how to enable auto-formatting for time axis on zoom events with custom date-time format?

[juni-green]

Hi,
Is there any way to keep the auto-formatting enabled for time axis in plotly.js graph even after applying customized formatting using "tickformat"?
Actually, I have customized the time format using:
tickformat: "%H:%M"
such that only Hour:Minutes appear on the time axis. But by doing so, I lost the default formatting functionality that works on zoom-in/zoom-out events. Now if I zoom-in, the tick format doesn't expand to seconds or milliseconds. Is it possible to make it work like default auto-formatting functionality on zooming-in/zooming-out with the above mentioned customization?

Any help will be appreciated.
Thanks!

[etpinard]

Can you share a reproducible example using codePen / jsFiddle / jsBin?

Thank you.

[juni-green]

@etpinard
Here I've created a working example for showing date-time auto-formatting functionality in plotly.js:
https://codepen.io/juni-green/pen/zZmJbE
We can see that on zoom-in/zoom-out the x-axis tick format changes automatically e.g. on zoom-in, the tick format expands to seconds and milliseconds level.
But if I customize the format using tickformat to hide the date (which is being displayed on first x-axis tick), then I lose the default auto-formatting on zoom-in/zoom-out. It can be checked by un-commenting the tickformat: "%H:%M:%S" in layout variable.

var trace1 = { x: ["2017-02-04 22:23:00.30", "2017-02-04 22:24:30.50", "2017-02-04 22:30:00.40", "2017-02-04 22:50:00.20", "2017-02-04 22:55:30.10", "2017-02-04 23:05:00.05"], y: [0, 2, 4, 5, 6, 7], mode: "lines", type: "scatter" };
var data = [trace1];
var layout = { xaxis: { rangeslider: {}, // tickformat: "%H:%M:%S" } };
Plotly.newPlot("myDiv", data, layout);

Actually, I want to hide the date on the first tick while keeping the default formatting functionality on zoom-in/zoom-out, which enables expansion/collapse to seconds/minutes levels.
I hope this clarifies my question.

[alexcjohnson]

If I understand your goal correctly, sounds like you don't want to ever see the date, but otherwise you like the automatic time formatting we do?

This seems like a somewhat generalizable situation: you have some data where only the time is important - maybe a result of merging together many days worth of data, to see some effect that depends only on time of day.

You could also imagine a similar situation where year is arbitrary. Or any other repeated interval such as weeks, months, hours... but those might be harder to handle in a consistent, meaningful way than time within a day - even year is tricky when you consider leap years.

Seems like a reasonable feature to consider, either in a weak form (just dropping the arbitrary portions of the time from display, that would be fairly easy) or a stronger form (actually wrapping data to that period, would be a bigger project).

[etpinard]

I think #1965 essentially solves this ticket.

@juni-green can you confirm?

[etpinard]

Closing due to lack of activity.