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AJAX call never returns

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Grid

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

Andy asked on 19 Apr 2011, 08:44 PM

I have a couple of grids on tabs for each row of a grid in a nested view. The code-behind opens the first record to view the first item. At this point, I can click on the link to download my attachment, but it only works the first time. After that, it hangs and I can't figure out why.

If you can figure out what I need to correct, it would be a tremendous help!

I've created a mini-project that demonstrates the problem. I've substituted 2 XML files for data sources, but, for this demo, the attachment is hard-coded. (It's using a PDF.)

<%@ Page Language="C#" %>

<%@ 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">

<script runat="server">

protected void DownloadForShot_ImageButton_Click(object sender, System.Web.UI.ImageClickEventArgs e)

{

ImageButton btnDownload = (ImageButton)sender;

GridDataItem dataItem = (GridDataItem)btnDownload.NamingContainer;

RadGrid Attachments_RadGrid = (RadGrid)dataItem.NamingContainer.NamingContainer;

Label lblShotID =(Label)Attachments_RadGrid.NamingContainer.FindControl("ShotID_Label");

try

{

//NOTE THE HARD CODED VALUE HERE

System.IO.FileInfo file = new System.IO.FileInfo("C:\\inetpub\\wwwroot\\TestSite\\Images\\TestPDF.pdf");

if (file.Exists)

{

Response.ClearContent();

Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}", file.Name));

Response.AddHeader("Content-Length", file.Length.ToString());

Response.ContentType = "application/pdf"; // "image/jpeg"

Response.TransmitFile(file.FullName);

HttpContext.Current.ApplicationInstance.CompleteRequest();

}

else

{

throw new Exception("There is no attachment for this path or the path is not valid.");

}

catch (Exception ex)

{

Response.Write("<span style='color:red;'>" + ex.Message + "</span>");

}

protected void ShotDetail_RadGrid_PreRender(object sender, EventArgs e)

{

if (!Page.IsPostBack)

{

if (ShotDetail_RadGrid.MasterTableView.Items.Count > 0)

{

ShotDetail_RadGrid.MasterTableView.Items[0].Expanded = true;

ShotDetail_RadGrid.MasterTableView.Items[0].ChildItem.FindControl("InnerContainer").Visible = true;

}

</script>

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title>Title</title>

</head>

<body>

<form id="form1" runat="server">

<div>

<div id="div_Shots_ShotDetail" style="width:99%; height:1500px; position:absolute;">

<telerik:RadGrid ID="ShotDetail_RadGrid" runat="server" DataSourceID="XmlDataSource1"

AllowPaging="True" Skin="Hay" GridLines="None" ShowStatusBar="True" Width="921px"

onprerender="ShotDetail_RadGrid_PreRender" >

<HierarchySettings ExpandTooltip="Show related merch" CollapseTooltip="Collapse merch"></HierarchySettings>

<ExportSettings IgnorePaging="True">

<Pdf PageBottomMargin="0.5in" PageHeight="8.5in" PageLeftMargin="0.35in"

PageRightMargin="0.35in" PageTopMargin="0.5in" PageWidth="11in" />

</ExportSettings>

<ClientSettings AllowColumnsReorder="True" ReorderColumnsOnClient="True">

<Selecting AllowRowSelect="True"></Selecting>

<Scrolling AllowScroll="True" UseStaticHeaders="True" />

</ClientSettings>

<MasterTableView DataSourceID="XmlDataSource1" AutoGenerateColumns="False"

AllowCustomPaging="True">

<NestedViewTemplate>

<asp:Panel runat="server" ID="InnerContainer" CssClass="viewWrap" Visible="false">

<telerik:RadTabStrip runat="server" ID="TabStip1" MultiPageID="Multipage1" SelectedIndex="0" Width="884px">

<Tabs>

<telerik:RadTab runat="server" Text="Attachments" PageViewID="PageView2" Selected="True">

</telerik:RadTab>

</Tabs>

</telerik:RadTabStrip>

<telerik:RadMultiPage runat="server" ID="Multipage1" SelectedIndex="0" RenderSelectedPageOnly="false" >

<telerik:RadPageView runat="server" ID="PageView1">

<asp:Label ID="ShotID_Label" runat="server" Text='<%# Eval("ShotID") %>' Visible="false" />

<asp:Label ID="Error_Label" runat="server"></asp:Label>

<telerik:RadGrid ID="Attachments_RadGrid" runat="server" DataSourceID="XmlDataSource2" GridLines="None">

