Displaying a PieSeries item’s data when a user clicks an item in a Flex PieChart control

Charting, PieChart, PieSeries, PieSeriesItem

The following example shows how you can display the selected pie series item when the user clicks a wedge in a PieChart control.

Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/11/15/displaying-a-pieseries-items-data-when-a-user-clicks-an-item-in-a-flex-piechart-control/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.charts.series.items.PieSeriesItem;
            import mx.charts.events.ChartItemEvent;

            private function pieChart_itemClick(evt:ChartItemEvent):void {
                var psi:PieSeriesItem = evt.hitData.chartItem as PieSeriesItem;
                Alert.show("data=" + psi.item.@data + "\n" + "percentValue=" + psi.percentValue.toFixed(1) + "%", "label=" + psi.item.@label);
            }
        ]]>
    </mx:Script>

    <mx:XML id="dp">
        <products>
            <product label="Product 1" data="3" />
            <product label="Product 2" data="1" />
            <product label="Product 3" data="4" />
            <product label="Product 4" data="1" />
            <product label="Product 5" data="5" />
            <product label="Product 6" data="9" />
        </products>
    </mx:XML>

    <mx:PieChart id="pieChart"
            dataProvider="{dp.product}"
            itemClick="pieChart_itemClick(event);"
            showDataTips="true"
            height="100%"
            width="100%">
        <mx:series>
            <mx:PieSeries id="pieSeries"
                    field="@data"
                    labelPosition="callout">
                <mx:stroke>
                    <mx:Stroke color="black" weight="0" />
                </mx:stroke>
                <mx:filters>
                    <mx:Array />
                </mx:filters>
            </mx:PieSeries>
        </mx:series>
    </mx:PieChart>

</mx:Application>

View source is enabled in the following example.

5 thoughts on “Displaying a PieSeries item’s data when a user clicks an item in a Flex PieChart control”

  1. Hey Peter, I must tell you, this is really the gratest site about Flex.
    I have learned by myself and visiting this site. Congratulatios.

  3. Thank you so much for this Peter.
    This helped me get to where I needed to be.
    Here is an updated version that uses the spark components;

    >?xml version=”1.0″ encoding=”utf-8″?<

    >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”
    <

    >fx:Script<
    >![CDATA[
    import mx.charts.series.items.PieSeriesItem;
    import mx.charts.events.ChartItemEvent;

    [Bindable]
    public var chartDP:Array = [
    {wedgeName:’Pie wedge 1′, percent:45 },
    {wedgeName:’Pie wedge 2′, percent:25},
    {wedgeName:’Pie wedge 5′, percent:22},
    {wedgeName:’Pie wedge 4′, percent:8}
    ];

    private function pieChart_itemClick(evt:ChartItemEvent):void {
    var psi:PieSeriesItem = evt.hitData.chartItem as PieSeriesItem;
    myTextArea.text += “\rwedgeName: “+psi.item.wedgeName+” percent: “+ psi.item.percent;
    }
    ]]<
    >/fx:Script<

    >s:VGroup<

    >mx:PieSeries id=”pieSeries”
    field=”percent”<

    >/mx:PieSeries<
    >/mx:series<
    >/mx:PieChart>

    >s:TextArea id=”myTextArea” y=”82″ width=”350″ height=”250″ /<
    >/s:VGroup<

    >/s:Application<

  4. Here it is fixed (I hope)

    <?xml version=”1.0″ encoding=”utf-8″?>

    <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”
    >

    <fx:Script>
    <![CDATA[
    import mx.charts.series.items.PieSeriesItem;
    import mx.charts.events.ChartItemEvent;

    [Bindable]
    public var chartDP:Array = [
    {wedgeName:’Pie wedge 1′, percent:45 },
    {wedgeName:’Pie wedge 2′, percent:25},
    {wedgeName:’Pie wedge 5′, percent:22},
    {wedgeName:’Pie wedge 4′, percent:8}
    ];

    private function pieChart_itemClick(evt:ChartItemEvent):void {
    var psi:PieSeriesItem = evt.hitData.chartItem as PieSeriesItem;
    myTextArea.text += “\rwedgeName: “+psi.item.wedgeName+” percent: “+ psi.item.percent;
    }
    ]]<
    </fx:Script>

    <s:VGroup>

    <mx:PieSeries id=”pieSeries”
    field=”percent”>

    </mx:PieSeries>
    </mx:series>
    </mx:PieChart>

    <s:TextArea id=”myTextArea” y=”82″ width=”350″ height=”250″ />
    </s:VGroup>

    </s:Application>

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