Data Tip Function for chart

           
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
 creationComplete="initApp()" backgroundColor="#FFFFFF">
  <mx:Script>
    
    import mx.charts.events.ChartItemEvent;
    import mx.collections.ArrayCollection;
    import mx.charts.HitData;
    
    [Bindable]
    private var productSales:ArrayCollection;
 
     public function myListener(e:ChartItemEvent):void {
       var pieData:ArrayCollection = new ArrayCollection( [
         {Product: "PC", Total: e.hitData.item.PC},
         {Product: "Mac", Total: e.hitData.item.Mac},
         {Product: "Gadgets", Total: e.hitData.item.Gadgets},
        ]);
       pieChart.dataProvider=pieData;
     }
 
    private function initApp():void{
      productSales = new ArrayCollection( [
            { Quarter: "1", PC: 10000, Mac: 3000, Gadgets: 1000, Total: 14000 },
            { Quarter: "2", PC: 12000, Mac: 4000, Gadgets: 2000, Total: 18000 },
            { Quarter: "3", PC: 15000, Mac: 8000, Gadgets: 5000, Total: 28000 },
            { Quarter: "4", PC: 20000, Mac: 10000, Gadgets: 9000, Total: 39000 }
            ]);
      
      
      columnChart.addEventListener(ChartItemEvent.ITEM_CLICK,myListener);
    }
            
    public function display(data:Object, field:String, index:Number,percentValue:Number):String {
      return data.Product + ": " + data.Total;
    }

    public function dtFunc(h:HitData):String {
      return h.item.Product + "\n<B>" + h.item.Total +"</B>";
    }
  
  </mx:Script>
    
  <mx:SeriesSlide id="showPieEffect" duration="1000"/>
  <mx:Panel title="Effects" width="100%" height="100%">
    <mx:ColumnChart id="columnChart" height="100%" width="100%" showDataTips="true" dataProvider="{productSales}">
      <mx:horizontalAxis>
        <mx:CategoryAxis categoryField="Quarter"/>
      </mx:horizontalAxis>          
      <mx:series>
        <mx:ColumnSeries xField="Quarter" yField="Total" displayName="Quarter"/>
      </mx:series>
    </mx:ColumnChart>
    <mx:PieChart id="pieChart" height="100%" width="100%" showDataTips="true" dataTipFunction="dtFunc">
      <mx:series>
        <mx:PieSeries showDataEffect="{showPieEffect}" labelPosition="callout" field="Total" labelFunction="display"/>
      </mx:series>
    </mx:PieChart>
  </mx:Panel>
</mx:Application>

Related examples in the same category

1.	Using ArrayCollection Of Verbose MXML Objects for ColumnChart
2.	creates data labels for each of the columns in the ColumnChart control:
3.	Set the value of a ColumnChart control's dataTipMode property to multiple:
4.	Use these methods to cycle through the data points in a ColumnChart control.
5.	Add a CartesianDataCanvas as an annotation element to the ColumnChart control.
6.	Use the addDataChild() method to add children to the data canvas. It adds labels to each of the columns that you select in the ColumnChart control.
7.	Define a data provider on the chart control
8.	Compare yField in data provider when it fills each chart item

Data Tip Function for chart : Column Chart Data « Chart « Flex

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