tourdeflexmodules/src/spark/controls/DropdownExample.mxml

<?xml version="1.0" encoding="utf-8"?>
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  this work for additional information regarding copyright ownership.
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      http://www.apache.org/licenses/LICENSE-2.0

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  distributed under the License is distributed on an "AS IS" BASIS,
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<s:Module xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx">
	
	<fx:Script>
		<![CDATA[
			import spark.events.IndexChangeEvent;
			import mx.collections.ArrayCollection;
			
			[Bindable]
			public var depts:ArrayCollection = new ArrayCollection([
				{label:"Electronics", data:1}, 
				{label:"Home Goods", data:2}, 
				{label:"Toys", data:3} ]);
			
			[Bindable]
			public var elecItems:ArrayCollection = new ArrayCollection([
				{label:"Samsung 25in TV", data:299}, 
				{label:"Panasonic Plasma", data:999}, 
				{label:"Sony LCD", data:899} ]);
			
			[Bindable]
			public var homeItems:ArrayCollection = new ArrayCollection([
				{label:"Blendtec Blender", data:399}, 
				{label:"Hoover Vaccuum", data:599}, 
				{label:"Black & Decker Toaster", data:99} ]);
			
			[Bindable]
			public var toyItems:ArrayCollection = new ArrayCollection([
				{label:"Nintendo DS", data:120}, 
				{label:"Lego's Star Wars Set", data:50}, 
				{label:"Leapfrog Leapster", data:30} ]);
			
			private function handleDepartmentSelected(event:IndexChangeEvent):void
			{
				list2.prompt="Select Item";
				list2.selectedIndex=-1; // reset so prompt shows
				if (list1.selectedIndex==0)
					list2.dataProvider=elecItems;
				else if (list1.selectedIndex==1)
					list2.dataProvider=homeItems;
				else if (list1.selectedIndex==2)
					list2.dataProvider=toyItems;
				
			}
			
		]]>
	</fx:Script>
	
	<s:Panel title="DropDownList Sample" width="100%" height="100%">
		
		<s:VGroup width="100%" height="100%" left="120" top="5">
			<s:Label text="RJ's Warehouse Price Checker" fontSize="18" />
			<s:DropDownList id="list1" width="50%" dataProvider="{depts}" labelField="label" 
							prompt="Select Category"
							change="handleDepartmentSelected(event)"/>
			<s:Label id="text2"/>
			<s:DropDownList id="list2" width="50%" labelField="label" prompt="None"/>
			<mx:Spacer height="10"/>
			<s:Label fontSize="14" color="0x336699" text="The price of item: {list2.selectedItem.label} is: ${list1.selectedItem.data}" verticalAlign="bottom"/>
		</s:VGroup>
		<s:Label top="10" right="10" width="250" verticalAlign="justify" 
					  text="The DropDownList control contains a drop-down list from which the user can select a single value. Its functionality is very similar to that of the SELECT form element in HTML.
The DropDownList control consists of the anchor button, prompt area, and drop-down-list, Use the anchor button to open and close the drop-down-list. The prompt area displays a prompt String, or the selected item in the drop-down-list."/>
	</s:Panel>
	
</s:Module>