Keyboard Navigation in Menu

Press Alt+W to focus the menu. Once the menu get focus, you will be able to navigate menu using keyboard keys.

示例：

代码：

					
<div class="easyui-panel" title="Menu" style="width:150px;">
	<div id="mm" data-options="inline:true" style="width:100%">
		<div onclick="javascript:alert('new')">New</div>
		<div>
			<span>Open</span>
			<div style="width:150px;">
				<div><b>Word</b></div>
				<div>Excel</div>
				<div>PowerPoint</div>
				<div>
					<span>M1</span>
					<div style="width:120px;">
						<div>sub1</div>
						<div>sub2</div>
						<div>
							<span>Sub</span>
							<div style="width:80px;">
								<div>sub21</div>
								<div>sub22</div>
								<div>sub23</div>
							</div>
						</div>
						<div>sub3</div>
					</div>
				</div>
				<div>
					<span>Window Demos</span>
					<div style="width:120px;">
						<div>Window</div>
						<div>Dialog</div>
						<div>EasyUI</div>
					</div>
				</div>
			</div>
		</div>
		<div data-options="iconCls:'icon-save'">Save</div>
		<div data-options="iconCls:'icon-print',disabled:true">Print</div>
		<div class="menu-sep"></div>
		<div>Exit</div>
	</div>
</div>
<script type="text/javascript">
		(function($){
			function getParentMenu(rootMenu, menu){
				return findParent(rootMenu);

				function findParent(pmenu){
					var p = undefined;
					$(pmenu).find('.menu-item').each(function(){
						if (!p && this.submenu){
							if ($(this.submenu)[0] == $(menu)[0]){
								p = pmenu;
							} else {
								p = findParent(this.submenu);
							}
						}
					});
					return p;
				}
			}
			function getParentItem(pmenu, menu){
				var item = undefined;
				$(pmenu).find('.menu-item').each(function(){
					if ($(this.submenu)[0] == $(menu)[0]){
						item = $(this);
						return false;
					}
				});
				return item;
			}

			$.extend($.fn.menu.methods, {
				enableNav: function(jq, rootMenu){
					var firstItemSelector = '.menu-item:not(.menu-item-disabled):first';
					var lastItemSelector = '.menu-item:not(.menu-item-disabled):last';
					return jq.each(function(){
						var menu = $(this);
						rootMenu = $(rootMenu).length ? $(rootMenu) : menu;
						menu.attr('tabindex','0').css('outline','none').unbind('.menunav').bind('keydown.menunav', function(e){
							var item = $(this).find('.menu-active');
							switch(e.keyCode){
								case 13:  // enter
									item.trigger('click');
									break;
								case 27:  // esc
									rootMenu.find('.menu-active').trigger('mouseleave');
									break;
								case 38:  // up
									var prev = item.length ? item.prevAll(firstItemSelector) : menu.find(lastItemSelector);
									prev.trigger('mouseenter');
									return false;
								case 40:  // down
									var next = item.length ? item.nextAll(firstItemSelector) : menu.find(firstItemSelector);
									next.trigger('mouseenter');
									return false;
								case 37:  // left
									var pmenu = getParentMenu(rootMenu, menu);
									if (pmenu){
										item.trigger('mouseleave');
										var pitem = getParentItem(pmenu, menu);
										if (pitem){
											pitem.trigger('mouseenter');
										}
										pmenu.focus();
									}
									return false;
								case 39:  // right
									if (item.length && item[0].submenu){
										$(item[0].submenu).menu('enableNav', rootMenu).find(firstItemSelector).trigger('mouseenter');
										$(item[0].submenu).focus();
									}
									return false;
							}
						});
					});
				}
			});
		})(jQuery);

		$(function(){
			$('#mm').menu().menu('enableNav');
			$("#demo_region").keydown(function(e){
				if (e.altKey && e.keyCode == 87){
					$('#mm').focus();
				}
			})
		})
</script>