next-csrf/example/node_modules/ally.js/esm/get/active-element.js

CSRF mitigation library for Next.js

/*
  create ally.get.activeElement()
    wrapping ally.get.activeElements()

  fix ally.get.activeElements()
    https://github.com/jquery/jquery-ui/blob/ffcfb85c9818954adda69e73cf9ba76ea07b554c/ui/safe-active-element.js
*/

import getDocument from '../util/get-document';

export default function () {
  var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
      context = _ref.context;

  var _document = getDocument(context);
  var activeElement = void 0;

  try {
    // IE9 throws an "Unspecified error" accessing document.activeElement from an <iframe>
    // see https://github.com/jquery/jquery-ui/blob/ffcfb85c9818954adda69e73cf9ba76ea07b554c/ui/safe-active-element.js#L15-L21
    activeElement = _document.activeElement;
  } catch (e) {}
  // ignore


  // IE11 may return null instead of an element
  // see https://github.com/jquery/jquery-ui/blob/ffcfb85c9818954adda69e73cf9ba76ea07b554c/ui/safe-active-element.js#L23-L28
  // https://github.com/jquery/jquery-ui/blob/ffcfb85c9818954adda69e73cf9ba76ea07b554c/ui/safe-active-element.js#L30-L35
  if (!activeElement || !activeElement.nodeType) {
    activeElement = _document.body || _document.documentElement;
  }

  return activeElement;
}
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