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Share the tooltip with a graphics but if there are no data I want to see the Dataseries Name without value on the tooltip box (I have a lot of data on my server and it’s annoying that the box became larger and smaller)

toolTip won’t be shown in case of null dataPoint. You can achieve the above requirement using toolTip contentFormatter.

As well if I could share the tooltip (or the datapoints info on the side of the legend) between two graphics it would be great!

Yes, you can sync the toolTip across multiple charts. Please take a look at this JSFiddle for the same.

I was able to show the value on the legend Text but just if i am on the dataseries.

By using the mouseover event at dataPoint level you can achieve the above requirement as shown in this JSFiddle.

What I would like as well is to organize the legend, for example the Dataseries on the secondary axes should be on the right of the graphics and the legend on the primary graphic on the left.

Sorry, this feature is not available as of now.

Shashi Ranjan
Team CanvasJS