$('#show').on('change', function(e) {
  // retrieve the dropdown selected value
  var location = e.target.value;
  var table = $('.tablesorter');
  // if a location is selected
  if (location.length) {
    // hide all not matching
    table.find('tbody tr[data-type!=' + location + ']').hide();
    // display all matching
    table.find('tbody tr[data-type=' + location + ']').show();
  } else {
    // location is not selected,
    // display all
    table.find('tbody tr').show();
  }
});