ChartView Tooltip Text

[Rafael]

Hi,

 I need to change the tooltip TEXT showed in my RadChartView serie but I have no idea of how to do this.

 

Could anyone help?

 

Thank you.

[Dimitar]

Hi Rafael,

Thank you for writing.

You can use the DataPointTooltipTextNeeded event to change the default text:

public RadForm1()
{
    InitializeComponent();


    var tooltipController = new ChartTooltipController();
    tooltipController.DataPointTooltipTextNeeded += tooltipController_DataPointTooltipTextNeeded;
    radChartView1.Controllers.Add(tooltipController);
}

void tooltipController_DataPointTooltipTextNeeded(object sender, DataPointTooltipTextNeededEventArgs e)
{
    e.Text = "MyText";
}

Please let me know if there is something else I can help you with. 

 

Regards,
Dimitar
Telerik

[Rafael]

That is it! ;)

 

Thank you!

[William]

This tooltip capability works with radChartView - does it work with radCartesianChart?

[Dimitar]

Hello William,

Yes, it does. If you are using line series, you may need to set the size of the data point:

LineSeries lineSeries2 = new LineSeries();
lineSeries2.PointSize = new SizeF(20, 20);

I hope this will be useful. Let me know if you have additional questions.

Regards,
Dimitar
Telerik by Progress

[William]

Thank you - that worked. How do I change the content of the tooltip? I need to be able to format the date, as I have done with the Trackball object (using OnTrackInfoUpdated).

[William]

Second question - I have been able to show the tooltip when I put entries into the XAML. How do I put the tooltip capability into the C# for columns that are added to the plot in the code?

[Dimitar]

Hello William,

It appears that you are using the WPF chart, however, this forum is for the WinForms chart. This is why I want to kindly ask you to post your questions in the appropriate forum section: UI for WPF Forums - Telerik Community.

Thank you for your understanding.
  
Regards,
Dimitar
Telerik by Progress

[John]

Hi,

 

I'm have a Chartview barchart and want to display the Series, Category and value in the tooltip.  How do I get the Series name from the Datapoint (or elsewhere) in the event.

Thanks,

 

John

 

[Dimitar]

John Rafael,

The following example shows how  you can achieve this:

public RadForm1()
{
    InitializeComponent();


    ChartTooltipController tooltipController = new ChartTooltipController();
    tooltipController.DataPointTooltipTextNeeded += tooltipController_DataPointTooltipTextNeeded;
    this.radChartView1.Controllers.Add(tooltipController);

}
private void tooltipController_DataPointTooltipTextNeeded(object sender, DataPointTooltipTextNeededEventArgs e)
{
    var point = e.DataPoint as CategoricalDataPoint;
    var series = point.Presenter as BarSeries;

    e.Text = string.Format("Value: {0}, Category: {1}, Series: {2}", point.Value, point.Category, series.Name);
}

Do not hesitate to contact us if you have other questions.

 

Regards,
Dimitar
Telerik by Progress

[Kalpesh]

Thank you sir for your post.

I have getting one problem that is "tooltipController_DataPointTooltipTextNeeded" is not getting fire not in mouse move or mouse click.

Need to fire manually or need to do other action to fire it ?.

[Dimitar]

Hello Kalpesh,

Make sure you are clicking on a data point. For example, you can make the points larger:

LineSeries lineSeries = new LineSeries();
lineSeries.PointSize = new SizeF(20, 20);

I hope this will be useful. Let me know if you have additional questions.

Regards,
Dimitar
Progress Telerik