/**
* <p>The MenuNav Node Plugin makes it easy to transform existing list-based markup into traditional,
* drop down navigational menus that are both accessible and easy to customize, and only require
* a small set of dependencies.</p>
* <p>To use the MenuNav Node Plugin, simply pass a reference to the plugin to a Node instance's
* <code>plug</code> method.</p>
*
* <p>
* <code>
* <script type="text/javascript"><br>
* <br>
* // Call the "use" method, passing in "node-menunav". This will load the <br>
* // script and CSS for the MenuNav Node Plugin and all of the required <br>
* // dependencies.<br>
* <br>
* YUI().use("node-menunav", function(Y) {<br>
* <br>
* // Use the "contentready" event to initialize the menu when the subtree of <br>
* // element representing the root menu (<div id="menu-1">) is ready to <br>
* // be scripted.<br>
* <br>
* Y.on("contentready", function () {<br>
* <br>
* // The scope of the callback will be a Node instance representing <br>
* // the root menu (<div id="menu-1">). Therefore, since "this"<br>
* // represents a Node instance, it is possible to just call "this.plug"<br>
* // passing in a reference to the MenuNav Node Plugin.<br>
* <br>
* this.plug(Y.plugin.NodeMenuNav);<br>
* <br>
* }, "#menu-1");<br>
* <br>
* }); <br>
* <br>
* </script><br>
* </code>
* </p>
*
* <p>The MenuNav Node Plugin has several configuration properties that can be set via an
* object literal that is passed as a second argument to a Node instance's <code>plug</code> method.
* </p>
*
* <p>
* <code>
* <script type="text/javascript"><br>
* <br>
* // Call the "use" method, passing in "node-menunav". This will load the <br>
* // script and CSS for the MenuNav Node Plugin and all of the required <br>
* // dependencies.<br>
* <br>
* YUI().use("node-menunav", function(Y) {<br>
* <br>
* // Use the "contentready" event to initialize the menu when the subtree of <br>
* // element representing the root menu (<div id="menu-1">) is ready to <br>
* // be scripted.<br>
* <br>
* Y.on("contentready", function () {<br>
* <br>
* // The scope of the callback will be a Node instance representing <br>
* // the root menu (<div id="menu-1">). Therefore, since "this"<br>
* // represents a Node instance, it is possible to just call "this.plug"<br>
* // passing in a reference to the MenuNav Node Plugin.<br>
* <br>
* this.plug(Y.plugin.NodeMenuNav, { mouseOutHideDelay: 1000 });<br>
* <br>
* }, "#menu-1");<br>
* <br>
* }); <br>
* <br>
* </script><br>
* </code>
* </p>
*
* <p> The complete list of the MenuNav Node Plugin configuration properties are:</p>
* <dl>
* <dt>useARIA</dt>
* <dd>Boolean indicating if use of the WAI-ARIA Roles and States should be enabled for the
* MenuNav. Set to true by default for Firefox 3 and Internet Explorer 8 as currently only
* these browsers have support for ARIA, and are supported by several screen readers for
* Windows that also offer support for ARIA.</dd>
*
* <dt>autoSubmenuDisplay</dt>
* <dd>Boolean indicating if submenus are automatically made visible when the user mouses over
* the menu's items. Set to true by default.</dd>
*
* <dt>submenuShowDelay</dt>
* <dd>Number indicating the time (in milliseconds) that should expire before a submenu is
* made visible when the user mouses over the menu's label. Set to 250 by default.</dd>
*
* <dt>submenuHideDelay</dt>
* <dd>Number indicating the time (in milliseconds) that should expire before a submenu is
* hidden when the user mouses out of a menu label heading in the direction of a submenu.
* Set to 250 by default.</dd>
*
* <dt>mouseOutHideDelay</dt>
* <dd>Number indicating the time (in milliseconds) that should expire before a submenu is
* hidden when the user mouses out of it. Set to 750 by default.</dd>
* </dl>
*
* @module node-menunav
*/
// Util shortcuts
var UA = Y.UA,
Lang = Y.Lang,
later = Y.later,
getClassName = Y.ClassNameManager.getClassName,
// Native types
TRUE = true,
FALSE = false,
NULL = null,
// Frequently used strings
MENU = "menu",
MENUITEM = "menuitem",
HIDDEN = "hidden",
TAB_INDEX = "tabIndex",
PARENT_NODE = "parentNode",
CHILDREN = "children",
OFFSET_HEIGHT = "offsetHeight",
OFFSET_WIDTH = "offsetWidth",
PX = "px",
ID = "id",
PERIOD = ".",
HANDLED_MOUSEOUT = "handledMouseOut",
HANDLED_MOUSEOVER = "handledMouseOver",
ACTIVE = "active",
LABEL = "label",
LOWERCASE_A = "a",
MOUSEDOWN = "mousedown",
KEYDOWN = "keydown",
CLICK = "click",
EMPTY_STRING = "",
FIRST_OF_TYPE = "first-of-type",
// CSS class names
CSS_MENU = getClassName(MENU),
CSS_MENU_HIDDEN = getClassName(MENU, HIDDEN),
CSS_MENU_HORIZONTAL = getClassName(MENU, "horizontal"),
CSS_MENU_LABEL = getClassName(MENU, LABEL),
CSS_MENU_LABEL_ACTIVE = getClassName(MENU, LABEL, ACTIVE),
CSS_MENU_LABEL_MENUVISIBLE = getClassName(MENU, LABEL, (MENU + "visible")),
