Is it possible to put the y-axis both left and right?

[mglimmerveen]

What problem does this feature solve?

We would like to have the y-axis of a chart (with only 1 y-axis) on both left and right. This way, the user would have more context about the value of the chart on the far end of the chart.

I have tried some workarounds, looked in the documentation and asked a question on StackOverflow , but I haven't been able to achieve this, other then completely duplicating the entire series, which is undesirable of course.

Hence, I think this is a feature request.

What does the proposed API look like?

The y-axis configuration already has a position property, which has the options 'left' and 'right'. Please add option 'both'.

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[Ovilia]

So you want two axes on two sides, and they are the same?
You can set yAxis to be an array of y axes and max value should be set to make sure they are the same. Then, hide splitLine of the right axis.

[echarts-bot]

This issue is labeled with waiting-for: author.
@mglimmerveen Please give more information to get the help from the community, or close this issue if you think your problem has been fixed.

[mglimmerveen]

So you want two axes on two sides, and they are the same?
You can set yAxis to be an array of y axes and max value should be set to make sure they are the same. Then, hide splitLine of the right axis.

@Ovilia thanks for your quick reply!

I had previously tried something like this, but ran into problems with deviating values, as you mentioned. I thought that was because the min & max was automatically deducted from the series, but on second thought, I think I overlooked something. I will try again and get back shortly...

[mglimmerveen]

I can't seem to get it working. We are using "dataMin" and "dataMax" to set the scale of the y-axis, but when I duplicate the y-axis, the 2nd y-axis doesn't get rendered. I think it requires a 2nd series? (N.B. If I manually provide a min and max it does get rendered.)

Aside from that, I would say that it would be more robust and clean to just declare that you want the y-axis printed twice, rather than duplicating it manually. Wouldn't you agree?

[Ovilia]

You need an extra series binding to the second y axis and keep the two series and axes the same.

[mglimmerveen]

As I pointed out in the first post, I did try duplicating the entire series. So, yeah, that would certainly work. And I guess it might be doable in case of a small chart, but does have a negative performance impact on rendering larger data sets.

I would personally argue that this is a suboptimal solution/workaround.

[Ovilia]

Set the second series to be show: false

[echarts-bot]

This issue is closed due to not being active. Please feel free to open it again (for the author) or create a new one and reference this (for others) if you have further questions.

[mglimmerveen]

I'm sorry, I kind of forgot about this.

Nevertheless, I still do not understand why you would want me to duplicate an entire series, and then set it to show: false. It makes the code ugly, less descriptive and (most probably) also perform much less.