creates data labels for each of the columns in the ColumnChart control:

           
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<!-- charts/DataLabelFunctionColumn.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        import mx.charts.ChartItem;
        import mx.charts.chartClasses.Series;
        import mx.charts.series.items.ColumnSeriesItem;
        import mx.collections.ArrayCollection;
        [Bindable]
        public var expenses:ArrayCollection = new ArrayCollection([
            {Month:"Jan", Income:2000, Expenses:1500},
            {Month:"Feb", Income:1000, Expenses:200},
            {Month:"Mar", Income:1500, Expenses:500}
            ]);
        private function setCustomLabel(element:ChartItem,series:Series):String {
            // Get a refereence to the current data element.
            var data:ColumnSeriesItem = ColumnSeriesItem(element);
            // Get a reference to the current series.
            var currentSeries:ColumnSeries = ColumnSeries(series);
            // Create a return String and format the number.
            return currentSeries.yField + ":" + " $" + nf1.format(data.yNumber);
        }
      </mx:Script>
    <mx:NumberFormatter id="nf1" useThousandsSeparator="true" />
    <mx:Panel title="Column Chart">
        <mx:ColumnChart id="myChart" dataProvider="{expenses}"
            showDataTips="true">
            <mx:horizontalAxis>
                <mx:CategoryAxis dataProvider="{expenses}"
                    categoryField="Month" />
            </mx:horizontalAxis>
            <mx:verticalAxis>
                <mx:LinearAxis minimum="0" maximum="3000" />

            </mx:verticalAxis>
            <mx:series>
                <mx:ColumnSeries labelPosition="outside" xField="Month"
                    yField="Income" displayName="Income"
                    labelFunction="setCustomLabel" />
                <mx:ColumnSeries labelPosition="outside" xField="Month"
                    yField="Expenses" displayName="Expenses"
                    labelFunction="setCustomLabel" />
            </mx:series>
        </mx:ColumnChart>
    </mx:Panel>
</mx:Application>

Related examples in the same category

1.	Using ArrayCollection Of Verbose MXML Objects for ColumnChart
2.	Set the value of a ColumnChart control's dataTipMode property to multiple:
3.	Use these methods to cycle through the data points in a ColumnChart control.
4.	Add a CartesianDataCanvas as an annotation element to the ColumnChart control.
5.	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.
6.	Define a data provider on the chart control
7.	Compare yField in data provider when it fills each chart item
8.	Data Tip Function for chart

creates data labels for each of the columns in the ColumnChart control: : Column Chart Data « Chart « Flex

Related examples in the same category