CSS_MENUITEM = getClassName(MENUITEM),
CSS_MENUITEM_ACTIVE = getClassName(MENUITEM, ACTIVE),
// CSS selectors
MENU_SELECTOR = PERIOD + CSS_MENU;
// Utility functions
// TO DO: Remove once Node implements circular functionality
var getPreviousSibling = function (node) {
var oPrevious = node.previous(),
oParentNode,
oChildren,
oULs,
oUL;
if (!oPrevious) {
oParentNode = node.get(PARENT_NODE);
oULs = oParentNode.get(PARENT_NODE).get(CHILDREN);
if (oULs.size() > 1) {
oUL = oParentNode.previous();
if (oUL) {
oChildren = oUL.get(CHILDREN);
}
else {
oChildren = oULs.item(oULs.size() - 1).get(CHILDREN);
}
}
else {
oChildren = oParentNode.get(CHILDREN);
}
oPrevious = oChildren.item(oChildren.size() - 1);
}
return oPrevious;
};
// TO DO: Remove once Node implements circular functionality
var getNextSibling = function (node) {
var oNext = node.next(),
oParentNode,
oChildren,
oULs,
oUL;
if (!oNext) {
oParentNode = node.get(PARENT_NODE);
oULs = oParentNode.get(PARENT_NODE).get(CHILDREN);
if (oULs.size() > 1) {
oUL = oParentNode.next();
if (oUL) {
oChildren = oUL.get(CHILDREN);
}
else {
oChildren = oULs.item(0).get(CHILDREN);
}
}
else {
oChildren = node.get(PARENT_NODE).get(CHILDREN);
}
oNext = oChildren.item(0);
}
return oNext;
};
var setARIARole = function (node, role) {
node.setAttribute("role", role);
};
var setARIAProperty = function (node, property, value) {
node.setAttribute(("aria-" + property), value);
};
var setARIAPresentation = function (node) {
setARIARole(node, "presentation");
};
var removeFromTabIndex = function (node) {
node.set(TAB_INDEX, -1);
};
var placeInDefaultTabIndex = function (node) {
node.set(TAB_INDEX, 0);
};
var isAnchor = function (node) {
var bReturnVal = FALSE;
if (node) {
bReturnVal = node.get("nodeName").toLowerCase() === LOWERCASE_A;
}
return bReturnVal;
};
var isMenuItem = function (node) {
return node.hasClass(CSS_MENUITEM);
};
var isMenuLabel = function (node) {
return node.hasClass(CSS_MENU_LABEL);
};
var isHorizontalMenu = function (menu) {
return menu.hasClass(CSS_MENU_HORIZONTAL);
};
var hasVisibleSubmenu = function (menuLabel) {
return menuLabel.hasClass(CSS_MENU_LABEL_MENUVISIBLE);
};
var getItemAnchor = function (node) {
return isAnchor(node) ? node : node.query(LOWERCASE_A);
};
var getNodeWithClass = function (node, className, searchAncestors) {
var oItem;
if (node) {
if (node.hasClass(className)) {
oItem = node;
}
if (!oItem && searchAncestors) {
oItem = node.ancestor((PERIOD + className));
}
}
return oItem;
};
var getParentMenu = function (node) {
return node.ancestor(MENU_SELECTOR);
};
var getMenu = function (node, searchAncestors) {
return getNodeWithClass(node, CSS_MENU, searchAncestors);
};
var getMenuItem = function (node, searchAncestors) {
var oItem;
if (node) {
oItem = getNodeWithClass(node, CSS_MENUITEM, searchAncestors);
}
return oItem;
};
var getMenuLabel = function (node, searchAncestors) {
var oItem;
if (node) {
if (searchAncestors) {
oItem = getNodeWithClass(node, CSS_MENU_LABEL, searchAncestors);
}
else {
oItem = getNodeWithClass(node, CSS_MENU_LABEL) || node.query((PERIOD + CSS_MENU_LABEL));
}
}
return oItem;
};
var getItem = function (node, searchAncestors) {
var oItem;
if (node) {
oItem = getMenuItem(node, searchAncestors) || getMenuLabel(node, searchAncestors);
}
return oItem;
};
var getNextItem = function (item, previous) {
var oItemLI,
oNextLI,
oNextItem;
if (item) {
oItemLI = isMenuItem(item) ? item : item.get(PARENT_NODE);
oNextLI = previous ? getPreviousSibling(oItemLI) : getNextSibling(oItemLI);
oNextItem = getItem(oNextLI);
}
return oNextItem;
};
var getPreviousItem = function (item) {
return getNextItem(item, true);
};
var getFirstItem = function (menu) {
return getItem(menu.query("li"));
};
var getActiveClass = function (node) {
return isMenuItem(node) ? CSS_MENUITEM_ACTIVE : CSS_MENU_LABEL_ACTIVE;
};
var blurItem = function (item) {
var oAnchor;
if (item) {
oAnchor = getItemAnchor(item);
// TO DO: Remove once implemented in Node
try {
oAnchor.blur();
}
catch (ex) { }
}
};
var focusItem = function (item) {
var oAnchor;
if (item) {
oAnchor = getItemAnchor(item);
// TO DO: Remove once implemented in Node
try {
oAnchor.focus();
}
catch (ex) { }
}
};
var handleMouseOverForNode = function (node, target) {
return node && !node[HANDLED_MOUSEOVER] && (node === target || node.contains(target));
};
var handleMouseOutForNode = function (node, relatedTarget) {
return node && !node[HANDLED_MOUSEOUT] &&
(node !== relatedTarget && !node.contains(relatedTarget));
};
/**
* The NodeMenuNav class is a plugin for a Node instance. The class is used via the
* <a href="Node.html#method_plug"><code>plug</code></a> method of Node and should not be
* instantiated directly.
