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Pie Chart creation at Run-Time not working

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Chart (Obsolete)

This is a migrated thread and some comments may be shown as answers.

Francois asked on 05 Mar 2014, 12:21 PM

Hello Telerik,

Please see this code here:.

01.Dim HBH_Chart As New RadHtmlChart

02. HBH_Chart.ID = "HBH_Chart"

03. HBH_Chart.Width = Unit.Pixel(500)

04. HBH_Chart.Height = Unit.Pixel(500)

05. HBH_Chart.Legend.Appearance.Position = HtmlChart.ChartLegendPosition.Right

06.

07. Dim HBHSeries As New PieSeries

08. HBHSeries.Name = "HBH1"

09. HBHSeries.TooltipsAppearance.DataFormatString = "{0}"

10. HBHSeries.LabelsAppearance.Visible = True

11.

12. For Each row As DataRow In dataSet.Rows

13. Dim item As New SeriesItem

14. item.YValue = row.Field(Of Integer)("AantalClienten")

15. item.Name = row.Field(Of String)("Naam")

16. item.BackgroundColor = System.Drawing.ColorTranslator.FromHtml(row.Field(Of String)("Kleur"))

17. Next

18.

19. HBH_Chart.PlotArea.Series.Clear()

20. HBH_Chart.PlotArea.Series.Add(HBHSeries)

21. HBH_Chart.PlotArea.XAxis.DataLabelsField = "Naam"

22. HBH_Chart.PlotArea.YAxis.LabelsAppearance.DataFormatString = "{0}"

23.

24. HtmlChartHolder.Controls.Clear()

25. HtmlChartHolder.Controls.Add(HBH_Chart)

I try to create a PieChart dynamically. But the only thing that I see is that it takes up it's space in the page (i.e. the placeholder is filled). But the actual chart is not visible. It's see as a white rectangle. What am I missing here?

Thanks a lot for your answer,

Best regards,
Francois

1 Answer, 1 is accepted

Accepted

answered on 10 Mar 2014, 07:01 AM

Hi Francois,

It seems like you are creating series items in the for-each loop, but you are not adding them to the PieSeries. This could be done like this:

For Each row As DataRow In dataSet.Rows

Dim item As New SeriesItem

item.YValue = row.Field(Of Integer)("AantalClienten")

item.Name = row.Field(Of String)("Naam")

item.BackgroundColor = System.Drawing.ColorTranslator.FromHtml(row.Field(Of String)("Kleur"))

HBHSeries.Items.Add(item)

Next

In addition, you should know that the Items collection is deprecated and you could use the new SeriesItems collection instead. You can find more information about it in our blog post.

Regards,
Stamo Gochev
Telerik

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