I am working on a simple form to generate a report in Excel format. There are a few text boxes and date pickers and then a button. The event for the button runs a length SQL query and then creates an excel file with the results and presents the file using Response.OutputStream. The page in itself works fine but I'd like to add a RadAjaxLoadingPanel while the button event is working. I've tried at least a half dozen different methods and it seems all I can ever get is either the loading panel goes off but the file is never presented or nothing happens at all. Can someone point me to a demo or something that does this?
I've tried the AjaxLoadingPanel Demo and the AjaxLoadingPanel - Explicit Show/Hide
1 Answer, 1 is accepted
Hello Ryan,
This is expected with MS AJAX - sending a file during a partial postback breaks the response, and the loading panel does not capture full postbacks.
What I can suggest is that you follow an approach similar to the following sample: http://www.telerik.com/support/code-library/show-loading-panel-when-exporting-radgrid.
Regards,
Progress Telerik