# Yahoo! UI Library

### Menu 2.8.0r4

Yahoo! UI Library > menu > YAHOO.widget.Menu
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## Class YAHOO.widget.Menu - extends YAHOO.widget.Overlay

Known Subclasses:
  YAHOO.widget.MenuBar YAHOO.widget.ContextMenu

The Menu class creates a container that holds a vertical list representing a set of options or commands. Menu is the base class for all menu containers.

### Constructor

YAHOO.widget.Menu `( p_oElement , p_oConfig )`

Parameters:
  `p_oElement <String>` String specifying the id attribute of the `<div>` element of the menu.
  `p_oElement <String>` String specifying the id attribute of the `<select>` element to be used as the data source for the menu.
  `p_oElement <HTMLDivElement>` Object specifying the `<div>` element of the menu.
  `p_oElement <HTMLSelectElement>` Object specifying the `<select>` element to be used as the data source for the menu.
  `p_oConfig <Object>` Optional. Object literal specifying the configuration for the menu. See configuration class documentation for more details.

### Properties

#### _aGroupTitleElements - `private Array`

Array of HTML element used to title groups of menu items.
Default Value: []

#### _aItemGroups - `private Array`

Multi-dimensional Array representing the menu items as they are grouped in the menu.
Default Value: []

#### _aListElements - `private Array`

Array of `<ul>` elements, each of which is the parent node for each item's `<li>` element.
Default Value: []

#### _bHandledMouseOutEvent - `private Boolean`

Boolean indicating the current state of the menu's "mouseout" event.
Default Value: false

#### _bHandledMouseOverEvent - `private Boolean`

Boolean indicating the current state of the menu's "mouseover" event.
Default Value: false

#### _bStopMouseEventHandlers - `private Boolean`

Stops "mouseover," "mouseout," and "mousemove" event handlers from executing.
Default Value: false

#### _nCurrentMouseX - `private Number`

The current x coordinate of the mouse inside the area of the menu.
Default Value: 0

#### _sClassName - `private String`

The current value of the "classname" configuration attribute.
Default Value: null

#### _useHideDelay - `private Boolean`

Boolean indicating if the "mouseover" and "mouseout" event handlers used for hiding the menu via a call to "YAHOO.lang.later" have already been assigned.
Default Value: false

#### activeItem - `YAHOO.widget.MenuItem`

Object reference to the item in the menu that has is selected.
Default Value: null

#### CSS_CLASS_NAME - `final String`

String representing the CSS class(es) to be applied to the menu's `<div>` element.
Default Value: "yuimenu"

#### GROUP_TITLE_TAG_NAME - `final String`

String representing the tagname of the HTML element used to title the menu's item groups.
Default Value: H6

#### ITEM_TYPE - `final YAHOO.widget.MenuItem`

Object representing the type of menu item to instantiate and add when parsing the child nodes (either `<li>` element, `<optgroup>` element or `<option>`) of the menu's source HTML element.
Default Value: YAHOO.widget.MenuItem

#### itemData - `Array`

Array of items to be added to the menu. The array can contain strings representing the text for each item to be created, object literals representing the menu item configuration properties, or MenuItem instances. This property should be set via the constructor using the configuration object literal.
Default Value: null

#### lazyLoad - `Boolean`

Boolean indicating if the menu's "lazy load" feature is enabled. If set to "true," initialization and rendering of the menu's items will be deferred until the first time it is made visible. This property should be set via the constructor using the configuration object literal.
Default Value: false

#### OFF_SCREEN_POSITION - `final String`

Array representing the default x and y position that a menu should have when it is positioned outside the viewport by the "poistionOffScreen" method.
Default Value: "-999em"

#### parent - `YAHOO.widget.MenuItem`

Object reference to the menu's parent menu or menu item. This property can be set via the constructor using the configuration object literal.
Default Value: null

#### srcElement - `HTMLSelectElement|HTMLDivElement`

Object reference to the HTML element (either `<select>` or `<div>`) used to create the menu.
Default Value: null

#### Properties inherited from YAHOO.widget.Module:

`body, browser, cfg, contructor, DEFAULT_CONFIG, element, EVENT_TYPES, footer, header, id, imageRoot, isSecure, platform`

#### Properties inherited from YAHOO.widget.Overlay:

`CONTEXT_TRIGGERS, DEFAULT_CONFIG, EVENT_TYPES, YAHOO.widget.Overlay._initialized`

### Methods

#### _addItemToGroup

`private YAHOO.widget.MenuItem _addItemToGroup ( p_nGroupIndex , p_oItem , p_nItemIndex )`
Adds a menu item to a group.