* @namespace plugin
* @class NodeMenuNav
*/
var MenuNav = function (config) {
var menuNav = this,
oRootMenu = config.owner,
oDocument,
bUseARIA,
bAutoSubmenuDisplay,
nMouseOutHideDelay,
oMenuNodes,
oFirstItem,
oULs;
if (oRootMenu) {
bUseARIA = config.useARIA;
bAutoSubmenuDisplay = config.autoSubmenuDisplay;
nMouseOutHideDelay = config.mouseOutHideDelay;
// Enable ARIA for Firefox 3 and IE 8 by default since those are the two browsers
// that current support ARIA
menuNav._useARIA = Lang.isBoolean(bUseARIA) ?
bUseARIA : ((UA.gecko && UA.gecko >= 1.9) || (UA.ie && UA.ie >= 8));
menuNav._autoSubmenuDisplay =
Lang.isBoolean(bAutoSubmenuDisplay) ? bAutoSubmenuDisplay : TRUE;
menuNav._submenuShowDelay = config.submenuShowDelay || 250;
menuNav._submenuHideDelay = config.submenuHideDelay || 250;
menuNav._mouseOutHideDelay = Lang.isNumber(nMouseOutHideDelay) ? nMouseOutHideDelay : 750;
// Hide all visible submenus
oMenuNodes = oRootMenu.queryAll(MENU_SELECTOR);
if (oMenuNodes) {
oMenuNodes.addClass(CSS_MENU_HIDDEN);
}
oULs = oRootMenu.queryAll("ul:" + FIRST_OF_TYPE);
if (oULs) {
oULs.addClass(FIRST_OF_TYPE);
}
// Wire up all event handlers
oRootMenu.on("mouseover", menuNav._onMouseOver, menuNav);
oRootMenu.on("mouseout", menuNav._onMouseOut, menuNav);
oRootMenu.on("mousemove", menuNav._onMouseMove, menuNav);
oRootMenu.on(MOUSEDOWN, menuNav._toggleSubmenuDisplay, menuNav);
oRootMenu.on(KEYDOWN, menuNav._toggleSubmenuDisplay, menuNav);
oRootMenu.on(CLICK, menuNav._toggleSubmenuDisplay, menuNav);
oRootMenu.on("keypress", menuNav._onKeyPress, menuNav);
oRootMenu.on(KEYDOWN, menuNav._onKeyDown, menuNav);
oDocument = oRootMenu.get("ownerDocument");
oDocument.on(MOUSEDOWN, menuNav._onDocMouseDown, menuNav);
Y.on("focus", Y.bind(menuNav._onDocFocus, menuNav), oDocument);
menuNav._rootMenu = oRootMenu;
if (menuNav._useARIA) {
menuNav._applyARIA(oRootMenu);
oFirstItem = getFirstItem(oRootMenu);
if (oFirstItem) {
placeInDefaultTabIndex(getItemAnchor(oFirstItem));
menuNav._firstItem = oFirstItem;
}
}
}
};
MenuNav.NS = "MenuNav";
/**
* @property NodeMenuNav.SHIM_TEMPLATE_TITLE
* @description String representing the value for the <code>title</code> attribute for the shim used
* to prevent <code><select></code> elements from poking through menus in IE 6.
* @default "Menu Stacking Shim"
* @type String
*/
MenuNav.SHIM_TEMPLATE_TITLE = "Menu Stacking Shim";
/**
* @property NodeMenuNav.SHIM_TEMPLATE
* @description String representing the HTML used to create the <code><iframe></code> shim
* used to prevent <code><select></code> elements from poking through menus in IE 6.
* @default "<iframe frameborder="0" tabindex="-1"
* class="yui-shim" title="Menu Stacking Shim"
* src="javascript:false;"></iframe>"
* @type String
*/
// <iframe> shim notes:
//
// 1) Need to set the "frameBorder" property to 0 to suppress the default <iframe> border in IE.
// (Setting the CSS "border" property alone doesn't suppress it.)
//
// 2) The "src" attribute of the <iframe> is set to "javascript:false;" so that it won't load a
// page inside it, preventing the secure/nonsecure warning in IE when using HTTPS.
//
// 3) Since the role of the <iframe> shim is completely presentational, its "tabindex" attribute
// is set to "-1" and its title attribute is set to "Menu Stacking Shim". Both strategies help
// users of screen readers to avoid mistakenly interacting with the <iframe> shim.
MenuNav.SHIM_TEMPLATE = '<iframe frameborder="0" tabindex="-1" class="' +
getClassName("shim") +
'" title="' + MenuNav.SHIM_TEMPLATE_TITLE +
'" src="javascript:false;"></iframe>';
MenuNav.prototype = {
// Protected properties
/**
* @property _rootMenu
* @description Node instance representing the root menu in the MenuNav.
* @default null
* @protected
* @type Node
*/
_rootMenu: NULL,
/**
* @property _activeItem
* @description Node instance representing the MenuNav's active descendent - the menuitem or
* menu label the user is currently interacting with.
* @default null
* @protected
* @type Node
*/
_activeItem: NULL,
/**
* @property _activeMenu
* @description Node instance representing the menu that is the parent of the MenuNav's
* active descendent.
* @default null
* @protected
* @type Node
*/
_activeMenu: NULL,
/**
* @property _hasFocus
* @description Boolean indicating if the MenuNav has focus.
* @default false
* @protected
* @type Boolean
*/
_hasFocus: FALSE,
// In gecko-based browsers a mouseover and mouseout event will fire even
// if a DOM element moves out from under the mouse without the user actually
// moving the mouse. This bug affects MenuNav because the user can hit the
// Esc key to hide a menu, and if the mouse is over the menu when the
// user presses Esc, the _onMenuMouseOut handler will be called. To fix this
// bug the following flag (_blockMouseEvent) is used to block the code in the
// _onMenuMouseOut handler from executing.
/**
* @property _blockMouseEvent
* @description Boolean indicating whether or not to handle the "mouseover" event.
* @default false
* @protected
* @type Boolean
*/
_blockMouseEvent: FALSE,
/**
* @property _currentMouseX
* @description Number representing the current x coordinate of the mouse inside the MenuNav.
* @default 0
* @protected
* @type Number
*/
_currentMouseX: 0,
/**
* @property _movingToSubmenu
* @description Boolean indicating if the mouse is moving from a menu label to its
* corresponding submenu.
