RE: [flexcoders] How do you represent missing data in a chart? Null causes error

Samuel R. Neff Thu, 05 Oct 2006 10:36:25 -0700

Looks like I spoke too soon. Empty objects don't work for missing values at the end of a line chart (they work fine for missing values at the beginning). The following examples gives this error (which is different from the error received when the value was null):

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.charts.chartClasses::NumericAxis/mapCache()
at mx.charts.series::LineSeries/mx.charts.series:LineSeries::updateMapping()
at mx.charts.chartClasses::Series/mx.charts.chartClasses:Series::validateData()
at mx.charts.series::LineSeries/describeData()
at mx.charts.chartClasses::DataTransform/describeData()
at mx.charts.chartClasses::AxisBase/mx.charts.chartClasses:AxisBase::describeData()
at mx.charts.chartClasses::NumericAxis/get mx.charts.chartClasses:NumericAxis::dataDescriptions()
at mx.charts.chartClasses::NumericAxis/::autoGenerate()
at mx.charts.chartClasses::NumericAxis/::updateCache()
at mx.charts.chartClasses::NumericAxis/update()
at mx.charts.chartClasses::NumericAxis/getLabelEstimate()
at mx.charts::AxisRenderer/::measureLabels()
at mx.charts::AxisRenderer/::calcRotationAndSpacing()
at mx.charts::AxisRenderer/adjustGutters()
at mx.charts.chartClasses::CartesianChart/::updateAxisLayout()
at mx.charts.chartClasses::CartesianChart/mx.charts.chartClasses:CartesianChart::updateDisplayList()
at mx.core::UIComponent/validateDisplayList()
at mx.managers::LayoutManager/::validateDisplayList()
at mx.managers::LayoutManager/::doPhasedInstantiation()
at Function/http://adobe.com/AS3/2006/builtin::apply()
at mx.core::UIComponent/::callLaterDispatcher2()
at mx.core::UIComponent/::callLaterDispatcher()

Any other options?

Thanks,

Sam

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">

<mx:Script>
    <![CDATA[

      private function getTestData():Array {
        var x:XML = <stats>
                <stat pat_time="0"
                      hr="140"
                      pao2_alv="38"
                      pao2_art="47" />

                <stat pat_time="5"
                      hr="149"
                      pao2_alv="41"
                      pao2_art="42" />

                <stat pat_time="10"
                      hr="112"
                      pao2_alv="15"
                      pao2_art="29" />
              </stats>;

        var a:Array = [
            x.stat[0],
            x.stat[1],
            x.stat[2],
            {},
            {} ];

        return a;
      }
    ]]>
</mx:Script>
<mx:LineChart
    id="waveform"
    width="80%"
    height="80%"
    dataProvider="{getTestData()}">

    <mx:horizontalAxis>
      <mx:CategoryAxis
        categoryField="@pat_time"
        title="Patient Time" />
    </mx:horizontalAxis>

    <mx:series>
      <mx:LineSeries yField="@hr" />
      <mx:LineSeries yField="@pao2_alv" />
      <mx:LineSeries yField="@pao2_art" />
    </mx:series>
</mx:LineChart>
</mx:Application>

From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Ely Greenfield
Sent: Thursday, October 05, 2006 12:31 PM
To: [email protected]
Subject: RE: [flexcoders] How do you represent missing data in a chart? Null causes error

Hi Sam. That surprises me. I'm pretty positive you can use Objects that are missing the appropriate property. I thought XML nodes missing the attribute would work too. If not, that sounds like a bug.

Ely.

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RE: [flexcoders] How do you represent missing data in a chart? Null causes error

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