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How to begin download with a button in grid

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Silvio Silva Junior
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Silvio Silva Junior asked on 10 May 2010, 06:27 PM
Hello guys.

I have a grid with a ImageButton in a template column. In the click event of this button, I have this code:

FileInfo file= new FileInfo("D:\\projetos\\GED\\content\\upload\\00001\\20100510104408625_aurora_boreal_noruega.JPG"); 
 
        Response.Clear();        
 
        Response.ContentType = "application/octet-stream"
 
        Response.AddHeader("Content-Disposition""attachment; filename=" + file + ""); 
 
        Response.AddHeader("Content-Length", file.Length.ToString()); 
 
        Response.Flush(); 
 
        Response.WriteFile(file.FullName); 

But, when I click this button, I have an error:

"Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed"

My grid is inside an ajax panel, and I think it is the problem, because I put another button out of ajax panel, with the same code in click event, and it works fine.

What's the best option for this case?

Thanks in advance.

Regards.

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Daniel
Telerik team
answered on 11 May 2010, 09:15 PM
Hello Silvio,

You should cancel the AJAX request and perform a standard postback when downloading/exporting files. Sample code-snippet is shown below:
<script type="text/javascript">
   function onRequestStart(sender, args)
   {
       if (args.get_eventTarget().indexOf("DownloadButton") >= 0)
           args.set_enableAjax(false);
   }
</script>

<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" ClientEvents-OnRequestStart="onRequestStart">
   ....
   <asp:ImageButton ID="DownloadButton" runat="server" ....
   ....
</telerik:RadAjaxPanel>

Let me know if you need further assistance.

Best regards,
Daniel
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Silvio Silva Junior
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answered on 12 May 2010, 06:07 PM
Thank you Daniel.

I tryed your suggestion and it works fine, but I have another (2 actually) problem.

I have a master page, and so, when I try to use the name of component, the javascript function can't get the control. My code is like this:

<script type="text/javascript">     
   function onRequestStart(sender, args)     
   {     
       if (args.get_eventTarget().indexOf("ctl00_ContentPlaceHolder1_Button1") >= 0)     
           args.set_enableAjax(false);     
   }     
</script>    
 

But, it not works! The indexOf properties always is -1, so, how can I get the control?

The other problem is:

The code above was a test, but, in my real scenario I have a grid with a ImageButton in a template column, and, I searched for the imagebutton name (in source code page) and I didn't found it.

Can you make a simple project to show how it can work?

Thank you.

Best regards.
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Accepted
Daniel
Telerik team
answered on 12 May 2010, 09:40 PM
Hello Silvio,

I suggested that you use indexOf  in order to help you avoid using hardcoded client id's (such as ctl00_ContentPlaceHolder....).

Please try to modify your code this way:

<script type="text/javascript">    
   function onRequestStart(sender, args)    
   {    
       if (args.get_eventTarget().indexOf("Button1") >= 0)    
           args.set_enableAjax(false);    
   }    
</script>

As to the second question - just use the ID of the control - you don't have to supply the full client id here - that's why I use indexOf instead of the standard equal sign.

I will gladly provide a runnable demo for you if this suggestion doesn't help.

Regards,
Daniel
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Silvio Silva Junior
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answered on 31 May 2010, 02:04 PM
Hello Daniel.

Your answer works fine for me, thanks a lot.

Regards.
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