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# YUI Library Examples: Menu Family: Listening For Menu Events

# Menu Family: Listening For Menu Events

This example demonstrates how to listen for DOM-related events. Interaction with the Menu will result in event information being output to the console. Please note: Disabled MenuItem instances do not fire DOM events. This is demonstrated with the MenuItem named "MenuItem 2."

Note: By default clicking outside of a Menu instance will hide it. Additionally, MenuItem instances without a submenu or a URL to navigate to will hide their parent Menu instance when clicked. Click the "Show Menu" button below to make the Menu instance visible if it is hidden.

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## Adding DOM-based event handlers to Menu and MenuItem instances.

All of the events for Menu and MenuItem (including DOM-based events such as "mouseover" or "click") are implemented as instances of Custom Event (`YAHOO.util.CustomEvent`). Please note: To listen for DOM-based events always use the provided Custom Event-based interface rather than attaching handlers directly to a Menu's DOM elements.

Add event listeners through the `subscribe` method. The following example demonstrates how to subscribe to the "show" and "hide" events:

/* Generic event handler used to log info about the DOM events for the Menu instance. */ function onMenuEvent(p_sType, p_aArgs) { var oDOMEvent = p_aArgs[0]; YAHOO.log(("Id: " + this.id + ", " + "Custom Event Type: " + p_sType + ", " + "DOM Event Type: " + oDOMEvent.type), "info", "example10"); } /* Generic event handler used to log info about the DOM events for each MenuItem instance. */ function onMenuItemEvent(p_sType, p_aArgs) { var oDOMEvent = p_aArgs[0]; YAHOO.log(("Index: " + this.index + ", " + "Group Index: " + this.groupIndex + ", " + "Custom Event Type: " + p_sType + ", " + "DOM Event Type: " + oDOMEvent.type ), "info", "example10"); } /* Instantiate a Menu: The first argument passed to the constructor is the id of the element in the page representing the Menu; the second is an object literal of configuration properties. */ var oMenu = new YAHOO.widget.Menu("basicmenu", { fixedcenter: true }); // Subscribe to the Menu instance's "itemAdded" event oMenu.subscribe("itemAdded", function (p_sType, p_aArgs) { var oMenuItem = p_aArgs[0]; /* Subscribe to each MenuItem instance's DOM events as they are added to the Menu instance. */ oMenuItem.subscribe("mouseover", onMenuItemEvent); oMenuItem.subscribe("mouseout", onMenuItemEvent); oMenuItem.subscribe("mousedown", onMenuItemEvent); oMenuItem.subscribe("mouseup", onMenuItemEvent); oMenuItem.subscribe("click", onMenuItemEvent); oMenuItem.subscribe("keydown", onMenuItemEvent); oMenuItem.subscribe("keyup", onMenuItemEvent); oMenuItem.subscribe("keypress", onMenuItemEvent); }); // Subscribe to every DOM event for the Menu instance. oMenu.subscribe("mouseover", onMenuEvent); oMenu.subscribe("mouseout", onMenuEvent); oMenu.subscribe("mousedown", onMenuEvent); oMenu.subscribe("mouseup", onMenuEvent); oMenu.subscribe("click", onMenuEvent); oMenu.subscribe("keydown", onMenuEvent); oMenu.subscribe("keyup", onMenuEvent); oMenu.subscribe("keypress", onMenuEvent); /* Add items to the Menu instance by passing an array of object literals (each of which represents a set of YAHOO.widget.MenuItem configuration properties) to the "addItems" method. */ oMenu.addItems([ "MenuItem 0", "MenuItem 1", /* Add a disabled menu item to demonstrate that disabled items do not respond to DOM events. */ { text: "MenuItem 2", disabled: true }, "MenuItem 3", "MenuItem 4" ]); /* Since this Menu instance is built completely from script, call the "render" method passing in the DOM element that it should be appended to. */ oMenu.render("rendertarget");

### YUI Logger Output:

### Menu Family Examples:

- Basic Menu From Markup
- Basic Menu From JavaScript
- Grouped Menu Items Using Markup
- Grouped Menu Items Using JavaScript
- Grouped Menu Items With Titles From Markup
- Grouped Menu Items With Titles From JavaScript
- Multi-tiered Menu From Markup
- Multi-tiered Menu From JavaScript
- Handling Menu Click Events
- Listening For Menu Events
- MenuItem Configuration Properties
- Setting Menu Configuration Properties At Runtime
- Website Left Nav With Submenus Built From Markup
- Website Left Nav With Submenus From JavaScript
- Website Top Nav With Submenus Built From Markup
- Website Top Nav With Submenus From JavaScript
- Website Left Nav Using Animation With Submenus Built From Markup
- Website Left Nav Using Animation With Submenus From JavaScript
- Website Top Nav Using Animation With Submenus Built From Markup
- Website Top Nav Using Animation With Submenus From JavaScript
- Context Menu
- Adding A Context Menu To A Table
- Adding A Context Menu To A TreeView
- OS-Style Programs Menu
- Application Menubar
- Implementing ARIA Roles and States with Menu
- Context Menu Integration (included with examples for DataTable Control (beta))
- Menu Buttons (included with examples for Button Control)
- Split Buttons (included with examples for Button Control)
- Color Picker Button (included with examples for Button Control)
- Fixed Width Menu Button (included with examples for Button Control)
- Slider Button (included with examples for Button Control)
- Using the ProfilerViewer API while Profiling the YUI Menu Control (included with examples for ProfilerViewer Control (beta))

### More Menu Family Resources:

- User's Guide (external)
- API Documentation
- Cheat Sheet PDF (external)

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