<MasterTableView AutoGenerateColumns="False" DataSourceID="XmlDataSource2">

<CommandItemSettings ExportToPdfText="Export to PDF" />

<RowIndicatorColumn FilterControlAltText="Filter RowIndicator column">

<HeaderStyle Width="20px" />

</RowIndicatorColumn>

<ExpandCollapseColumn FilterControlAltText="Filter ExpandColumn column">

<HeaderStyle Width="20px" />

</ExpandCollapseColumn>

<Columns>

<telerik:GridTemplateColumn UniqueName="ColumnDownload">

<ItemTemplate>

<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server">

<asp:ImageButton ID="DownloadForShot_ImageButton" runat="server" ImageUrl="~/Images/view.gif"

OnClick="DownloadForShot_ImageButton_Click" />

</telerik:RadAjaxPanel>

</ItemTemplate>

</telerik:GridTemplateColumn>

<telerik:GridBoundColumn DataField="AttachmentTitle" HeaderText="Attachments" UniqueName="ColumnAttachment">

</telerik:GridBoundColumn>

</Columns>

<EditFormSettings>

<EditColumn FilterControlAltText="Filter EditCommandColumn column">

</EditColumn>

</EditFormSettings>

</MasterTableView>

<FilterMenu EnableImageSprites="False">

</FilterMenu>

<HeaderContextMenu CssClass="GridContextMenu GridContextMenu_Default">

</HeaderContextMenu>

</telerik:RadGrid>

<asp:XmlDataSource ID="XmlDataSource2" runat="server" DataFile="~/XMLFile2.xml"></asp:XmlDataSource>

</telerik:RadPageView>

<telerik:RadPageView Runat="server" Width="100%" ID="PageView2">

</telerik:RadPageView>

</telerik:RadMultiPage>

</asp:Panel>

</NestedViewTemplate>

<CommandItemSettings ExportToPdfText="Export to Pdf"></CommandItemSettings>

<RowIndicatorColumn FilterControlAltText="Filter RowIndicator column"></RowIndicatorColumn>

<ExpandCollapseColumn Visible="True"></ExpandCollapseColumn>

<Columns>

<telerik:GridBoundColumn DataField="ShotID" HeaderText="ShotID" UniqueName="ShotID"

FilterControlAltText="Filter ShotID column" SortExpression="ShotID">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="JobNumber" HeaderText="JobNumber" UniqueName="JobNumber"

FilterControlAltText="Filter JobNumber column" SortExpression="JobNumber">

</telerik:GridBoundColumn>

</Columns>

<EditFormSettings>

<EditColumn FilterControlAltText="Filter EditCommandColumn column"></EditColumn>

</EditFormSettings>

<PagerStyle AlwaysVisible="True" />

</MasterTableView>

<PagerStyle AlwaysVisible="True" />

<FilterMenu EnableImageSprites="False"></FilterMenu>

<HeaderContextMenu EnableImageSprites="True" CssClass="GridContextMenu GridContextMenu_Default"></HeaderContextMenu>

</telerik:RadGrid>

<asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/XMLFile.xml"></asp:XmlDataSource>

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

</div>

</form>

</body>

</html>

XML File 1:

<?xml version="1.0" encoding="utf-8" ?>

<tables>

<tShots ShotID="15736" JobNumber="254960"/>

<tShots ShotID="15737" JobNumber="254960"/>

<tShots ShotID="15738" JobNumber="254960"/>

<tShots ShotID="15739" JobNumber="254960"/>

<tShots ShotID="15740" JobNumber="254960"/>

<tShots ShotID="15741" JobNumber="254960"/>

</tables>

XML File 2:

<?xml version="1.0" encoding="utf-8" ?>

<tables>

<tAttachments ShotID="14394" AttachmentExtension=".jpg" AttachmentPath="~/images/Image1/file1.jpg" AttachmentTitle="File Name 1"/>

<tAttachments ShotID="15737" AttachmentExtension=".jpg" AttachmentPath="~/images/Image1/file2.jpg" AttachmentTitle="File Name 2"/>

<tAttachments ShotID="15738" AttachmentExtension=".jpg" AttachmentPath="~/images/Image1/file3.jpg" AttachmentTitle="File Name 3"/>

<tAttachments ShotID="15739" AttachmentExtension=".jpg" AttachmentPath="~/images/Image1/file4.jpg" AttachmentTitle="File Name 4"/>

<tAttachments ShotID="15740" AttachmentExtension=".jpg" AttachmentPath="~/images/Image1/file5.jpg" AttachmentTitle="File Name 5"/>

</tables>

1 Answer, 1 is accepted

Accepted

answered on 22 Apr 2011, 01:40 PM

Hello Andy,

I have examined your code and noticed that you have wrapped the Download button in a RadAjaxPanel. Due to the limitations of the javascript XmlHttpRequest object used for AJAX, to download or upload files, AJAX needs to be temporarily disabled, so that the page performs a full postback.
You can see how it is done here.

I hope this helps.

Best wishes,
Mira
the Telerik team

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