Function getChild

modular/sortable.complete.esm.js:349–363

* Gets nth child of el, ignoring hidden children, sortable's elements (does not ignore clone if it's visible) * and non-draggable elements * @param {HTMLElement} el The parent element * @param {Number} childNum The index of the child * @param {Object} options Parent Sortable'

(el, childNum, options, includeDragEl)

 * @return {HTMLElement}          The child at index childNum, or null if not found
 */
function getChild(el, childNum, options, includeDragEl) {
  var currentChild = 0,
    i = 0,
    children = el.children;
  while (i < children.length) {
    if (children[i].style.display !== 'none' && children[i] !== Sortable.ghost && (includeDragEl || children[i] !== Sortable.dragged) && closest(children[i], options.draggable, el, false)) {
      if (currentChild === childNum) {
        return children[i];
      }
      currentChild++;
    }
    i++;
  }
  return null;
}

/**
 * Gets the last child in the el, ignoring ghostEl or invisible elements (clones)