Dygraph如何始终在图例中显示值

Question

Is it possible to always show the values of the signals in the legend even when the mouse is not over the figure?

I think values appearing and disappearing when the mouse is not over the figure are a bit annoying and I would like to come up with a solution which:

• Until the user goes over the figure with the mouse, the legend shows signal names and their values at x = 0
• While the user moves the mouse on the figure the legend should work as usual (ie being interactive)
• When the mouse is no longer over the figure the legend shows last values pointed

Would it be possible to get something like this? If yes, how?

EDIT: I found out there are callbacks sensitive to mouse events. In particular, highlightCallback and unhighlightCallback may be used to obtain what I want. Unfortunately, I do not find any example that shows how to change what's shown in the legend, I've only found examples which add HTML below the figure, like in this callback example .

Answer 1

The numbers in the legend reflect the current selection. If there's no selection, there will be no numbers. So try calling setSelection in unhighlightCallback .

Alternatively, use the new legendFormatter option. (Until v2 is released, this will require you to build dygraphs from HEAD .)