target/classes/static/plugins/element-ui/lib/utils/aria-utils.js

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

'use strict';

exports.__esModule = true;
var aria = aria || {};

aria.Utils = aria.Utils || {};

/**
 * @desc Set focus on descendant nodes until the first focusable element is
 *       found.
 * @param element
 *          DOM node for which to find the first focusable descendant.
 * @returns
 *  true if a focusable element is found and focus is set.
 */
aria.Utils.focusFirstDescendant = function (element) {
  for (var i = 0; i < element.childNodes.length; i++) {
    var child = element.childNodes[i];
    if (aria.Utils.attemptFocus(child) || aria.Utils.focusFirstDescendant(child)) {
      return true;
    }
  }
  return false;
};

/**
 * @desc Find the last descendant node that is focusable.
 * @param element
 *          DOM node for which to find the last focusable descendant.
 * @returns
 *  true if a focusable element is found and focus is set.
 */

aria.Utils.focusLastDescendant = function (element) {
  for (var i = element.childNodes.length - 1; i >= 0; i--) {
    var child = element.childNodes[i];
    if (aria.Utils.attemptFocus(child) || aria.Utils.focusLastDescendant(child)) {
      return true;
    }
  }
  return false;
};

/**
 * @desc Set Attempt to set focus on the current node.
 * @param element
 *          The node to attempt to focus on.
 * @returns
 *  true if element is focused.
 */
aria.Utils.attemptFocus = function (element) {
  if (!aria.Utils.isFocusable(element)) {
    return false;
  }
  aria.Utils.IgnoreUtilFocusChanges = true;
  try {
    element.focus();
  } catch (e) {}
  aria.Utils.IgnoreUtilFocusChanges = false;
  return document.activeElement === element;