eclipse-scout-core/src/jquery/jquery-scout-selectors.js

/*
 * Copyright (c) 2014-2018 BSI Business Systems Integration AG.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     BSI Business Systems Integration AG - initial API and implementation
 */

import * as $ from 'jquery';

/**
 * This file extends jQuery with custom selectors required in Scout.
 * Part of this file is copied with some modifications from jQuery UI.
 */
export default class JQuerySelectors/* extends $*/ {
  static focusable(element, isTabIndexNotNaN) {
    var nodeName = element.nodeName.toLowerCase();
    return (/input|select|textarea|button|object/.test(nodeName) ?
      !element.disabled :
      'a' === nodeName ?
        element.href || isTabIndexNotNaN :
        isTabIndexNotNaN) &&
      // the element and all of its ancestors must be visible
      JQuerySelectors.visible(element);
  }

  static visible(element) {
    return $.expr.filters.visible(element) &&
      !$(element).parents().addBack().filter(function() {
        return $.css(this, 'visibility') === 'hidden';
      }).length;
  }
}

$.extend($.expr[':'], {

  focusable: function(element) {
    return JQuerySelectors.focusable(element, !isNaN($.attr(element, 'tabindex')));
  },

  tabbable: function(element) {
    var tabIndex = $.attr(element, 'tabindex'),
      isTabIndexNaN = isNaN(tabIndex);
    return (isTabIndexNaN || tabIndex >= 0) && JQuerySelectors.focusable(element, !isTabIndexNaN);
  }
});