* @default false
* @protected
* @type Boolean
*/
_movingToSubmenu: FALSE,
/**
* @property _showSubmenuTimer
* @description Timer used to show a submenu.
* @default null
* @protected
* @type Object
*/
_showSubmenuTimer: NULL,
/**
* @property _hideSubmenuTimer
* @description Timer used to hide a submenu.
* @default null
* @protected
* @type Object
*/
_hideSubmenuTimer: NULL,
/**
* @property _hideAllSubmenusTimer
* @description Timer used to hide a all submenus.
* @default null
* @protected
* @type Object
*/
_hideAllSubmenusTimer: NULL,
/**
* @property _firstItem
* @description Node instance representing the first item (menuitem or menu label) in the root
* menu of a MenuNav.
* @default null
* @protected
* @type Node
*/
_firstItem: NULL,
/**
* @property _autoSubmenuDisplay
* @description Boolean indicating if submenus are automatically made visible when the user
* mouses over the menu's items.
* @default true
* @protected
* @type Boolean
*/
_autoSubmenuDisplay: TRUE,
// Protected methods
/**
* @method _isRoot
* @description Returns a boolean indicating if the specified menu is the root menu in
* the MenuNav.
* @protected
* @param {Node} menu Node instance representing a menu.
* @return {Boolean} Boolean indicating if the specified menu is the root menu in the MenuNav.
*/
_isRoot: function (menu) {
return this._rootMenu.compareTo(menu);
},
/**
* @method _getTopmostSubmenu
* @description Returns the topmost submenu of a submenu hierarchy.
* @protected
* @param {Node} menu Node instance representing a menu.
* @return {Node} Node instance representing a menu.
*/
_getTopmostSubmenu: function (menu) {
var menuNav = this,
oMenu = getParentMenu(menu),
returnVal;
if (!oMenu) {
returnVal = menu;
}
else if (menuNav._isRoot(oMenu)) {
returnVal = menu;
}
else {
returnVal = menuNav._getTopmostSubmenu(oMenu);
}
return returnVal;
},
/**
* @method _clearActiveItem
* @description Clears the MenuNav's active descendent.
* @protected
*/
_clearActiveItem: function () {
var menuNav = this,
oActiveItem = menuNav._activeItem;
if (oActiveItem) {
oActiveItem.removeClass(getActiveClass(oActiveItem));
if (menuNav._useARIA) {
removeFromTabIndex(getItemAnchor(oActiveItem));
}
}
menuNav._activeItem = NULL;
},
/**
* @method _setActiveItem
* @description Sets the specified menuitem or menu label as the MenuNav's active descendent.
* @protected
* @param {Node} item Node instance representing a menuitem or menu label.
*/
_setActiveItem: function (item) {
var menuNav = this;
if (item) {
menuNav._clearActiveItem();
item.addClass(getActiveClass(item));
if (menuNav._useARIA) {
placeInDefaultTabIndex(getItemAnchor(item));
}
menuNav._activeItem = item;
}
},
/**
* @method _focusItem
* @description Focuses the specified menuitem or menu label.
* @protected
* @param {Node} item Node instance representing a menuitem or menu label.
*/
_focusItem: function (item) {
if (item && this._hasFocus) {
// Need to focus using a zero-second timeout to get Apple's VoiceOver to
// recognize that the focused item has changed
later(0, null, focusItem, item);
}
},
/**
* @method _applyARIA
* @description Applies the ARIA Roles, States and Properties to the supplied menu.
* @protected
* @param {Node} menu Node instance representing a menu.
*/
_applyARIA: function (menu) {
var menuNav = this,
bIsRoot = menuNav._isRoot(menu),
oMenuLabel,
oMenuToggle,
oListNodes,
oMenuItemContentNodes,
oMenuLabelNodes,
oSubmenu,
sID;
setARIARole(menu, (bIsRoot ? "menubar" : MENU));
if (!bIsRoot) {
oMenuLabel = menu.previous();
oMenuToggle = oMenuLabel.query(PERIOD + getClassName(MENU, "toggle"));
if (oMenuToggle) {
oMenuLabel = oMenuToggle;
}
sID = oMenuLabel.get(ID);
if (!sID) {
sID = Y.guid();
oMenuLabel.set(ID, sID);
}
setARIAProperty(menu, "labelledby", sID);
setARIAProperty(menu, HIDDEN, TRUE);
}
oListNodes = menu.queryAll("ul,li");
if (oListNodes) {
oListNodes.each(function (node) {
setARIAPresentation(node);
});
}
oMenuItemContentNodes = menu.queryAll((PERIOD + getClassName(MENUITEM, "content")));
if (oMenuItemContentNodes) {
oMenuItemContentNodes.each(function (node) {
removeFromTabIndex(node);
setARIARole(node, MENUITEM);
});
}
oMenuLabelNodes = menu.queryAll((PERIOD + CSS_MENU_LABEL));
if (oMenuLabelNodes) {
oMenuLabelNodes.each(function (node) {
oMenuLabel = node;
oMenuToggle = node.query((PERIOD + getClassName(MENU, "toggle")));
if (oMenuToggle) {
setARIAPresentation(oMenuToggle);
removeFromTabIndex(oMenuToggle);
oMenuLabel = oMenuToggle.previous();
}
setARIARole(oMenuLabel, MENUITEM);
setARIAProperty(oMenuLabel, "haspopup", TRUE);
removeFromTabIndex(oMenuLabel);
oSubmenu = node.next();
if (oSubmenu) {
menuNav._applyARIA(oSubmenu);
}
});
}
},
/**
* @method _showMenu
* @description Shows the specified menu.
* @protected
* @param {Node} menu Node instance representing a menu.
