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databind an ItemMapping FieldName

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This is a migrated thread and some comments may be shown as answers.
James
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James asked on 03 Feb 2012, 03:18 PM
Hi, I have a chart in a view that I would like to use to display 3 different types of data in different instances of the view ...so in one instance the view may be displayed to show Commission and in another  scenario the view may be used to display "Volume"  etc... I have one view which represents the chart and a view model that is used to define the data item to display (among other things) ...I would basically like to set one of the item mappings at runtime (but obviously I am using MvvM).

This is my series definition
                        <telerik:SeriesMapping>
                            <telerik:SeriesMapping.SeriesDefinition>
                                <telerik:PieSeriesDefinition 
                                    LegendDisplayMode="DataPointLabel"
                                    ShowItemLabels="False" 
                                    ShowItemToolTips="True">
                                    <telerik:PieSeriesDefinition.Appearance>
                                        <telerik:SeriesAppearanceSettings ></telerik:SeriesAppearanceSettings>
                                    </telerik:PieSeriesDefinition.Appearance>
                                </telerik:PieSeriesDefinition>
                            </telerik:SeriesMapping.SeriesDefinition>
                            <telerik:ItemMapping DataPointMember="YValue" FieldName="Commission" />
                            <telerik:ItemMapping DataPointMember="LegendLabel" FieldName="Symbol" />
                        </telerik:SeriesMapping>

and I was hoping to be able to do this (where the DataFieldName would be set in the view model depending on what that particular view instance should show  

<telerik:ItemMapping DataPointMember="YValue" FieldName="{Binding ElementName=radChart1, Path=DataContext.DataFieldName}" />

I get an error in Visual Studio, something about a null value. I have tried a number of  options for the binding but it doesn't seem to work so maybe it's not possible 


My question is should I be able to do this and if not do you have any suggestions on how to achieve what I am trying to do.

Thanks in advance

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Yavor
Telerik team
answered on 08 Feb 2012, 10:29 AM
Hello James,

Series Mappings and ItemMappings are used for configuring the chart series and are not part of the visual or the logical tree. You can data bind the SeriesMappings to your view model and modify it from there. I have prepared for you a small demo application that demonstrates this approach. Feel free to modify it as you wish.

Kind regards,
Yavor
the Telerik team
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Yavor
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