How to make the tooltip a vertical bar

[Hunam6]

Something that would look like that:

[LeeLenaleee]

You can use an external html tooltip and style it however you want to make it look like that, example: https://www.chartjs.org/docs/master/samples/tooltip/html.html

[Hunam6]

Okay thanks but I struggle to get this height, do you have an idea?

[LeeLenaleee]

you can call chart.chartArea.height, if I remember correctly that will give the height for part of the chart

[Hunam6]

That worked, thanks! I'll select your answer once I get my thing working.