@salesforce/design-system-react/module/utilities/tabbable.js

Salesforce Lightning Design System for React

/*!
 * Adapted from jQuery UI core
 *
 * http://jqueryui.com
 *
 * Copyright 2014 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/category/ui-core/
 */
function focusable(element, isTabIndexNotNaN) {
  var nodeName = element.nodeName.toLowerCase();

  if (/input|select|textarea|button|object/.test(nodeName)) {
    return !element.disabled; // eslint-disable-next-line no-else-return
  } else if (nodeName === 'a') {
    return element.href || isTabIndexNotNaN;
  }

  return isTabIndexNotNaN;
}

function tabbable(element) {
  var tabIndex = element.getAttribute('tabindex');
  if (tabIndex === null) tabIndex = undefined;
  var isTabIndexNaN = isNaN(tabIndex);
  return (isTabIndexNaN || tabIndex >= 0) && focusable(element, !isTabIndexNaN);
}

function findTabbableDescendants(element) {
  return [].slice.call(element.querySelectorAll('*'), 0).filter(function (el) {
    return tabbable(el);
  });
}

export default findTabbableDescendants;
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