tooltipDisplayMode: TrackballDisplayMode.groupAllPoints Error in TrackballBehavior

[Peter]

TrackballBehavior

I got the following error:

Another exception was thrown: Null check operator used on a null value

When I set

tooltipDisplayMode: TrackballDisplayMode.groupAllPoints

It only work with 'floatAllPoints'

What can be wrong?

[Sriram Kiran Senthilkumar]

Hi Peter, 

  

Greetings from Syncfusion. We have analyzed your scenario at our end, and we are not able to replicate the reported issue regarding the trackballBehavior throwing null exception when setting the tooltipDisplayMode as groupAllPoints. We have also attached the sample used for testing below and we kindly request you to replicate the reported issue in that sample and revert us so that it will be helpful in providing the solutions sooner. 

Test sample:  https://www.syncfusion.com/downloads/support/forum/168348/ze/f168348_trackablltest313718741 

  

Regards, 

Sriram Kiram 

[Felipe Werlang]

Please, I customized the trackball tooltip and need to group the points, but it returns null value.

I attached the file.

Attachment: chart_dfa89ff5.zip

[Sriram Kiran Senthilkumar]

Hi Peter, 

We have analyzed your scenario at our end, and we would like to let you know that, when the trackballDisplayMode is set to TrackballDisplayMode.groupAllPoints. then the groupingInfo field available in the TrackballDetails should be used to retrieve the trackball argument values in the trackball builder. We have also checked the provided sample and modified it accordingly to display trackball tooltip similar to your requirement when its display mode is set to groupAllPoints mode. We have attached the modified sample below for your reference. 

  

  

Sample: https://www.syncfusion.com/downloads/support/forum/168348/ze/f168348_trackablltest86044903 

  

For further reference, please check the user guide links below. 

·        https://help.syncfusion.com/flutter/cartesian-charts/trackball-crosshair#trackball-tooltip-template 

·        https://help.syncfusion.com/flutter/cartesian-charts/trackball-crosshair#trackball-grouping-mode-info 

 

Also, please check our SB trackball customization sample below for reference. 

https://flutter.syncfusion.com/#/cartesian-charts/user-interactions/trackball/customized-trackball 

 

Please check with the above attached sample and revert us if you still have further concerns. 

 

Regards, 

Sriram Kiran