*/
_showMenu: function (menu) {
var menuNav = this,
oParentMenu = getParentMenu(menu),
oLI = menu.get(PARENT_NODE),
aXY = oLI.getXY(),
oItem;
if (menuNav._useARIA) {
setARIAProperty(menu, HIDDEN, FALSE);
}
if (isHorizontalMenu(oParentMenu)) {
aXY[1] = aXY[1] + oLI.get(OFFSET_HEIGHT);
}
else {
aXY[0] = aXY[0] + oLI.get(OFFSET_WIDTH);
}
menu.setXY(aXY);
if (UA.ie < 8) {
if (UA.ie === 6 && !menu.hasIFrameShim) {
menu.appendChild(Y.Node.create(MenuNav.SHIM_TEMPLATE));
menu.hasIFrameShim = TRUE;
}
// Clear previous values for height and width
menu.setStyles({ height: EMPTY_STRING, width: EMPTY_STRING });
// Set the width and height of the menu's bounding box - this is necessary for IE 6
// so that the CSS for the <iframe> shim can simply set the <iframe>'s width and height
// to 100% to ensure that dimensions of an <iframe> shim are always sync'd to the
// that of its parent menu. Specifying a width and height also helps when positioning
// decorator elements (for creating effects like rounded corners) inside a menu's
// bounding box in IE 7.
menu.setStyles({
height: (menu.get(OFFSET_HEIGHT) + PX),
width: (menu.get(OFFSET_WIDTH) + PX) });
}
menu.previous().addClass(CSS_MENU_LABEL_MENUVISIBLE);
menu.removeClass(CSS_MENU_HIDDEN);
oItem = getFirstItem(menu);
menuNav._focusItem(oItem);
},
/**
* @method _hideMenu
* @description Hides the specified menu.
* @protected
* @param {Node} menu Node instance representing a menu.
* @param {Boolean} activateAndFocusLabel Boolean indicating if the label for the specified
* menu should be focused and set as active.
*/
_hideMenu: function (menu, activateAndFocusLabel) {
var menuNav = this,
oLabel = menu.previous(),
oActiveItem;
oLabel.removeClass(CSS_MENU_LABEL_MENUVISIBLE);
if (activateAndFocusLabel) {
menuNav._setActiveItem(oLabel);
menuNav._focusItem(oLabel);
}
oActiveItem = menu.query((PERIOD + CSS_MENUITEM_ACTIVE));
if (oActiveItem) {
oActiveItem.removeClass(CSS_MENUITEM_ACTIVE);
}
// Clear the values for top and left that were set by the call to "setXY" when the menu
// was shown so that the hidden position specified in the core CSS file will take affect.
menu.setStyles({ left: EMPTY_STRING, top: EMPTY_STRING });
menu.addClass(CSS_MENU_HIDDEN);
setARIAProperty(menu, HIDDEN, TRUE);
},
/**
* @method _hideAllSubmenus
* @description Hides all submenus of the specified menu.
* @protected
* @param {Node} menu Node instance representing a menu.
*/
_hideAllSubmenus: function (menu) {
var menuNav = this,
oSubmenus = menu.queryAll(MENU_SELECTOR);
if (oSubmenus) {
oSubmenus.each(Y.bind(function (submenuNode) {
menuNav._hideMenu(submenuNode);
}, menuNav));
}
},
/**
* @method _cancelShowSubmenuTimer
* @description Cancels the timer used to show a submenu.
* @protected
*/
_cancelShowSubmenuTimer: function () {
var menuNav = this,
oShowSubmenuTimer = menuNav._showSubmenuTimer;
if (oShowSubmenuTimer) {
oShowSubmenuTimer.cancel();
menuNav._showSubmenuTimer = NULL;
}
},
/**
* @method _cancelHideSubmenuTimer
* @description Cancels the timer used to hide a submenu.
* @protected
*/
_cancelHideSubmenuTimer: function () {
var menuNav = this,
oHideSubmenuTimer = menuNav._hideSubmenuTimer;
if (oHideSubmenuTimer) {
oHideSubmenuTimer.cancel();
menuNav._hideSubmenuTimer = NULL;
}
},
// Event handlers for discrete pieces of pieces of the menu
/**
* @method _onMenuMouseOver
* @description "mouseover" event handler for a menu.
* @protected
* @param {Node} menu Node instance representing a menu.
* @param {Object} event Object representing the DOM event.
*/
_onMenuMouseOver: function (menu, event) {
var menuNav = this,
oHideAllSubmenusTimer = menuNav._hideAllSubmenusTimer;
if (oHideAllSubmenusTimer) {
oHideAllSubmenusTimer.cancel();
menuNav._hideAllSubmenusTimer = NULL;
}
menuNav._cancelHideSubmenuTimer();
menuNav._activeMenu = menu;
if (menuNav._movingToSubmenu && isHorizontalMenu(menu)) {
menuNav._movingToSubmenu = FALSE;
}
},
/**
* @method _onMenuMouseOut
* @description "mouseout" event handler for a menu.
* @protected
* @param {Node} menu Node instance representing a menu.
* @param {Object} event Object representing the DOM event.
*/
_onMenuMouseOut: function (menu, event) {
var menuNav = this,
oActiveMenu = menuNav._activeMenu,
oRelatedTarget = event.relatedTarget,
oActiveItem = menuNav._activeItem,
oParentMenu,
oMenu;
if (oActiveMenu && !oActiveMenu.contains(oRelatedTarget)) {
oParentMenu = getParentMenu(oActiveMenu);
if (oParentMenu && !oParentMenu.contains(oRelatedTarget)) {
if (menuNav._mouseOutHideDelay > 0) {
menuNav._cancelShowSubmenuTimer();
menuNav._hideAllSubmenusTimer =
later(menuNav._mouseOutHideDelay, menuNav, function () {
var oSubmenu;
oActiveMenu = menuNav._activeMenu;
menuNav._hideAllSubmenus(menuNav._rootMenu);
if (oActiveMenu) {
// Focus the label element for the topmost submenu
oSubmenu = menuNav._getTopmostSubmenu(oActiveMenu);
menuNav._focusItem(oSubmenu.previous());
}
});
}
}
else {
if (oActiveItem) {
oMenu = getParentMenu(oActiveItem);
if (!menuNav._isRoot(oMenu)) {
menuNav._focusItem(oMenu.previous());
}
}
}
}
},
/**
* @method _onMenuLabelMouseOver
* @description "mouseover" event handler for a menu label.
