Function getPopperOffsets

app/src/static/js/react-bootstrap.js:3773–3797

* Get offsets to the popper * @method * @memberof Popper.Utils * @param {Object} position - CSS position the Popper will get applied * @param {HTMLElement} popper - the popper element * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this) * @param {Str

(popper, referenceOffsets, placement)

function getPopperOffsets(popper, referenceOffsets, placement) {
  placement = placement.split('-')[0]; // Get popper node sizes

  var popperRect = getOuterSizes(popper); // Add position, width and height to our offsets object

  var popperOffsets = {
    width: popperRect.width,
    height: popperRect.height
  }; // depending by the popper placement we have to compute its offsets slightly differently

  var isHoriz = ['right', 'left'].indexOf(placement) !== -1;
  var mainSide = isHoriz ? 'top' : 'left';
  var secondarySide = isHoriz ? 'left' : 'top';
  var measurement = isHoriz ? 'height' : 'width';
  var secondaryMeasurement = !isHoriz ? 'height' : 'width';
  popperOffsets[mainSide] = referenceOffsets[mainSide] + referenceOffsets[measurement] / 2 - popperRect[measurement] / 2;

  if (placement === secondarySide) {
    popperOffsets[secondarySide] = referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
  } else {
    popperOffsets[secondarySide] = referenceOffsets[getOppositePlacement(secondarySide)];
  }

  return popperOffsets;
}
/**
 * Mimics the `find` method of Array
 * @method