Pie,spider mode,how can I set the ItemClick event on clicking the number

[Jayny]

Like the pic,because the part which shows 1 is two small,I hardly click on it,so I choose the spider mode,but I do wanna do something when clicking it,But how can I raise an event when I click the number,not on the part of the pie?

[Petar Marchev]

Hello Jayny,

You need to set the IsHitTestVisible property of the SeriesItemLabel  so that the label can detect mouse events. This you can do with a style. Then, in the mouse button down event of the chart area you can check if the clicked element is a SeriesItemLabel and if it is - you can select/deselect the data point. I have attached a small project to demonstrate this.

Regards,
Petar Marchev
Telerik

[Jayny]

    Thanks for your advice,but I need to show each item's name and Count,so I created set SeriesMapping -> ItemMappings and,set DataPointMember of ItemMapping,just as following:
<telerik:SeriesMapping>
                    <telerik:SeriesMapping.SeriesDefinition>
                        <telerik:PieSeriesDefinition>
                            <!--<telerik:PieSeriesDefinition.LabelSettings>
                                <telerik:RadialLabelSettings SpiderModeEnabled="True" ShowConnectors="True" />
                            </telerik:PieSeriesDefinition.LabelSettings>-->
                        </telerik:PieSeriesDefinition>
                    </telerik:SeriesMapping.SeriesDefinition>
                    <telerik:SeriesMapping.ItemMappings>
                        <!--<telerik:ItemMapping FieldName="MsgTypeName" DataPointMember="Label"></telerik:ItemMapping>-->
                        <telerik:ItemMapping FieldName="Count" DataPointMember="YValue"></telerik:ItemMapping>
                        <telerik:ItemMapping FieldName="Name" DataPointMember="LegendLabel"></telerik:ItemMapping>
                    </telerik:SeriesMapping.ItemMappings>
                </telerik:SeriesMapping>
But the structure of the pie chart at the same time changed,the behavior seemed to disappear.@Petar Marchev

[Petar Marchev]

Hello Jayny,

I am unsure why you were unable to successfully apply the solution at hand. I have attached a project based on your code where the approach is applied and when I click on an item's label - the pie slice is being selected as expected.

Regards,
Petar Marchev
Telerik