Parameters:
  `p_nGroupIndex <Number>` Number indicating the group to which the item belongs.
  `p_oItem <YAHOO.widget.MenuItem>` Object reference for the MenuItem instance to be added to the menu.
  `p_oItem <String>` String specifying the text of the item to be added to the menu.
  `p_oItem <Object>` Object literal containing a set of menu item configuration properties.
  `p_nItemIndex <Number>` Optional. Number indicating the index at which the menu item should be added.

Returns: `YAHOO.widget.MenuItem`

#### _cancelHideDelay

`private void _cancelHideDelay ( )`
Cancels the call to "hideMenu."

Returns: `void`

#### _cancelShowDelay

`private void _cancelShowDelay ( )`
Cancels the call to the "showMenu."

Returns: `void`

#### _clearSetWidthFlag

`private void _clearSetWidthFlag ( )`
Change event listener for the "width" configuration property. This listener is added when a Menu's "width" configuration property is set by the "_setScrollHeight" method, and is used to set the "_widthSetForScroll" property to "false" if the "width" configuration property is changed after it was set by the "_setScrollHeight" method. If the "_widthSetForScroll" property is set to "false", and the "_setScrollHeight" method is in the process of tearing down scrolling functionality, it will maintain the Menu's new width rather than reseting it.

Returns: `void`

#### _configureSubmenu

`private void _configureSubmenu ( p_oItem )`
Subscribes the menu item's submenu to its parent menu's events.

Parameters:
  `p_oItem <YAHOO.widget.MenuItem>` Object reference for the MenuItem instance with the submenu to be configured.

Returns: `void`

#### _createItemGroup

`private Array _createItemGroup ( p_nIndex )`
Creates a new menu item group (array) and its associated `<ul>` element. Returns an aray of menu item groups.

Parameters:
  `p_nIndex <Number>` Number indicating the group to create.

Returns: `Array`

#### _disableScrollFooter

`protected void _disableScrollFooter ( )`
Disables the footer used for scrolling the body of the menu.

Returns: `void`

#### _disableScrollHeader

`protected void _disableScrollHeader ( )`
Disables the header used for scrolling the body of the menu.

Returns: `void`

#### _enableScrollFooter

`protected void _enableScrollFooter ( )`
Enables the footer used for scrolling the body of the menu.

Returns: `void`

#### _enableScrollHeader

`protected void _enableScrollHeader ( )`
Enables the header used for scrolling the body of the menu.

Returns: `void`

#### _execHideDelay

`private void _execHideDelay ( )`
Hides the menu after the number of milliseconds specified by the "hidedelay" configuration property.

Returns: `void`

#### _execSubmenuHideDelay

`private void _execSubmenuHideDelay ( p_oSubmenu , p_nMouseX , p_nHideDelay )`
Hides a submenu after the number of milliseconds specified by the "submenuhidedelay" configuration property have ellapsed.

Parameters:
  `p_oSubmenu <YAHOO.widget.Menu>` Object specifying the submenu that should be hidden.
  `p_nMouseX <Number>` The x coordinate of the mouse when it left the specified submenu's parent menu item.
  `p_nHideDelay <Number>` The number of milliseconds that should ellapse before the submenu is hidden.

Returns: `void`

#### _getFirstEnabledItem

`private YAHOO.widget.MenuItem _getFirstEnabledItem ( )`
Returns the first enabled item in the menu.

Returns: `YAHOO.widget.MenuItem`

#### _getItemGroup

`private Array _getItemGroup ( p_nIndex )`
Returns the menu item group at the specified index.

Parameters:
  `p_nIndex <Number>` Number indicating the index of the menu item group to be retrieved.

Returns: `Array`

#### _initSubTree

`private void _initSubTree ( )`
Iterates the childNodes of the source element to find nodes used to instantiate menu and menu items.

Returns: `void`

#### _onBeforeHide

`private void _onBeforeHide ( p_sType , p_aArgs )`
"beforehide" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onBeforeRender

`private void _onBeforeRender ( p_sType , p_aArgs )`
"beforerender" event handler for the menu. Appends all of the `<ul>`, `<li>` and their accompanying title elements to the body element of the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onBeforeShow

`private void _onBeforeShow ( p_sType , p_aArgs )`
"beforeshow" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onBlur

`protected void _onBlur ( p_sType , p_aArgs )`
"blur" event handler for a Menu instance.

