botframework-webchat-component/lib/Utils/firstTabbableDescendant.js

React component of botframework-webchat

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = firstTabbableDescendant;
exports.orSelf = orSelf;
var _getTabIndex = _interopRequireDefault(require("./TypeFocusSink/getTabIndex"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
var ALWAYS_TRUE_FN = function ALWAYS_TRUE_FN() {
  return true;
};
var SELECTOR = 'a[href], audio, button, details, details summary, embed, iframe, input, object, rect, select, svg[focusable], textarea, video, [tabindex]';
function firstTabbableDescendant(element) {
  var filter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ALWAYS_TRUE_FN;
  if (!element) {
    return;
  }

  // This is best-effort for finding a tabbable element.
  // For a comprehensive list, please refer to https://allyjs.io/data-tables/focusable.html and update this list accordingly.
  var focusables = [].filter.call(element.querySelectorAll(SELECTOR), filter);
  return [].find.call(focusables, function (focusable) {
    var tabIndex = (0, _getTabIndex.default)(focusable);
    return typeof tabIndex === 'number' && tabIndex >= 0;
  });
}
function orSelf(element) {
  if (!element) {
    return;
  }

  // "msMatchesSelector" is vendor-prefixed version of "matches".
  // eslint-disable-next-line dot-notation
  if ((element.matches || element['msMatchesSelector']).call(element, SELECTOR)) {
    return element;
  }
  return firstTabbableDescendant(element);
}
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