<aura:registerEvent name="menuFocusChange" type="ui:menuFocusChange" description="The event fired when the menu list focus changes from one menu item to another." />
You can handle this event in a ui:menuList component instance. This example shows a menu component with two list items.
<ui:menu> <ui:menuTriggerLink aura:id="trigger" label="Contacts"/> <ui:menuList class="actionMenu" aura:id="actionMenu" menuFocusChange="{!c.handleChange}"> <ui:actionMenuItem aura:id="item1" label="All Contacts" /> <ui:actionMenuItem aura:id="item2" label="All Primary" /> </ui:menuList> </ui:menu>