Parameters:
  `p_sType <String>` The name of the event that was fired.
  `p_aArgs <Array>` Collection of arguments sent when the event was fired.

Returns: `void`

#### _onClick

`protected void _onClick ( p_sType , p_aArgs )`
"click" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onHide

`private void _onHide ( p_sType , p_aArgs )`
"hide" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onInit

`private void _onInit ( p_sType , p_aArgs )`
"init" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onItemAdded

`private void _onItemAdded ( p_sType , p_aArgs )`
"itemadded" event handler for a Menu instance.

Parameters:
  `p_sType <String>` The name of the event that was fired.
  `p_aArgs <Array>` Collection of arguments sent when the event was fired.

Returns: `void`

#### _onKeyDown

`protected void _onKeyDown ( p_sType , p_aArgs )`
"keydown" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onKeyPress

`protected void _onKeyPress ( p_sType , p_aArgs )`
"keypress" event handler for a Menu instance.

Parameters:
  `p_sType <String>` The name of the event that was fired.
  `p_aArgs <Array>` Collection of arguments sent when the event was fired.

Returns: `void`

#### _onMenuItemConfigChange

`private void _onMenuItemConfigChange ( p_sType , p_aArgs , p_oItem )`
"configchange" event handler for the menu's items.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.
  `p_oItem <YAHOO.widget.MenuItem>` Object representing the menu item that fired the event.

Returns: `void`

#### _onMenuItemDestroy

`private void _onMenuItemDestroy ( p_sType , p_aArgs , p_oItem )`
"destroy" event handler for the menu's items.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.
  `p_oItem <YAHOO.widget.MenuItem>` Object representing the menu item that fired the event.

Returns: `void`

#### _onMouseMove

`protected void _onMouseMove ( p_oEvent , p_oMenu )`
"click" event handler for the menu.

Parameters:
  `p_oEvent <Event>` Object representing the DOM event object passed back by the event utility (YAHOO.util.Event).
  `p_oMenu <YAHOO.widget.Menu>` Object representing the menu that fired the event.

Returns: `void`

#### _onMouseOut

`protected void _onMouseOut ( p_sType , p_aArgs )`
"mouseout" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onMouseOver

`protected void _onMouseOver ( p_sType , p_aArgs )`
"mouseover" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onParentMenuConfigChange

`private void _onParentMenuConfigChange ( p_sType , p_aArgs , p_oSubmenu )`
"configchange" event handler for a submenu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.
  `p_oSubmenu <YAHOO.widget.Menu>` Object representing the submenu that subscribed to the event.

Returns: `void`

#### _onParentMenuRender

`private void _onParentMenuRender ( p_sType , p_aArgs , p_oSubmenu )`
"render" event handler for a submenu. Renders a submenu in response to the firing of its parent's "render" event.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.
  `p_oSubmenu <YAHOO.widget.Menu>` Object representing the submenu that subscribed to the event.

Returns: `void`

#### _onRender

`private void _onRender ( p_sType , p_aArgs )`
"render" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onScrollTargetMouseOut

`protected void _onScrollTargetMouseOut ( p_oEvent , p_oMenu )`
"mouseout" event handler for the menu's "header" and "footer" elements. Used to stop scrolling the body of the menu up and down when the menu's "maxheight" configuration property is set to a value greater than 0.

Parameters:
  `p_oEvent <Event>` Object representing the DOM event object passed back by the event utility (YAHOO.util.Event).
  `p_oMenu <YAHOO.widget.Menu>` Object representing the menu that fired the event.

Returns: `void`

#### _onScrollTargetMouseOver

`protected void _onScrollTargetMouseOver ( p_oEvent , p_oMenu )`
"mouseover" event handler for the menu's "header" and "footer" elements. Used to scroll the body of the menu up and down when the menu's "maxheight" configuration property is set to a value greater than 0.

Parameters:
  `p_oEvent <Event>` Object representing the DOM event object passed back by the event utility (YAHOO.util.Event).
  `p_oMenu <YAHOO.widget.Menu>` Object representing the menu that fired the event.