* @protected
* @param {Node} menuLabel Node instance representing a menu label.
* @param {Object} event Object representing the DOM event.
*/
_onMenuLabelMouseOver: function (menuLabel, event) {
var menuNav = this,
oActiveMenu = menuNav._activeMenu,
bIsRoot = menuNav._isRoot(oActiveMenu),
bUseAutoSubmenuDisplay = (menuNav._autoSubmenuDisplay && bIsRoot || !bIsRoot),
oSubmenu;
menuNav._setActiveItem(menuLabel);
menuNav._focusItem(menuLabel);
if (bUseAutoSubmenuDisplay && !menuNav._movingToSubmenu) {
menuNav._cancelHideSubmenuTimer();
menuNav._cancelShowSubmenuTimer();
if (!hasVisibleSubmenu(menuLabel)) {
oSubmenu = menuLabel.next();
if (oSubmenu) {
menuNav._hideAllSubmenus(oActiveMenu);
menuNav._showSubmenuTimer =
later(menuNav._submenuShowDelay, menuNav,
menuNav._showMenu, oSubmenu);
}
}
}
},
/**
* @method _onMenuLabelMouseOut
* @description "mouseout" event handler for a menu label.
* @protected
* @param {Node} menuLabel Node instance representing a menu label.
* @param {Object} event Object representing the DOM event.
*/
_onMenuLabelMouseOut: function (menuLabel, event) {
var menuNav = this,
bIsRoot = menuNav._isRoot(menuNav._activeMenu),
bUseAutoSubmenuDisplay = (menuNav._autoSubmenuDisplay && bIsRoot || !bIsRoot),
oRelatedTarget = event.relatedTarget,
oSubmenu = menuLabel.next();
menuNav._clearActiveItem();
if (bUseAutoSubmenuDisplay) {
if (menuNav._movingToSubmenu && !menuNav._showSubmenuTimer && oSubmenu) {
// If the mouse is moving diagonally toward the submenu and another submenu
// isn't in the process of being displayed (via a timer), then hide the submenu
// via a timer to give the user some time to reach the submenu.
menuNav._hideSubmenuTimer = later(menuNav._submenuHideDelay, menuNav,
menuNav._hideMenu, oSubmenu);
}
else if (!menuNav._movingToSubmenu && oSubmenu &&
!oSubmenu.contains(oRelatedTarget) && oRelatedTarget !== oSubmenu) {
// If the mouse is not moving toward the submenu, cancel any submenus that
// might be in the process of being displayed (via a timer) and hide this
// submenu immediately.
menuNav._cancelShowSubmenuTimer();
menuNav._hideMenu(oSubmenu);
}
}
},
/**
* @method _onMenuItemMouseOver
* @description "mouseover" event handler for a menuitem.
* @protected
* @param {Node} menuItem Node instance representing a menuitem.
* @param {Object} event Object representing the DOM event.
*/
_onMenuItemMouseOver: function (menuItem, event) {
var menuNav = this,
oActiveMenu = menuNav._activeMenu,
bIsRoot = menuNav._isRoot(oActiveMenu),
bUseAutoSubmenuDisplay = (menuNav._autoSubmenuDisplay && bIsRoot || !bIsRoot);
menuNav._setActiveItem(menuItem);
menuNav._focusItem(menuItem);
if (bUseAutoSubmenuDisplay && !menuNav._movingToSubmenu) {
menuNav._hideAllSubmenus(oActiveMenu);
}
},
/**
* @method _onMenuItemMouseOut
* @description "mouseout" event handler for a menuitem.
* @protected
* @param {Node} menuItem Node instance representing a menuitem.
* @param {Object} event Object representing the DOM event.
*/
_onMenuItemMouseOut: function (menuItem, event) {
this._clearActiveItem();
},
/**
* @method _onVerticalMenuKeyDown
* @description "keydown" event handler for vertical menus of a MenuNav.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_onVerticalMenuKeyDown: function (event) {
var menuNav = this,
oActiveMenu = menuNav._activeMenu,
oRootMenu = menuNav._rootMenu,
oTarget = event.target,
oFocusedItem = getItem(oTarget, TRUE),
bPreventDefault = FALSE,
nKeyCode = event.keyCode,
oSubmenu,
oParentMenu,
oLI,
oNextItem,
oItem;
switch (nKeyCode) {
case 37: // left arrow
oParentMenu = getParentMenu(oActiveMenu);
if (oParentMenu && isHorizontalMenu(oParentMenu)) {
menuNav._hideMenu(oActiveMenu);
oLI = getPreviousSibling(oActiveMenu.get(PARENT_NODE));
oItem = getItem(oLI);
if (oItem) {
if (isMenuLabel(oItem)) { // Menu label
oSubmenu = oItem.next();
if (oSubmenu) {
menuNav._showMenu(oSubmenu);
menuNav._setActiveItem(getFirstItem(oSubmenu));
}
else {
menuNav._setActiveItem(oItem);
focusItem(oItem);
}
}
else { // MenuItem
menuNav._setActiveItem(oItem);
focusItem(oItem);
}
}
}
else if (!menuNav._isRoot(oActiveMenu)) {
menuNav._hideMenu(oActiveMenu, TRUE);
}
bPreventDefault = TRUE;
break;
case 39: // right arrow
if (isMenuLabel(oTarget)) {
oSubmenu = oTarget.next();
if (oSubmenu) {
menuNav._showMenu(oSubmenu);
menuNav._setActiveItem(getFirstItem(oSubmenu));
}
}
else if (isHorizontalMenu(oRootMenu)) {
oSubmenu = menuNav._getTopmostSubmenu(oActiveMenu);
oLI = getNextSibling(oSubmenu.get(PARENT_NODE));
oItem = getItem(oLI);
menuNav._hideAllSubmenus(oRootMenu);
if (oItem) {
if (isMenuLabel(oItem)) { // Menu label
oSubmenu = oItem.next();
if (oSubmenu) {
menuNav._showMenu(oSubmenu);
menuNav._setActiveItem(getFirstItem(oSubmenu));
}
else {
menuNav._setActiveItem(oItem);
focusItem(oItem);
}
}
else { // MenuItem
menuNav._setActiveItem(oItem);
focusItem(oItem);
}
}
}
bPreventDefault = TRUE;
break;
case 38: // up arrow
case 40: // down arrow
menuNav._hideAllSubmenus(oActiveMenu);
oNextItem = nKeyCode === 38 ?
