chushihua

node_modules/element-ui/lib/utils/aria-utils.js

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+'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;
+};
+
+aria.Utils.isFocusable = function (element) {
+  if (element.tabIndex > 0 || element.tabIndex === 0 && element.getAttribute('tabIndex') !== null) {
+    return true;
+  }
+
+  if (element.disabled) {
+    return false;
+  }
+
+  switch (element.nodeName) {
+    case 'A':
+      return !!element.href && element.rel !== 'ignore';
+    case 'INPUT':
+      return element.type !== 'hidden' && element.type !== 'file';
+    case 'BUTTON':
+    case 'SELECT':
+    case 'TEXTAREA':
+      return true;
+    default:
+      return false;
+  }
+};
+
+/**
+ * 触发一个事件
+ * mouseenter, mouseleave, mouseover, keyup, change, click 等
+ * @param  {Element} elm
+ * @param  {String} name
+ * @param  {*} opts
+ */
+aria.Utils.triggerEvent = function (elm, name) {
+  var eventName = void 0;
+
+  if (/^mouse|click/.test(name)) {
+    eventName = 'MouseEvents';
+  } else if (/^key/.test(name)) {
+    eventName = 'KeyboardEvent';
+  } else {
+    eventName = 'HTMLEvents';
+  }
+  var evt = document.createEvent(eventName);
+
+  for (var _len = arguments.length, opts = Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {
+    opts[_key - 2] = arguments[_key];
+  }
+
+  evt.initEvent.apply(evt, [name].concat(opts));
+  elm.dispatchEvent ? elm.dispatchEvent(evt) : elm.fireEvent('on' + name, evt);
+
+  return elm;
+};
+
+aria.Utils.keys = {
+  tab: 9,
+  enter: 13,
+  space: 32,
+  left: 37,
+  up: 38,
+  right: 39,
+  down: 40
+};
+
+exports.default = aria.Utils;