Returns: `void`

#### _onShow

`private void _onShow ( p_sType , p_aArgs )`
"show" event handler for the menu.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onVisibleChange

`private void _onVisibleChange ( p_sType , p_aArgs )`
Change event handler for the the menu's "visible" configuration property.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.

Returns: `void`

#### _onYChange

`protected void _onYChange ( p_sType , p_aArgs )`
"y" event handler for a Menu instance.

Parameters:
  `p_sType <String>` The name of the event that was fired.
  `p_aArgs <Array>` Collection of arguments sent when the event was fired.

Returns: `void`

#### _removeItemFromGroupByIndex

`private YAHOO.widget.MenuItem _removeItemFromGroupByIndex ( p_nGroupIndex , p_nItemIndex )`
Removes a menu item from a group by index. Returns the menu item that was removed.

Parameters:
  `p_nGroupIndex <Number>` Number indicating the group to which the menu item belongs.
  `p_nItemIndex <Number>` Number indicating the index of the menu item to be removed.

Returns: `YAHOO.widget.MenuItem`

#### _removeItemFromGroupByValue

`private YAHOO.widget.MenuItem _removeItemFromGroupByValue ( p_nGroupIndex , p_oItem )`
Removes a menu item from a group by reference. Returns the menu item that was removed.

Parameters:
  `p_nGroupIndex <Number>` Number indicating the group to which the menu item belongs.
  `p_oItem <YAHOO.widget.MenuItem>` Object reference for the MenuItem instance to be removed.

Returns: `YAHOO.widget.MenuItem`

#### _setMaxHeight

`private void _setMaxHeight ( p_sType , p_aArgs , p_nMaxHeight )`
"renderEvent" handler used to defer the setting of the "maxheight" configuration property until the menu is rendered in lazy load scenarios.

Parameters:
  `p_sType <String>` The name of the event that was fired.
  `p_aArgs <Array>` Collection of arguments sent when the event was fired.
  `p_nMaxHeight <Number>` Number representing the value to set for the "maxheight" configuration property.

Returns: `void`

#### _setScrollHeight

`private void _setScrollHeight ( p_nScrollHeight )`

Parameters:
  `p_nScrollHeight <String>` Number representing the scrolling height of the Menu.

Returns: `void`

#### _subscribeToItemEvents

`private void _subscribeToItemEvents ( p_oItem )`
Subscribes a menu to a menu item's event.

Parameters:
  `p_oItem <YAHOO.widget.MenuItem>` Object reference for the MenuItem instance whose events should be subscribed to.

Returns: `void`

#### _updateItemProperties

`private void _updateItemProperties ( p_nGroupIndex )`
Updates the "index," "groupindex," and "className" properties of the menu items in the specified group.

Parameters:
  `p_nGroupIndex <Number>` Number indicating the group of items to update.

Returns: `void`

#### addItem

`YAHOO.widget.MenuItem addItem ( p_oItem , p_nGroupIndex )`
Appends an item to the menu.

Parameters:
  `p_oItem <YAHOO.widget.MenuItem>` Object reference for the MenuItem instance to be added to the menu.
  `p_oItem <String>` String specifying the text of the item to be added to the menu.
  `p_oItem <Object>` Object literal containing a set of menu item configuration properties.
  `p_nGroupIndex <Number>` Optional. Number indicating the group to which the item belongs.

Returns: `YAHOO.widget.MenuItem`

#### addItems

`Array addItems ( p_aItems , p_nGroupIndex )`
Adds an array of items to the menu.

Parameters:
  `p_aItems <Array>` Array of items to be added to the menu. The array can contain strings specifying the text for each item to be created, object literals specifying each of the menu item configuration properties, or MenuItem instances.
  `p_nGroupIndex <Number>` Optional. Number specifying the group to which the items belongs.

Returns: `Array`

#### blur

`void blur ( )`
Causes the menu to lose focus and fires the "blur" event.

Returns: `void`

#### checkPosition

`private Boolean checkPosition ( p_sPosition )`
Checks to make sure that the value of the "position" property is one of the supported strings. Returns true if the position is supported.

Parameters:
  `p_sPosition <Object>` String specifying the position of the menu.

Returns: `Boolean`

#### clearActiveItem

`void clearActiveItem ( p_bBlur )`
Sets the "selected" configuration property of the menu's active item to "false" and hides the item's submenu.

Parameters:
  `p_bBlur <Boolean>` Boolean indicating if the menu's active item should be blurred.

