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[Solved] Disappearing context menu after downloading a file in radgrid

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Grid

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

Jakub Wilk asked on 09 Jun 2008, 10:09 AM

We have a problem witch context menu in RadGrid. After downloading a file context menu is disappearing. Only refreshing the page can fix the menu.

Code example:

    
            <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="RadGridMenu._Default" %> 
        
            <%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %> 
        
            <!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>Untitled Page</title> 
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server"> 
        
                <script type="text/javascript"> 
        
                function RowContextMenu(sender, eventArgs) 
        
                { 
        
                    var e = eventArgs.get_domEvent(); 
        
                    var index = eventArgs.get_itemIndexHierarchical(); 
        
                    document.getElementById('<%=hdnClickedRow.ClientID%>').value = index; 
        
                    menu = $find("<%=RadMenu1.ClientID%>"); 
        
                    menu.show(e); 
        
                    e.cancelBubble = true; 
        
                    e.returnValue = false; 
        
                    if (e.stopPropagation) 
        
                    { 
        
                       e.stopPropagation(); 
        
                       e.preventDefault(); 
        
                    } 
        
                } 
        
                </script> 
        
                <input type="hidden" id="hdnClickedRow" runat="server" /> 
        
                <telerik:RadScriptManager ID="RadScriptManager1" runat="server"> 
        
                </telerik:RadScriptManager> 
        
                <telerik:RadGrid ID="RadGrid1" runat="server"  onitemcommand="RadGrid1_ItemCommand"> 
        
                <MasterTableView> 
        
                    <Columns> 
        
                        <telerik:GridTemplateColumn> 
        
                            <ItemTemplate> 
        
                                <asp:LinkButton ID="lnkbtn" runat="server" Text="Download File" CommandName="someCMD" /> 
        
                            </ItemTemplate> 
        
                        </telerik:GridTemplateColumn> 
        
                    </Columns>        
        
                </MasterTableView>     
        
                <ClientSettings> 
        
                    <ClientEvents OnRowContextMenu="RowContextMenu" /> 
        
                    <Selecting AllowRowSelect="true" /> 
        
                </ClientSettings>     
        
                </telerik:RadGrid> 
        
                <telerik:RadContextMenu ID="RadMenu1" Runat="server" ContextMenuElementID="none"> 
        
                <Targets> 
        
                    <telerik:ContextMenuControlTarget ControlID="RadGrid1" /> 
        
                </Targets> 
        
                <Items> 
        
                    <telerik:RadMenuItem Text="abc abc abc" Value="abc abc abc1" /> 
        
                    <telerik:RadMenuItem Text="abc abc abc" Value="abc abc ab2c" /> 
        
                    <telerik:RadMenuItem Text="abc abc abc" Value="abc abc abc3" /> 
        
                    <telerik:RadMenuItem Text="abc abc abc" Value="abc abc abc4" /> 
        
                    <telerik:RadMenuItem Text="abc abc abc" Value="abc abc abc5" /> 
        
                </Items>     
        
                </telerik:RadContextMenu> 
        
                <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" /> 
        
                </form>     
        
            </body> 
        
            </html>

    
            using System; 
        
            using System.Collections; 
        
            using System.Configuration; 
        
            using System.Data; 
        
            using System.Linq; 
        
            using System.Web; 
        
            using System.Web.Security; 
        
            using System.Web.UI; 
        
            using System.Web.UI.HtmlControls; 
        
            using System.Web.UI.WebControls; 
        
            using System.Web.UI.WebControls.WebParts; 
        
            using System.Xml.Linq; 
        
            using System.IO; 
        
            using System.Text; 
        
            namespace RadGridMenu 
        
            { 
        
                public partial class _Default : System.Web.UI.Page 
        
                { 
        
                    protected void Page_Load(object sender, EventArgs e) 
        
                    { 
        
                        if (!IsPostBack) 
        
                        { 
        
                            RadGrid1.DataSource = Enumerable.Range(0, 10); 
        
                            RadGrid1.DataBind(); 
        
                        } 
        
                    } 
        
                    private void DownaloadFile()  
        
                    { 
        
                        string fileToDownload = Path.Combine(Server.MapPath("."), "aaa.txt"); 
        
                        using (FileStream oFile = new FileStream(fileToDownload, FileMode.Open)) 
        
                        { 
        
                            HttpContext.Current.Response.Clear(); 
        
                            HttpContext.Current.Response.ContentType = "text/html"; 
        
                            HttpContext.Current.Response.HeaderEncoding = Encoding.Default; 
        
                            HttpContext.Current.Response.AddHeader("Content-disposition", "attachment; filename=file.txt"); 
        
                            using (BinaryReader br = new BinaryReader(oFile)) 
        
                            { 
        
                                byte[] buff = new byte[51200]; 
        
                                int numOfRead = 0; 
        
                                while ((numOfRead = br.Read(buff, 0, buff.Length)) > 0) 
        
                                { 
        
                                    HttpContext.Current.Response.OutputStream.Write(buff, 0, numOfRead); 
        
                                } 
        
                            } 
        
                            HttpContext.Current.Response.End(); 
        
                        } 
        
                    } 
        
                    protected void RadGrid1_ItemCommand(object source, Telerik.Web.UI.GridCommandEventArgs e) 
        
                    { 
        
                        if (e.CommandName == "someCMD") 
        
                        { 
        
                            DownaloadFile(); 
        
                        } 
        
                    } 
        
                    protected void Button1_Click(object sender, EventArgs e) 
        
                    { 
        
                        DownaloadFile(); 
        
                    } 
        
                } 
        
            }

What can we do to fix it?
Nowicki Sebastian

[Solved] Disappearing context menu after downloading a file in radgrid

2 Answers, 1 is accepted