Function index

modular/sortable.complete.esm.js:386–399

* Returns the index of an element within its parent for a selected set of * elements * @param {HTMLElement} el * @param {selector} selector * @return {number}

(el, selector)

 * @return {number}
 */
function index(el, selector) {
  var index = 0;
  if (!el || !el.parentNode) {
    return -1;
  }

  /* jshint boss:true */
  while (el = el.previousElementSibling) {
    if (el.nodeName.toUpperCase() !== 'TEMPLATE' && el !== Sortable.clone && (!selector || matches(el, selector))) {
      index++;
    }
  }
  return index;
}

/**
 * Returns the scroll offset of the given element, added with all the scroll offsets of parent elements.