ItemLabel and ItemTooltip Formatting

[Petr]

Hi there,

I'm having some issues with basic number formatting in chart item labels and tooltips. For example, in the following code, I would expect the values in labels/tooltips to have 2 decimal places:

public partial class MainPage : UserControl
{
    public MainPage()
    {
        InitializeComponent();
        SeriesMapping sm = new SeriesMapping() { SeriesDefinition = new BarSeriesDefinition() };
        sm.ItemMappings.Add(new ItemMapping("X", DataPointMember.XValue));
        sm.ItemMappings.Add(new ItemMapping("Y", DataPointMember.YValue));
        sm.ItemMappings.Add(new ItemMapping("Y", DataPointMember.Label));
        sm.ItemMappings.Add(new ItemMapping("Y", DataPointMember.Tooltip));
        sm.SeriesDefinition.ShowItemLabels = true;
        sm.SeriesDefinition.ItemLabelFormat = "0.00";
        sm.SeriesDefinition.ShowItemToolTips = true;
        sm.SeriesDefinition.ItemToolTipFormat = "0.00";
        radChart1.SeriesMappings.Add(sm);
        List<Data> data = new List<Data>();
        Random r = new Random();
        for (int i = 0; i < 12; i++)
        {
            data.Add(new Data()
            {
                X = i,
                Y = r.NextDouble() * 100
            });
        }
        radChart1.ItemsSource = data;
    }
}
public class Data
{
    public double X { get; set; }
    public double Y { get; set; }
}

Unfortunately, that doesn't seem to work. Am I missing something here? I'm working with version 2010.3.1110.1040.

Thank you,
Petr

[Missing User]

Hi Petr,

In order to use the RadChart specific format mechanism,
you need to specify the token and the expression in a curly braces:

seriesMapping.SeriesDefinition.ItemLabelFormat = "#Y{0.00}";
seriesMapping.SeriesDefinition.ItemToolTipFormat = "#Y{0.00}";

In this case you don't need to map a value for DataPointMember.Label and DataPointMember.Tooltip because it will override the formatted value. Another approach to display formatted text is to map it already formatted. For example:

seriesMapping.ItemMappings.Add(new ItemMapping("YValFormatted", DataPointMember.Label));
seriesMapping.ItemMappings.Add(new ItemMapping("YValFormatted", DataPointMember.Tooltip));

I hope this helps.

Best wishes,
Polina
the Telerik team