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In Flex/Actionscript, I am using an <mx:MenuBar> component.  How do I register/respond to a user clicking on a submenu item that itself has another submenu (ie. children)?

Posted on 2008-06-11
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Last Modified: 2011-10-03
In Flex/Actionscript, I am using an <mx:MenuBar> component which has 3 to 4 levels of submenus.  How do I register/respond to a user clicking on a submenu item that itself has another submenu (ie. children)?  The "itemClick" event seems to only respond to submenu items that have no children (ie. descendants).  But I need to be able to register a click/selection on submenu items at all levels, not just the end children.
<mx:MenuBar id="mainMenuBar" itemClick="handleSubMenuBarClickEvent(event);">
</mx:MenuBar>

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Question by:robbersrow
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Expert Comment

by:maclema
ID: 21792446
Here is one way to accomplish this.

On roll over of each item, add a click listener to the item rolled over..
<mx:MenuBar x="10" y="10" dataProvider="{menudp.item}" labelField="@name" itemRollOver="handleItemRollOver(event)"></mx:MenuBar>
 
private function handleItemRollOver(e:MenuEvent):void {
	//add click listener's to the actual MenuBar items.
	if ( e.itemRenderer is MenuBarItem ) {
		var item:MenuBarItem = MenuBarItem(e.itemRenderer);
		if ( !item.hasEventListener(MouseEvent.CLICK) ) {
			item.addEventListener(MouseEvent.CLICK, handleItemClick);
		}
	}
	//add listeners to the menu items
	else {
		var renderer:MenuItemRenderer = MenuItemRenderer(e.itemRenderer);
		if ( !renderer.hasEventListener(MouseEvent.CLICK) ) {
			renderer.addEventListener(MouseEvent.CLICK, handleItemClick);
		}
	}
}
 
private function handleItemClick(e:MouseEvent):void {
	var item:* = e.currentTarget;
	trace(item.data);
}

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Author Comment

by:robbersrow
ID: 21881634
Thank you for your response, and sorry for my delay in getting back to you.  I tested this, and I think this solution is almost complete, but still missing the final step.  I can get the MenuBar to register the MouseEvent.CLICK both on the main menu items and sub menu items. But then there is a problem at the next step, when inside the "handleItemClick" function.  The "item.data" statement does not get me the actual "data" property of the "menuitem" from the dataprovider.  I need to be able to access properties of the submenu "menuitem" that was clicked (ie. data, label, type, children).  An example of this is in the code below, and you can see how i need to access particularly the "data" property to figure out which value to pass to the next page.
<menuitem label="MenuItem 1" data="1">
    <menuitem label="MenuItem 1-A" data="100"/>
    <menuitem label="MenuItem 1-B" data="101"/>
    <menuitem label="MenuItem 1-C" data="102"/>
</menuitem>
<menuitem label="MenuItem 2" data="2">
    <menuitem label="MenuItem 2-A" data="200"/>
    <menuitem label="MenuItem 2-B" data="201"/>
    <menuitem label="MenuItem 2-C" data="202"/>
</menuitem>
 
//OR as I am implementing the dataProvider through an ArrayCollection
 
public var menuBarArrayCollection:ArrayCollection = new ArrayCollection([
{label:"Power", data:3, children:[
    {label:"Classic", data:212},
    {label:"Gripper", data:201, children:[
        {label:"Gripper 1", data:204}, 
        {label:"Gripper 2", data:205}, 
        {label:"Gripper 3", data:206}
    ]}
]);

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Accepted Solution

by:
maclema earned 500 total points
ID: 21882564
Here is what I tried, and I can access all the properties.
<mx:Script>
	<![CDATA[
		import mx.controls.menuClasses.MenuItemRenderer;
		import mx.controls.menuClasses.MenuBarItem;
		import mx.events.MenuEvent;
		import mx.collections.ArrayCollection;
		
		public var menuBarArrayCollection:ArrayCollection = 
		new ArrayCollection([
			{label:"Power", data:3, 
				children:[
			    	{label:"Classic", data:212},
			    	{label:"Gripper", data:201, 
			    		children:[
			        		{label:"Gripper 1", data:204}, 
			        		{label:"Gripper 2", data:205}, 
			        		{label:"Gripper 3", data:206}
			    		]
			    	}
			    ]
			}
		]);
		
		private function handleItemRollOver(e:MenuEvent):void {
	        //add click listener's to the actual MenuBar items.
	        if ( e.itemRenderer is MenuBarItem ) {
	                var item:MenuBarItem = MenuBarItem(e.itemRenderer);
	                if ( !item.hasEventListener(MouseEvent.CLICK) ) {
	                        item.addEventListener(MouseEvent.CLICK, handleItemClick);
	                }
	                item.invalidateProperties();
	        }
	        //add listeners to the menu items
	        else {
	                var renderer:MenuItemRenderer = MenuItemRenderer(e.itemRenderer);
	                if ( !renderer.hasEventListener(MouseEvent.CLICK) ) {
	                        renderer.addEventListener(MouseEvent.CLICK, handleItemClick);
	                }
	                renderer.invalidateProperties();
	        }
	}
	 
	private function handleItemClick(e:MouseEvent):void {
	        var item:* = e.currentTarget;
	        trace(item.data.children);
	        trace(item.data.label);
	        trace(item.data.data);
	}
	]]>
</mx:Script>

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Author Closing Comment

by:robbersrow
ID: 31466069
This worked perfectly!  Thank you for your solution.
0
 

Author Comment

by:robbersrow
ID: 21886621
For some reason, now when I roll over the main menuBar items (not the submenu items), the background skin/color is not applied.  Do you have any idea why this might be the case?  Any suggestions would be greatly appreciated.  Thanks again for your help with this issue.
0
 

Author Comment

by:robbersrow
ID: 21886936
Please ignore my last post, I figured it out.  It was the "invalidateProperties()" method that was causing the issue.  I removed the method and it seems to work fine now.  Thanks.
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