Can You Databind a Field to a Chart Series ToolTip?

[David]

Greetings,
    Can the ActiveRegionToolTip of a RadChart be databound to a value returned directly from a datasource?  I am able to set it to the X or Y value in the Chart datapoint using #Y, etc., but if the query is returning extra text in a different field, is there a way to directly feed that into the ActiveRegionToolTip?  (i.e., without resorting to server side code when the items are databound).

Thanks
Dave

[Evgenia]

Hi David,

Let's for example have a DataTable as datasouce for your Chart. You can handle the ItemDataBound event of the Chart and bind the values from a Column as ActiveRegionTooltip as shown in our demo with full source code. Here is how it's done:

protected void RadChart1_ItemDataBound(object sender, Telerik.Charting.ChartItemDataBoundEventArgs e)
       {
           if (e.SeriesItem.YValue > 30)
           {
               e.SeriesItem.ActiveRegion.Tooltip = "Attention! Temperature too high! " + '\n';
           }
           else if (e.SeriesItem.YValue < 10)
           {
               e.SeriesItem.ActiveRegion.Tooltip = "Attention! Temperature too low! " + '\n';
           }
           e.SeriesItem.ActiveRegion.Tooltip += ((DataRowView)e.DataItem)["Measurement"].ToString() + ": Temperature: " + e.SeriesItem.YValue;
       }

Regards,
Evgenia
the Telerik team

[David]

Thanks.  I was hoping for direct binding of the tooltip from a SQL data source, so that I could have the tooltip generated in a stored procedure that accesses things in the database table that wouldn't have to be passed directly to the chart.  But we can work around it this way too.

Regards
Dave