Returns: `void`

#### clearContent

`void clearContent ( )`
Removes all of the content from the menu, including the menu items, group titles, header and footer.

Returns: `void`

#### configClassName

`void configClassName ( p_sType , p_aArgs , p_oMenu )`
Event handler for when the "classname" configuration property of a menu changes.

Parameters:
  `p_sType <String>` The name of the event that was fired.
  `p_aArgs <Array>` Collection of arguments sent when the event was fired.
  `p_oMenu <YAHOO.widget.Menu>` The Menu instance fired the event.

Returns: `void`

#### configContainer

`void configContainer ( p_sType , p_aArgs , p_oMenu )`
Event handler for when the "container" configuration property of the menu changes.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.
  `p_oMenu <YAHOO.widget.Menu>` Object representing the menu that fired the event.

Returns: `void`

#### configDisabled

`void configDisabled ( p_sType , p_aArgs , p_oMenu )`
Event handler for when the "disabled" configuration property of a menu changes.

Parameters:
  `p_sType <String>` The name of the event that was fired.
  `p_aArgs <Array>` Collection of arguments sent when the event was fired.
  `p_oMenu <YAHOO.widget.Menu>` The Menu instance fired the event.

Returns: `void`

#### configHideDelay

`void configHideDelay ( p_sType , p_aArgs , p_oMenu )`
Event handler for when the "hidedelay" configuration property of the menu changes.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.
  `p_oMenu <YAHOO.widget.Menu>` Object representing the menu that fired the event.

Returns: `void`

#### configIframe

`void configIframe ( p_sType , p_aArgs , p_oMenu )`
Event handler for when the "iframe" configuration property of the menu changes.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.
  `p_oMenu <YAHOO.widget.Menu>` Object representing the menu that fired the event.

Returns: `void`

#### configMaxHeight

`void configMaxHeight ( p_sType , p_aArgs , p_oMenu )`
Event handler for when the "maxheight" configuration property of a Menu changes.

Parameters:
  `p_sType <String>` The name of the event that was fired.
  `p_aArgs <Array>` Collection of arguments sent when the event was fired.
  `p_oMenu <YAHOO.widget.Menu>` The Menu instance fired the event.

Returns: `void`

#### configPosition

`void configPosition ( p_sType , p_aArgs , p_oMenu )`
Event handler for when the "position" configuration property of the menu changes.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.
  `p_oMenu <YAHOO.widget.Menu>` Object representing the menu that fired the event.

Returns: `void`

#### configShadow

`void configShadow ( p_sType , p_aArgs , p_oMenu )`
Event handler for when the "shadow" configuration property of a menu changes.

Parameters:
  `p_sType <String>` The name of the event that was fired.
  `p_aArgs <Array>` Collection of arguments sent when the event was fired.
  `p_oMenu <YAHOO.widget.Menu>` The Menu instance fired the event.

Returns: `void`

#### configVisible

`void configVisible ( p_sType , p_aArgs , p_oMenu )`
Event handler for when the "visible" configuration property the menu changes.

Parameters:
  `p_sType <String>` String representing the name of the event that was fired.
  `p_aArgs <Array>` Array of arguments sent when the event was fired.
  `p_oMenu <YAHOO.widget.Menu>` Object representing the menu that fired the event.

Returns: `void`

#### destroy

`void destroy ( )`
Removes the menu's `<div>` element (and accompanying child nodes) from the document.

Returns: `void`

#### focus

`void focus ( )`
Causes the menu to receive focus and fires the "focus" event.

Returns: `void`

#### getItem

`YAHOO.widget.MenuItem getItem ( p_nItemIndex , p_nGroupIndex )`
Returns the item at the specified index.

Parameters:
  `p_nItemIndex <Number>` Number indicating the ordinal position of the item to be retrieved.
  `p_nGroupIndex <Number>` Optional. Number indicating the group to which the item belongs.

Returns: `YAHOO.widget.MenuItem`

#### getItemGroups

`Array getItemGroups ( )`
Multi-dimensional Array representing the menu items as they are grouped in the menu.

Returns: `Array`

#### getItems

`Array getItems ( )`
Returns an array of all of the items in the menu.

Returns: `Array`

#### getRoot

`void getRoot ( )`
Finds the menu's root menu.

Returns: `void`

#### getSubmenus

`Array getSubmenus ( )`
Returns an array of all of the submenus that are immediate children of the menu.

