(item, e);
        <telerik:RadScriptManager ID="ScriptManager1" runat="server" /> 
            <CM:contextmenu ID="contex1" runat="server" /> 
            <onclick="popupMenu(this, event)">Click here!</a> 
    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" > 
            <Telerik:RadMenuItem Text="Trees" /> 
            <Telerik:RadMenuItem Text="Sunset" /> 
            <Telerik:RadMenuItem Text="Mountains" /> 
    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));  
    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?

  2. Veronica
    Veronica avatar
    1213 posts

    Posted 14 Apr 2010 Link to this post

    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" >  
            <Telerik:RadMenuItem Text="Trees" />  
            <Telerik:RadMenuItem Text="Sunset" />  
            <Telerik:RadMenuItem Text="Mountains" />  
    <script type="text/javascript">
    var menu;
    function load(sender, e)
       menu = sender;

    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))) {

    Find the full code in the attached .zip file.

    Hope this helps.

    Veronica Milcheva
    the Telerik team

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