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You can use .lp file to generate a CSV that will be sent to the user.
First you need to attach an event to a button that will open .lp in a new window:

Code:

$(function() {
  // additional class must be set to csv
  $('.csv').on('vclick', function() {
    window.open('/user/csv.lp');
  });
});

Use this as a starting point for csv.lp:

Code:

<?
-- set headers for csv file download
setdlheader('text/csv; charset=utf-8', 'report', 'csv')
-- generate csv here
csv = '...'
-- output to the user
print(csv)