Returns: `Array`

#### hasFocus

`Boolean hasFocus ( )`
Returns a boolean indicating whether or not the menu has focus.

Returns: `Boolean`

#### init

`void init ( p_oElement , p_oConfig )`
The Menu class's initialization method. This method is automatically called by the constructor, and sets up all DOM references for pre-existing markup, and creates required markup if it is not already present.

Parameters:
  `p_oElement <String>` String specifying the id attribute of the `<div>` element of the menu.
  `p_oElement <String>` String specifying the id attribute of the `<select>` element to be used as the data source for the menu.
  `p_oElement <HTMLDivElement>` Object specifying the `<div>` element of the menu.
  `p_oElement <HTMLSelectElement>` Object specifying the `<select>` element to be used as the data source for the menu.
  `p_oConfig <Object>` Optional. Object literal specifying the configuration for the menu. See configuration class documentation for more details.

Returns: `void`

#### initDefaultConfig

`void initDefaultConfig ( )`
Initializes the class's configurable properties which can be changed using the menu's Config object ("cfg").

Returns: `void`

#### initEvents

`void initEvents ( )`
Initializes the custom events for the menu.

Returns: `void`

#### insertItem

`YAHOO.widget.MenuItem insertItem ( p_oItem , p_nItemIndex , p_nGroupIndex )`
Inserts an item into the menu at the specified index.

Parameters:
  `p_oItem <YAHOO.widget.MenuItem>` Object reference for the MenuItem instance to be added to the menu.
  `p_oItem <String>` String specifying the text of the item to be added to the menu.
  `p_oItem <Object>` Object literal containing a set of menu item configuration properties.
  `p_nItemIndex <Number>` Number indicating the ordinal position at which the item should be added.
  `p_nGroupIndex <Number>` Optional. Number indicating the group to which the item belongs.

Returns: `YAHOO.widget.MenuItem`

#### positionOffScreen

`void positionOffScreen ( )`
Positions the menu outside of the boundaries of the browser's viewport. Called automatically when a menu is hidden to ensure that it doesn't force the browser to render uncessary scrollbars.

Returns: `void`

#### removeItem

`YAHOO.widget.MenuItem removeItem ( p_oObject , p_nGroupIndex )`
Removes the specified item from the menu.

Parameters:
  `p_oObject <YAHOO.widget.MenuItem>` Object reference for the MenuItem instance to be removed from the menu.
  `p_oObject <Number>` Number specifying the index of the item to be removed.
  `p_nGroupIndex <Number>` Optional. Number specifying the group to which the item belongs.

Returns: `YAHOO.widget.MenuItem`

#### setInitialFocus

`void setInitialFocus ( )`
Sets focus to the menu's first enabled item.

Returns: `void`

#### setInitialSelection

`void setInitialSelection ( )`
Sets the "selected" configuration property of the menu's first enabled item to "true."

Returns: `void`

#### setItemGroupTitle

`void setItemGroupTitle ( p_sGroupTitle , p_nGroupIndex )`
Sets the title of a group of menu items.

Parameters:
  `p_sGroupTitle <String>` String specifying the title of the group.
  `p_nGroupIndex <Number>` Optional. Number specifying the group to which the title belongs.

Returns: `void`

#### subscribe

`void subscribe ( p_type , p_fn , p_obj , p_override )`
Adds the specified CustomEvent subscriber to the menu and each of its submenus.

Parameters:
  `p_type <string>` the type, or name of the event
  `p_fn <function>` the function to exectute when the event fires
  `p_obj <Object>` An object to be passed along when the event fires
  `p_override <boolean>` If true, the obj passed in becomes the execution scope of the listener

Returns: `void`

#### toString

`String toString ( )`
Returns a string representing the menu.

