I had the same thing. I believe it is due to the interpolate effect
not liking stacked or 100% charts. When you change the type, the
effect runs and that is what is blowing up. I had this problem with
both area and column charts. I added code to remove the effect before
changing to a stack or 100% type and that fixed it.
--- In flexcoders@yahoogroups.com, Guido <[EMAIL PROTECTED]> wrote:
>
> Hi, fellow coders!
>
> I'm having an issue with an AreaChart when changing its *type* property.
>
> There's a ComboBox that lets the user select how it wishes to see the
> AreaChart (either *overlaid*, *stacked* or *100%*).
>
> The method for this is as simple as:
>
> areaChart.type = comboBox.selectedItem.data;
>
> (I've debugged it and data holds the proper string required by the type
> property).
>
> My code is as follows:
>
>
> <mx:AreaChart id="areaChart"
>
> dataTipFunction="chartDataTipRender"
>
> height="100%"
>
> showDataTips="true"
>
> width="100%">
>
> <mx:horizontalAxis>
>
> <mx:CategoryAxis categoryField="{dataSet.keyFieldName}"
>
> dataProvider="{dataSet.dataSet}"
>
> labelFunction="{dataSet.labelFunction}"/>
>
> </mx:horizontalAxis>
>
> <mx:verticalAxis>
>
> <mx:LinearAxis
>
> minimum="{verticalAxisMinimum}"
>
> maximum="{verticalAxisMaximum}"/>
>
> </mx:verticalAxis>
>
> <mx:series>
>
> <mx:AreaSeries
>
> alpha="0.8"
>
> dataProvider="{dataSet.dataSet}"
>
> displayName="{dataSet.dataSource.name}"
>
> form="curve"
>
> showDataEffect="interpolate"
>
> xField="{dataSet.keyFieldName}"
>
> yField="{dataSet.valueFieldName}"/>
>
> </mx:series>
>
> </mx:AreaChart>
>
>
> <mx:SeriesInterpolate id="interpolate" elementOffset="10"/>
>
>
> You might wonder why I want to stack or overlay the chart, since it
has only
> one series... well, the thing is more series may be added in
runtime, and so
> it comes to play the area chart type feature.
>
>
> So, whenever I change the AreaChart's type property, I get the following
> error and stack trace:
>
> TypeError: Error #1009: Cannot access a property or method of a null
object
> reference.
> at
mx.charts.chartClasses::Series/mx.charts.chartClasses:Series::stripNaNs
> ()
> at
mx.charts.series::AreaSeries/mx.charts.series:AreaSeries::updateFilter()
> at
>
mx.charts.chartClasses::Series/mx.charts.chartClasses:Series::validateTransform
> ()
> at mx.charts.chartClasses::Series/getRenderDataForTransition()
> at mx.charts.effects.effectClasses::SeriesInterpolateInstance/play()
> at mx.effects::EffectInstance/startEffect()
> at mx.effects.effectClasses::ParallelInstance/play()
> at mx.charts.chartClasses::ChartBase/::advanceEffectState()
> at
>
mx.charts.chartClasses::ChartBase/mx.charts.chartClasses:ChartBase::updateDisplayList
> ()
> 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()
> at flash.utils::Timer/flash.utils:Timer::_timerDispatch()
> at flash.utils::Timer/flash.utils:Timer::tick()
>
>
> And... I don't understand why, since I'm already seeing the chart as
it is
> when I make the change to the type property. I mean, it works
perfectly up
> to the moment I try to change this property, then it blows up.
>
> BTW, I'm using Flex 2.
>
>
> Any help on this one?
>
> Thanks in advance!!
>
> Guido.
>
