Ajax UpdatePanel - How to download a file if a download button is inside the UpdatePanel

Question

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I have a button in ajax updatepanel, when the button is clicked a file should be downloaded, but i was not able to download it.

earlier when the buuton is not in updatepanel, file download is working fine.

can any one help in this issue.

XML

<th   height="21" align="left" valign="middle"                    
        scope="col" colspan="5">
<asp:UpdatePanel ID="UpdatePanel9" runat="server"  UpdateMode="Conditional" >
<ContentTemplate>
<asp:Button ID="Download" runat="server" Text="Btn Download " Width="142px"
CssClass="button" onclick="Download_Click" Visible="true" Enabled="false"/>
</ContentTemplate>
<Triggers>
                                                            <asp:AsyncPostBackTrigger ControlID="AType" EventName="SelectedIndexChanged" />
                                                            <asp:AsyncPostBackTrigger ControlID="tvMatched" EventName="SelectedNodeChanged" />

                                                            <asp:AsyncPostBackTrigger ControlID="SearchBtn" EventName="Click" />
                                                          </Triggers>
                                                        </asp:UpdatePanel>
                                  </th>

Posted 4-May-11 18:11pm

KishoreT

Updated 4-May-11 20:17pm

Sunasara Imdadhusen

v2

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Comments

Sunasara Imdadhusen 5-May-11 2:18am

Added PRE tag properly!

4 solutions

Solution 2

Hi
Please use following code:

XML

<Triggers>
<asp:PostBackTrigger ControlID="Download_Click">
</Triggers>

Thanks,
Imdadhusen

Posted 4-May-11 20:21pm

Sunasara Imdadhusen

Updated 4-May-11 20:22pm

v2

Comments

camixx 10-Jun-14 10:54am

The ControlID you're setting is incorrect according to the code above. You need to do:

<Triggers>
<asp:PostBackTrigger ControlID="Download">
</Triggers>

Solution 1

On the click event of the "Download_Click", open another page with an IFrame, and write your download logic on that page. Than it will work perfectly.

Because due to UpdatePanel your page doesnot refresh so downlaod will not work

Posted 4-May-11 20:09pm

nit_singh

Comments

Sandeep Mewara 5-May-11 2:28am

Because due to UpdatePanel your page doesnot refresh so downlaod will not work
That's incorrect.

We have Async downloads now and a postback trigger would do.

Solution 5

solution 4 is awsome
please try it

Posted 29-May-14 2:31am

dippu11033

Comments

CHill60 29-May-14 8:41am

Not a solution. If you have a comment to make use the "Have a Question or Comment?" link. If you think a solution is good then click on the star rating to the top right of the appropriate post

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tum_kaw · Accepted Answer · 2014-03-11T23:34:00

No need IFrame you can Register script in you page and use window.open for open new webform with out ajax as contain you dowload file logic on page load event.

=====page from main script=======
output = @"C:\\Myfile.csv"
ScriptManager.RegisterStartupScript(Page, GetType(), "MyScript", "window.open(' FileDownloader.aspx?ifile=" + HttpUtility.UrlEncode(output) + "');", true);
=========New page web form for loadload file===========

C#

protected void Page_Load(object sender, EventArgs e)
        {

           string output = Page.Request.QueryString.Get("ifile");
           string iUrl = HttpUtility.UrlDecode(output);
            string Filesname = "Test Export.xlsx";
            FileInfo file = new FileInfo(iUrl);
            if (file.Exists)
            {
                Response.Clear();
                Response.ClearHeaders();
                Response.ClearContent();
                Response.AddHeader("content-disposition", "attachment; filename=" + Filesname);
                Response.AddHeader("Content-Type", "application/Excel");
                Response.ContentType = "application/vnd.xls";
                Response.AddHeader("Content-Length", file.Length.ToString());
                Response.WriteFile(file.FullName);
                Response.End();
            }
            else
            {
                Response.Write("This file does not exist.");

            }

Ajax UpdatePanel - How to download a file if a download button is inside the UpdatePanel

4 solutions

Solution 4

Solution 2

Solution 1

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