Returns: `String`

#### Methods inherited from YAHOO.widget.Module:

`_addToParent, _initResizeMonitor, _renderBody, _renderFooter, _renderHeader, _supportsCWResize, appendToBody, appendToFooter, appendToHeader, configMonitorResize, configVisible, destroy, hide, init, initDefaultConfig, initEvents, initResizeMonitor, onDomResize, render, setBody, setFooter, setHeader, show, toString`

#### Methods inherited from YAHOO.widget.Overlay:

`_alignOnTrigger, _autoFillOnHeightChange, _findTriggerCE, _getComputedHeight, _getConstrainedPos, _getPreciseHeight, _preventOverlap, _primeXYFromDOM, _processTriggers, _setDomVisibility, _validateAutoFillHeight, align, bringToTop, center, configAutoFillHeight, configConstrainToViewport, configContext, configFixedCenter, configHeight, configIframe, configVisible, configWidth, configX, configXY, configY, configzIndex, destroy, doCenterOnDOMEvent, enforceConstraints, fillHeight, fitsInViewport, forceContainerRedraw, getConstrainedX, getConstrainedXY, getConstrainedY, hideIframe, hideMacGeckoScrollbars, init, initDefaultConfig, initEvents, moveTo, onDomResize, showIframe, showMacGeckoScrollbars, stackIframe, syncIframe, syncPosition, toString`

### Events

#### clickEvent

`clickEvent ( )`
Fires when the user clicks the on the menu. Passes back the DOM Event object as an argument.

#### itemAddedEvent

`itemAddedEvent ( )`
Fires when an item is added to the menu.

#### itemRemovedEvent

`itemRemovedEvent ( )`
Fires when an item is removed to the menu.

#### keyDownEvent

`keyDownEvent ( )`
Fires when the user presses a key when one of the menu's items has focus. Passes back the DOM Event object as an argument.

#### keyPressEvent

`keyPressEvent ( )`
Fires when the user presses an alphanumeric key when one of the menu's items has focus. Passes back the DOM Event object as an argument.

#### keyUpEvent

`keyUpEvent ( )`
Fires when the user releases a key when one of the menu's items has focus. Passes back the DOM Event object as an argument.

#### mouseDownEvent

`mouseDownEvent ( )`
Fires when the user mouses down on the menu. Passes back the DOM Event object as an argument.

#### mouseOutEvent

`mouseOutEvent ( )`
Fires when the mouse has left the menu. Passes back the DOM Event object as an argument.

#### mouseOverEvent

`mouseOverEvent ( )`
Fires when the mouse has entered the menu. Passes back the DOM Event object as an argument.

#### mouseUpEvent

`mouseUpEvent ( )`
Fires when the user releases a mouse button while the mouse is over the menu. Passes back the DOM Event object as an argument.

#### Events inherited from YAHOO.widget.Module:

`appendEvent, beforeHideEvent, beforeInitEvent, beforeRenderEvent, beforeShowEvent, changeBodyEvent, changeContentEvent, changeFooterEvent, changeHeaderEvent, destroyEvent, hideEvent, initEvent renderEvent showEvent YAHOO.widget.Module.textResizeEvent`

#### Events inherited from YAHOO.widget.Overlay:

`beforeMoveEvent, moveEvent, YAHOO.widget.Overlay.windowResizeEvent, YAHOO.widget.Overlay.windowScrollEvent,`

### Configuration Attributes

#### autosubmenudisplay `- Boolean`

Boolean indicating if submenus are automatically made visible when the user mouses over the menu's items.
Default Value: true

#### classname `- String`

String representing the CSS class to be applied to the menu's root `<div>` element. The specified class(es) are appended in addition to the default class as specified by the menu's CSS_CLASS_NAME constant. When set this property is automatically applied to all submenus.
Default Value: null

#### clicktohide `- Boolean`

Boolean indicating if the menu will automatically be hidden if the user clicks outside of it. This property is only applied when the "position" configuration property is set to dynamic and is automatically applied to all submenus.
Default Value: true

#### constraintoviewport `- Boolean`

Boolean indicating if the menu will try to remain inside the boundaries of the size of viewport. This property is only applied when the "position" configuration property is set to dynamic and is automatically applied to all submenus.
Default Value: true

#### container `- HTMLElement|String`

HTML element reference or string specifying the id attribute of the HTML element that the menu's markup should be rendered into.
Default Value: document.body

#### context `- Array`

Array of context arguments for context-sensitive positioning. The format is: [id or element, element corner, context corner]. For example, setting this property to ["img1", "tl", "bl"] would align the Menu's top left corner to the context element's bottom left corner. This property is only applied when the "position" configuration property is set to dynamic.
Default Value: null

#### disabled `- Boolean`

Boolean indicating if the menu should be disabled. Disabling a menu disables each of its items. (Disabled menu items are dimmed and will not respond to user input or fire events.) Disabled menus have a corresponding "disabled" CSS class applied to their root `<div>` element.
Default Value: false

