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/**
 * @copyright  (C) 2018 Open Source Matters, Inc.
<https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see
LICENSE.txt
 */

(document => {
  const isChecked = element => element.checked;
  const getTreeElements = element =>
element.querySelectorAll('input[type="checkbox"]');
  const getTreeRoot = element =>
element.parentElement.nextElementSibling;
  const check = element => {
    element.checked = true;
  };
  const uncheck = element => {
    element.checked = false;
  };
  const disable = element => element.setAttribute('disabled',
'disabled');
  const enable = element =>
element.removeAttribute('disabled');
  const toggleState = (element, rootChecked) => {
    if (rootChecked === true) {
      disable(element);
      check(element);
      return;
    }
    enable(element);
    uncheck(element);
  };
  const switchState = ({
    target
  }) => {
    const root = getTreeRoot(target);
    const selfChecked = isChecked(target);
    if (root) {
      getTreeElements(root).map(element => toggleState(element,
selfChecked));
    }
  };
  document.querySelectorAll('.treeselect
input[type="checkbox"]').forEach(checkbox =>
checkbox.addEventListener('click', switchState));
})(document);