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Code from Flex 4 Documentation "Using Adobe Flex 4".
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<!-- charts/DataFunctionExample.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark"
height="600">
<fx:Script>
import mx.charts.chartClasses.AxisBase;
import mx.charts.chartClasses.Series;
import mx.charts.CategoryAxis;
import mx.charts.chartClasses.IAxis;
import mx.charts.chartClasses.ChartBase;
import mx.charts.chartClasses.CartesianTransform;
// This data provider contains complex, nested objects.
[Bindable]
public var SMITH:Array = [
{month: "Aug", close: {High:45.87,Low:12.2}, open:25.19},
{month: "Sep", close: {High:45.74,Low:10.23}, open:35.29},
{month: "Oct", close: {High:45.77,Low:12.13}, open:45.19},
{month: "Nov", close: {High:46.06,Low:10.45}, open:15.59},
];
private function dataFunc(series:Series, item:Object, fieldName:String):Object {
trace("fieldName: " + fieldName);
if(fieldName == "yValue" && series.id=="highClose")
return(item.close.High);
else if(fieldName == "yValue" && series.id=="lowClose")
return(item.close.Low);
else if(fieldName == "xValue")
return(item.month);
else
return null;
}
private function catFunc(axis:AxisBase, item:Object):Object {
for (var s:String in item) {
trace(s + ":" + item[s]);
}
return(item.month);
}
</fx:Script>
<s:layout>
<s:VerticalLayout />
</s:layout>
<s:Panel title="ColumnChart">
<s:layout>
<s:VerticalLayout />
</s:layout>
<mx:ColumnChart id="chart" dataProvider="{SMITH}"
showDataTips="true" width="100%" height="100%">
<mx:horizontalAxis>
<!-- The dataFunction replaces "categoryField='month'. -->
<mx:CategoryAxis id="h1" dataFunction="catFunc" />
</mx:horizontalAxis>
<mx:series>
<!--
The dataFunction replaces yField value, which cannot drill down
into an object (close.High is not valid).
-->
<mx:ColumnSeries id="highClose" displayName="Close (High)"
dataFunction="dataFunc" />
<!--
The dataFunction replaces yField value, which cannot drill down
into an object (close.Low is not valid).
-->
<mx:ColumnSeries id="lowClose" displayName="Close (Low)"
dataFunction="dataFunc" />
</mx:series>
</mx:ColumnChart>
</s:Panel>
</s:Application>
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