#### effect `- Object`

Object or array of objects representing the ContainerEffect classes that are active for animating the container. When set this property is automatically applied to all submenus.
Default Value: null

#### fixedcenter `- Boolean`

Boolean indicating if the Menu should be anchored to the center of the viewport. This property is only applied when the "position" configuration property is set to dynamic.
Default Value: false

#### hidedelay `- Number`

Number indicating the time (in milliseconds) that should expire before the menu is hidden. This property is only applied when the "position" configuration property is set to dynamic and is automatically applied to all submenus.
Default Value: 0

#### iframe `- Boolean`

Boolean indicating whether or not the Menu should have an IFRAME shim; used to prevent SELECT elements from poking through an Overlay instance in IE6. When set to "true", the iframe shim is created when the Menu instance is intially made visible. This property is only applied when the "position" configuration property is set to dynamic and is automatically applied to all submenus.
Default Value: true for IE6 and below, false for all other browsers.

#### keepopen `- Boolean`

Boolean indicating if the menu should remain open when clicked.
Default Value: false

#### maxheight `- Number`

Number defining the maximum height (in pixels) for a menu's body element (`<div class="bd">`). Once a menu's body exceeds this height, the contents of the body are scrolled to maintain this value. This value cannot be set lower than the value of the "minscrollheight" configuration property.
Default Value: 0

#### minscrollheight `- Number`

Number defining the minimum threshold for the "maxheight" configuration property. When set this property is automatically applied to all submenus.
Default Value: 90

#### position `- String`

String indicating how a menu should be positioned on the screen. Possible values are "static" and "dynamic." Static menus are visible by default and reside in the normal flow of the document (CSS position: static). Dynamic menus are hidden by default, reside out of the normal flow of the document (CSS position: absolute), and can overlay other elements on the screen.
Default Value: dynamic

#### preventcontextoverlap `- Boolean`

Boolean indicating whether or not a submenu should overlap its parent MenuItem when the "constraintoviewport" configuration property is set to "true".
Default Value: true

#### scrollincrement `- Number`

Number used to control the scroll speed of a menu. Used to increment the "scrollTop" property of the menu's body by when a menu's content is scrolling. When set this property is automatically applied to all submenus.
Default Value: 1

#### shadow `- Boolean`

Boolean indicating if the menu should have a shadow.
Default Value: true

#### showdelay `- Number`

Number indicating the time (in milliseconds) that should expire before a submenu is made visible when the user mouses over the menu's items. This property is only applied when the "position" configuration property is set to dynamic and is automatically applied to all submenus.
Default Value: 250

#### submenualignment `- Array`

Array defining how submenus should be aligned to their parent menu item. The format is: [itemCorner, submenuCorner]. By default a submenu's top left corner is aligned to its parent menu item's top right corner.
Default Value: ["tl","tr"]

#### submenuhidedelay `- Number`

Number indicating the time (in milliseconds) that should expire before a submenu is hidden when the user mouses out of a menu item heading in the direction of a submenu. The value must be greater than or equal to the value specified for the "showdelay" configuration property. This property is only applied when the "position" configuration property is set to dynamic and is automatically applied to all submenus.
Default Value: 250

#### visible `- Boolean`

Boolean indicating whether or not the menu is visible. If the menu's "position" configuration property is set to "dynamic" (the default), this property toggles the menu's `<div>` element's "visibility" style property between "visible" (true) or "hidden" (false). If the menu's "position" configuration property is set to "static" this property toggles the menu's `<div>` element's "display" style property between "block" (true) or "none" (false).
Default Value: false

#### x `- Number`

Number representing the absolute x-coordinate position of the Menu. This property is only applied when the "position" configuration property is set to dynamic.
Default Value: null

#### xy `- Number[]`

Array of the absolute x and y positions of the Menu. This property is only applied when the "position" configuration property is set to dynamic.
Default Value: null

#### y `- Number`

Number representing the absolute y-coordinate position of the Menu. This property is only applied when the "position" configuration property is set to dynamic.
Default Value: null

#### Configuration attributes inherited from YAHOO.widget.Module:

`appendtodocumentbody, effect, monitorresize, visible,`

#### Configuration attributes inherited from YAHOO.widget.Overlay:

`autofillheight, constraintoviewport, context, fixedcenter, height, iframe, preventcontextoverlap, width, x, xy, y, zIndex,`

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