getPreviousItem(oFocusedItem) : getNextItem(oFocusedItem);
menuNav._setActiveItem(oNextItem);
focusItem(oNextItem);
bPreventDefault = TRUE;
break;
}
if (bPreventDefault) {
// Prevent the browser from scrolling the window
event.preventDefault();
}
},
/**
* @method _onHorizontalMenuKeyDown
* @description "keydown" event handler for horizontal menus of a MenuNav.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_onHorizontalMenuKeyDown: function (event) {
var menuNav = this,
oActiveMenu = menuNav._activeMenu,
oTarget = event.target,
oFocusedItem = getItem(oTarget, TRUE),
bPreventDefault = FALSE,
nKeyCode = event.keyCode,
oNextItem,
oSubmenu;
switch (nKeyCode) {
case 37: // left arrow
case 39: // right arrow
menuNav._hideAllSubmenus(oActiveMenu);
oNextItem = nKeyCode === 37 ?
getPreviousItem(oFocusedItem) : getNextItem(oFocusedItem);
menuNav._setActiveItem(oNextItem);
focusItem(oNextItem);
bPreventDefault = TRUE;
break;
case 40: // down arrow
menuNav._hideAllSubmenus(oActiveMenu);
if (isMenuLabel(oFocusedItem)) {
oSubmenu = oFocusedItem.next();
if (oSubmenu) {
menuNav._showMenu(oSubmenu);
menuNav._setActiveItem(getFirstItem(oSubmenu));
}
bPreventDefault = TRUE;
}
break;
}
if (bPreventDefault) {
// Prevent the browser from scrolling the window
event.preventDefault();
}
},
// Generic DOM Event handlers
/**
* @method _onMouseMove
* @description "mousemove" event handler for the MenuNav.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_onMouseMove: function (event) {
var menuNav = this;
// Using a timer to set the value of the "_currentMouseX" property helps improve the
// reliability of the calculation used to set the value of the "_movingToSubmenu"
// property - especially in Opera.
later(10, menuNav, function () {
menuNav._currentMouseX = event.pageX;
});
},
/**
* @method _onMouseOver
* @description "mouseover" event handler for the MenuNav.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_onMouseOver: function (event) {
var menuNav = this,
oTarget,
oMenu,
oMenuLabel,
oParentMenu,
oMenuItem;
if (menuNav._blockMouseEvent) {
menuNav._blockMouseEvent = FALSE;
}
else {
oTarget = event.target;
oMenu = getMenu(oTarget, TRUE);
oMenuLabel = getMenuLabel(oTarget, TRUE);
oMenuItem = getMenuItem(oTarget, TRUE);
if (handleMouseOverForNode(oMenu, oTarget)) {
menuNav._onMenuMouseOver(oMenu, event);
oMenu[HANDLED_MOUSEOVER] = TRUE;
oMenu[HANDLED_MOUSEOUT] = FALSE;
oParentMenu = getParentMenu(oMenu);
if (oParentMenu) {
oParentMenu[HANDLED_MOUSEOUT] = TRUE;
oParentMenu[HANDLED_MOUSEOVER] = FALSE;
}
}
if (handleMouseOverForNode(oMenuLabel, oTarget)) {
menuNav._onMenuLabelMouseOver(oMenuLabel, event);
oMenuLabel[HANDLED_MOUSEOVER] = TRUE;
oMenuLabel[HANDLED_MOUSEOUT] = FALSE;
}
if (handleMouseOverForNode(oMenuItem, oTarget)) {
menuNav._onMenuItemMouseOver(oMenuItem, event);
oMenuItem[HANDLED_MOUSEOVER] = TRUE;
oMenuItem[HANDLED_MOUSEOUT] = FALSE;
}
}
},
/**
* @method _onMouseOut
* @description "mouseout" event handler for the MenuNav.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_onMouseOut: function (event) {
var menuNav = this,
oActiveMenu = menuNav._activeMenu,
bMovingToSubmenu = FALSE,
oTarget,
oRelatedTarget,
oMenu,
oMenuLabel,
oSubmenu,
oMenuItem;
menuNav._movingToSubmenu = (oActiveMenu && !isHorizontalMenu(oActiveMenu) &&
((event.pageX - 5) > menuNav._currentMouseX));
oTarget = event.target;
oRelatedTarget = event.relatedTarget;
oMenu = getMenu(oTarget, TRUE);
oMenuLabel = getMenuLabel(oTarget, TRUE);
oMenuItem = getMenuItem(oTarget, TRUE);
if (handleMouseOutForNode(oMenuLabel, oRelatedTarget)) {
menuNav._onMenuLabelMouseOut(oMenuLabel, event);
oMenuLabel[HANDLED_MOUSEOUT] = TRUE;
oMenuLabel[HANDLED_MOUSEOVER] = FALSE;
}
if (handleMouseOutForNode(oMenuItem, oRelatedTarget)) {
menuNav._onMenuItemMouseOut(oMenuItem, event);
oMenuItem[HANDLED_MOUSEOUT] = TRUE;
oMenuItem[HANDLED_MOUSEOVER] = FALSE;
}
if (oMenuLabel) {
oSubmenu = oMenuLabel.next();
if (oSubmenu && (oRelatedTarget === oSubmenu || oSubmenu.contains(oRelatedTarget))) {
bMovingToSubmenu = TRUE;
}
}
if (handleMouseOutForNode(oMenu, oRelatedTarget) || bMovingToSubmenu) {
menuNav._onMenuMouseOut(oMenu, event);
oMenu[HANDLED_MOUSEOUT] = TRUE;
oMenu[HANDLED_MOUSEOVER] = FALSE;
}
},
/**
* @method _toggleSubmenuDisplay
* @description "mousedown," "keydown," and "click" event handler for the MenuNav used to
* toggle the display of a submenu.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_toggleSubmenuDisplay: function (event) {
var menuNav = this,
oTarget = event.target,
oMenuLabel = getMenuLabel(oTarget, TRUE),
sType = event.type,
oAnchor,
oSubmenu,
sHref,
nHashPos,
nLen,
sId;
if (oMenuLabel) {
oAnchor = isAnchor(oTarget) ? oTarget : oTarget.ancestor(isAnchor);
if (oAnchor) {
// Need to pass "2" as a second argument to "getAttribute" for IE otherwise IE
// will return a fully qualified URL for the value of the "href" attribute.
