<Feature Request> Gridline Hover Label Indicator

[natashadecoste]

I am submitting a...

• [ X ] Feature request
• Design defect
• Source code defect
• Demo/documentation defect
• Other

charts version:

0.15.1

Issue description

Need a tooltip or solution to expose the label of a gridline that has been hovered.

Current behavior

Gridline tooltips display the values of all points along that label

Expected behavior

Gridline tooltip (or other solution) for exposing the X domain label on the hovered gridline.

Screenshot or recording

In above image, there are not labels on ALL gridlines, there should be a gridline hover option for exposing the missing label (s).

This feature is requested by the Watson IoT Platform team

[shixiedesign]

WIP

Does something like this serve the need of this feature?

[CynZhang]

Hi @shixiedesign, our team (IoT Platform) initiated the request. We have many cases where the x-axis is time series, but the current hover tooltip doesn't show the x label which makes the reading of the chart difficult for the user.

To illustrate the point, here's a good example. The x-axis of line chart shows dates but not all data points are labelled. The tooltip of each data point includes both x and y values.

Your proposal generally solves the problem, but the information is presented in two different places using different UI elements. Below is what we originally had in mind.