How to customize cell to show an arrow that inform if value is up or down respect last value?

Hi Biagio!
Thank you for posting your question.
 
Could you clarify for us, please, what do you mean by “the last value”? If we understand you correctly, do you want to change the content of the cell based on the difference in the previous and the current value? To make the changes in cell values we suggest using customizeCell() API call.
 
More details about your goals will help us to decide whether it’s possible to solve your task.
 
Best regards,
WebDataRocks Team

Yes. I wish to show an arrow up, down near the value if this is major or minor respect the previous value.
How to?
thanks.

Like “20 (icon Arrow Up) or “20 (icon Arrow Down)” respect last value of the same cell.

Hello Biagio,
Thank you for your feedback.
In such a case, customizeCell() approach should work the best for you.
It allows manipulating the content of the cells before they are actually drawn.
Please refer to our api reference for more information: https://www.webdatarocks.com/api/customizecell/.
Regards,
WebDataRocks Team