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Thanks for your question - however, per the forum rules can you link to a test case showing the issue please. This will allow the issue to be debugged. Information on how to create a test page, if you can't provide a link to your own page can be found here. Thanks, Allan

And if I am still using DataTools? This is working perfectly on my other sites with me just including the dataTable-tools in the class of the table.

This is a known issue at the moment and I'm afraid complex headers are not supported for the export functions at this time. Allan

is there any way wherein I can attach export event to any button placed some where else on the page? You can place the Buttons anywhere you want using the buttons().container() method and a little jQuery, but the export functions used by Buttons are not currently publicly exposed. Allan

Thank you very much, I missed that functionality

Use the "Buttons" extension. http://datatables.net/extensions/buttons/

Converted the image to Base64 and it worked a treat. Thanks.

The same question, with almost identical wording, has been answered here: https://www.datatables.net/forums/discussion/18225/tabletools-pdf-export-align-text-left-but-numbers-right

Unless you are using server-side processing (which you shouldn't need to do for only 1000 records). If you are using server-side processing only the rows visible will be exported since TableTools is a client-side script and that is all the rows that are available at the client-side. You could use the download plug-in for TableTools if you want to have the server generate the exported file that contains all of the rows. You would need to create the server-side script for that though. Allan

A minor technicality :-)