FLEX如何将combobox下拉列表所选的值给columnchart

  xmlns:s="library://ns.adobe.com/flex/spark" 

  xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"

  creationComplete="init()">

import mx.controls.Alert;

import mx.controls.DataGrid;

import mx.managers.DragManager;

import mx.core.UIComponent;

import mx.collections.ArrayCollection;

import mx.events.DragEvent;

//DataGrid的数据源

[Bindable]

private var medalsAC:ArrayCollection = new ArrayCollection( [

{ Country: "美国", Gold: 35, Silver:39, Bronze: 29 },

{ Country: "中国", Gold: 99, Silver:17, Bronze: 14 },

{ Country: "日本", Gold: 32, Silver:27, Bronze: 38 },

{ Country: "韩国", Gold: 27, Silver:27, Bronze: 2 },

{ Country: "新加坡", Gold: 55, Silver:27, Bronze: 63 },

{ Country: "朝鲜", Gold: 11, Silver:21, Bronze: 16 },

{ Country: "马来西亚", Gold: 7, Silver:14, Bronze: 77 },

{ Country: "澳洲", Gold: 0, Silver:12, Bronze: 11 } 

]);

//ColumnChart的数据源, 默认为空  

[Bindable]

private var chartData:ArrayCollection = new ArrayCollection();

[Bindable]

private var menu:ContextMenu = new ContextMenu();    

//让columnChart监听拖拽事件 

private function init():void{

column.addEventListener(DragEvent.DRAG_ENTER,dragEnterHandle);

column.addEventListener(DragEvent.DRAG_DROP,dragdropHandle);

//初始化右键菜单

initMenu();

}

//初始化chart右键菜单

private function initMenu():void    

{

var clear:ContextMenuItem = new ContextMenuItem("清空图表"); 

menu.customItems.push(clear);

clear.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT,clearAction);

}    

//处理鼠标右键事件

private function clearAction(event:ContextMenuEvent):void

{

this.chartData.removeAll();

}

//因为只有DataGrid推拽，所以直接允许，如果界面上有多个控件监听拖拽事件，需要判断后允许正确的数据进入

private function dragEnterHandle(e:DragEvent):void{

DragManager.acceptDragDrop(e.currentTarget as UIComponent)

}

//拖拽放开后处理

private function dragdropHandle(e:DragEvent):void{

//往column chart的dataprovider中添加拖拽数据。

//如果只需要特定的数据进入column chart，可以先做数据筛选。

var datas: Array =  (e.dragInitiator as DataGrid).selectedItems;

for(var i:int = 0; i < datas.length; i ++)

{

//不包含已经存在的数据再添加

if(!chartData.contains(datas[i]))

{

chartData.addItem(datas[i]);

}

}

}

]]>

一个可以从datagrid拖拽到chart的例子。用combox也只是切换事件而已，希望对你有启发