Automatic placement for bootstrap popover

function.js

// Source https://github.com/twbs/bootstrap/issues/1833#issuecomment-4102195

placement: function (tip, element) {
  var offset = $(element).offset();
  height = $(document).outerHeight();
  width = $(document).outerWidth();
  vert = 0.5 * height - offset.top;
  vertPlacement = vert > 0 ? 'bottom' : 'top';
  horiz = 0.5 * width - offset.left;
  horizPlacement = horiz > 0 ? 'right' : 'left';
  placement = Math.abs(horiz) > Math.abs(vert) ?  horizPlacement : vertPlacement;
  
  return placement;
}