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Unable to download file using AsyncPostBackTrigger in RadGrid

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Grid

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

Dorababu asked on 25 Jan 2013, 04:23 PM

Hi all I am using RadGrid in my application, as I want my RadGrid not to refresh I had my RadGrid in an Update Panel as follows

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">

<Triggers>

<asp:AsyncPostBackTrigger ControlID="RadGrid1" EventName="ItemCommand" />

<%--<asp:PostBackTrigger ControlID="RadGrid1" />--%>

</Triggers>

<ContentTemplate>

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="false" OnItemCommand="RadGrid1_ItemCommand"

OnNeedDataSource="RadGrid1_NeedDataSource">

<MasterTableView Width="950" AutoGenerateColumns="false" DataKeyNames="EmpID" GridLines="None"

TableLayout="Auto">

<Columns>

<telerik:GridBoundColumn DataField="EmpID" HeaderText="Emp ID" ReadOnly="true" HeaderStyle-HorizontalAlign="Left"

ItemStyle-HorizontalAlign="Left" UniqueName="EmpID" FilterControlWidth="30px"

AutoPostBackOnFilter="true" CurrentFilterFunction="Contains" />

<telerik:GridButtonColumn DataTextField="ButtonName" ItemStyle-ForeColor="Blue" CommandName="Generate"

ConfirmTextFields="ButtonName" ConfirmTextFormatString="Would you like to {0} ACH file ?"

ConfirmDialogType="RadWindow" Reorderable="false" UniqueName="ButtonName" ConfirmTitle="ACH File">

</telerik:GridButtonColumn>

<telerik:GridBoundColumn DataField="EmployeeName" HeaderText="Employee Name" ReadOnly="true"

HeaderStyle-HorizontalAlign="Left" ItemStyle-HorizontalAlign="Left" UniqueName="EmployeeName"

FilterControlWidth="60px" AutoPostBackOnFilter="true" CurrentFilterFunction="Contains" />

</Columns>

</MasterTableView>

</telerik:RadGrid>

</ContentTemplate>

</asp:UpdatePanel>

When I click on download button I am unable to download the file this is my code in Itemcommand

protected void RadGrid1_ItemCommand(object sender, Telerik.Web.UI.GridCommandEventArgs e)

{

if (e.CommandName == "Generate")

{

Response.ContentType = "text/plain";

Response.AppendHeader("Content-Disposition", "attachment;filename= errorLog.txt");

Response.AddHeader("content-length", "0");

Response.Flush();

Response.End();

}

Can some one help me how can I work out this using AsyncPostBackTrigger

18 Answers, 1 is accepted

answered on 30 Jan 2013, 11:11 AM

Hello,

Please try with below code snippet.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GridWithEnum.aspx.cs" Inherits="GridWithEnum" %>

<!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">

<div>

<telerik:RadScriptManager ID="RadScriptManager1" runat="server">

</telerik:RadScriptManager>

<telerik:RadWindowManager ID="RadWindowManager1" runat="server">

</telerik:RadWindowManager>

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">

<ContentTemplate>

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="false" OnItemCommand="RadGrid1_ItemCommand"

OnNeedDataSource="RadGrid1_NeedDataSource" OnItemDataBound="RadGrid1_ItemDataBound">

<MasterTableView Width="950" AutoGenerateColumns="false" DataKeyNames="ID" GridLines="None"

TableLayout="Auto">

<Columns>

<telerik:GridBoundColumn DataField="ID" HeaderText="Emp ID" ReadOnly="true" HeaderStyle-HorizontalAlign="Left"

ItemStyle-HorizontalAlign="Left" UniqueName="ID" FilterControlWidth="30px" AutoPostBackOnFilter="true"

CurrentFilterFunction="Contains" />

<telerik:GridButtonColumn DataTextField="Name" ItemStyle-ForeColor="Blue" CommandName="Generate"

ConfirmTextFields="Name" ConfirmTextFormatString="Would you like to {0} ACH file ?"

ConfirmDialogType="RadWindow" Reorderable="false" UniqueName="ButtonName" ConfirmTitle="ACH File">

</telerik:GridButtonColumn>

</Columns>

</MasterTableView>

</telerik:RadGrid>

</ContentTemplate>

</asp:UpdatePanel>

</div>

</form>

</body>

</html>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using Telerik.Web.UI;

using System.Data;

public partial class GridWithEnum : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)

{

dynamic data = new[] {

new { ID = 1, Name ="Name_1"},

new { ID = 2, Name = "Name_2"},

new { ID = 3, Name = "Name_3"},

new { ID = 4, Name = "Name_4"},

new { ID = 5, Name = "Name_5"}

};

RadGrid1.DataSource = data;

}

protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)

{

if (e.Item is GridDataItem)

{

GridDataItem item = e.Item as GridDataItem;

ScriptManager.GetCurrent(Page).RegisterPostBackControl(item["ButtonName"].Controls[0]);

}

protected void RadGrid1_ItemCommand(object sender, Telerik.Web.UI.GridCommandEventArgs e)

{

if (e.CommandName == "Generate")

{

Response.ContentType = "text/plain";

Response.AppendHeader("Content-Disposition", "attachment;filename= errorLog.txt");

Response.AddHeader("content-length", "0");

Response.Flush();

Response.End();

}

Thanks,
Jayesh Goyani

answered on 11 Apr 2015, 04:38 AM

Hey hi Jayesh,

Here is my code below:

protected void attachmentHandler(object sender, GridCommandEventArgs e, string userType)

{

try {

const string Quote = "\"";

GridEditableItem dataItem = (GridEditableItem)e.Item;

string fileName = dataItem[userType + "Attachment"].Text;

string path = Server.MapPath("~/Attachments/" + fileName);

if (e.CommandName == "Download" + userType + "Attachment")

{

if (e.Item is GridEditableItem)

{

string name = Path.GetFileName(path);

string ext = Path.GetExtension(path);

string type = "";

if (ext != null)

{

switch (ext.ToLower())

{

case ".docx":

case ".doc":

case ".rtf":

type = "Application/msword";

break;

case ".xls":

case ".xlsx":

case ".csv":

type = "Application/x-msexcel";

break;

default:

type = "text/plain";

break;

}

Response.AppendHeader("content-disposition",

"attachment; filename=" + name.Remove(name.IndexOf("_!!_")) + ext);

if (type != "")

Response.ContentType = type;

Response.WriteFile(path);

Response.End();

}

catch (Exception ex)

{

String s = ex.Message;

}

answered on 16 Apr 2015, 05:05 AM

[quote]Maria Ilieva said:Hi,

If you want to invoke download for a file from an AJAX-enabled control (either placed in RadAjaxPanel or ajaxified by RadAjaxManager), you cannot use the normal response.WriteFile function, because the XmlHttpRequest cannot handle this.
Please strictly follow the appraoch provided by Jayesh and see if it works.

Regards,
Maria Ilieva
Telerik

See What's Next in App Development. Register for TelerikNEXT.

[/quote]

Hi Maria and Jayesh,

The problem is: When the users open the form template and attach their files, they cannot download it after the file is uploaded unless they reload the page. This behavior is encountered if they do any type of action (Update/Insert/Cancel) in Form template.

I am using AjaxManager with below code behind on ItemDataBound of grid but still no luck.

string[] uniqueNameArr = { "DownloadAtt", "DeleteAtt"};

foreach (string uniqueName in uniqueNameArr)

{                        ScriptManager.GetCurrent(Page).RegisterPostBackControl(dataItem[uniqueName].Controls[0]);             }