// http://msdn.microsoft.com/en-us/library/ms536429(VS.85).aspx
sHref = oAnchor.getAttribute("href", 2);
nHashPos = sHref.indexOf("#");
nLen = sHref.length;
if (nHashPos === 0 && nLen > 1) {
sId = sHref.substr(1, nLen);
oSubmenu = oMenuLabel.next();
if (oSubmenu && (oSubmenu.get(ID) === sId)) {
if (sType === MOUSEDOWN || (sType === KEYDOWN && event.keyCode === 13)) {
// The call to "preventDefault" below results in the element
// serving as the menu's label to not receive focus in Webkit,
// therefore the "_hasFocus" flag never gets set to true, meaning the
// first item in the submenu isn't focused when the submenu is
// displayed. To fix this issue, it is necessary to set the
// "_hasFocus" flag to true.
if (UA.webkit && !menuNav._hasFocus) {
menuNav._hasFocus = TRUE;
}
if (hasVisibleSubmenu(oMenuLabel)) {
menuNav._hideMenu(oSubmenu);
focusItem(oMenuLabel);
}
else {
menuNav._hideAllSubmenus(menuNav._rootMenu);
menuNav._showMenu(oSubmenu);
}
}
if (sType === CLICK) {
// Prevent the browser from following the URL of the anchor element
event.preventDefault();
}
}
}
}
}
},
/**
* @method _onKeyPress
* @description "keypress" event handler for the MenuNav.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_onKeyPress: function (event) {
switch (event.keyCode) {
case 37: // left arrow
case 38: // up arrow
case 39: // right arrow
case 40: // down arrow
// Prevent the browser from scrolling the window
event.preventDefault();
break;
}
},
/**
* @method _onKeyDown
* @description "keydown" event handler for the MenuNav.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_onKeyDown: function (event) {
var menuNav = this,
oActiveItem = menuNav._activeItem,
oTarget = event.target,
oActiveMenu = getParentMenu(oTarget),
oSubmenu;
if (oActiveMenu) {
menuNav._activeMenu = oActiveMenu;
if (isHorizontalMenu(oActiveMenu)) {
menuNav._onHorizontalMenuKeyDown(event);
}
else {
menuNav._onVerticalMenuKeyDown(event);
}
if (event.keyCode === 27) {
if (!menuNav._isRoot(oActiveMenu)) {
menuNav._hideMenu(oActiveMenu, TRUE);
event.stopPropagation();
menuNav._blockMouseEvent = UA.gecko ? TRUE : FALSE;
}
else if (oActiveItem) {
if (isMenuLabel(oActiveItem) && hasVisibleSubmenu(oActiveItem)) {
oSubmenu = oActiveItem.next();
if (oSubmenu) {
menuNav._hideMenu(oSubmenu);
}
}
else {
blurItem(oTarget);
menuNav._clearActiveItem();
}
}
}
}
},
/**
* @method _onDocMouseDown
* @description "mousedown" event handler for the owner document of the MenuNav.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_onDocMouseDown: function (event) {
var menuNav = this,
oRoot = menuNav._rootMenu,
oTarget = event.target;
if (!oRoot.compareTo(oTarget) && !oRoot.contains(oTarget)) {
menuNav._hideAllSubmenus(oRoot);
// Document doesn't receive focus in Webkit when the user mouses down on it,
// so the "_hasFocus" property won't get set to the correct value. The
// following line corrects the problem.
if (UA.webkit) {
menuNav._hasFocus = FALSE;
menuNav._clearActiveItem();
}
}
},
/**
* @method _onDocFocus
* @description "focus" event handler for the owner document of the MenuNav.
* @protected
* @param {Object} event Object representing the DOM event.
*/
_onDocFocus: function (event) {
var menuNav = this,
bUseARIA = menuNav._useARIA,
oFirstItem = menuNav._firstItem,
oActiveItem = menuNav._activeItem,
oTarget = event.target;
if (menuNav._rootMenu.contains(oTarget)) { // The menu has focus
if (!menuNav._hasFocus) { // Initial focus
// First time the menu has been focused, need to setup focused state and
// established active active descendant
menuNav._hasFocus = TRUE;
oActiveItem = getItem(oTarget, TRUE);
if (oActiveItem) {
menuNav._setActiveItem(oActiveItem);
}
}
}
else { // The menu has lost focus
menuNav._clearActiveItem();
menuNav._hasFocus = FALSE;
if (oFirstItem && bUseARIA) {
placeInDefaultTabIndex(getItemAnchor(oFirstItem));
}
}
}
};
Y.namespace('plugin');
Y.plugin.NodeMenuNav = MenuNav;