[feature]: different handlers for customizability (ticktextHandler)

[druvisc]

I hope it's okay to suggest features here.

I'd like Plotly.js to expose different handlers for customization. I think currently it's only possible for events. Don't think it would be hard too implement in most cases (if a handler is defined, call it, otherwise do the usual). At least if error handling is kept to the minimum and it would be up to the user to properly define the handlers.

One of my biggest problems currently is to set up the y-axis to display si prefix scaled and padded values, so 2 decimal values are always shown, for example 60.00, 1.02k. For this purpose I have to manually calculate the tickvals and ticktext.

In an ideal scenario, there would be a ticktextHandler to whom I can attach a formatting function, receiving the corresponding tick value and returning the formatted tick text.

On a side note, could any of the contributors please point me where plotly calculates the appropriate tickvals? Turns out not to be that straightforward. I tried looking myself, but currently to no avail.

[etpinard]

Sounds like a duplicate of #1464 unless we can come up with JSON serializable equivalent.

[druvisc]

It is, sorry.

I'm unsure of the needs for the serializability, but if at some point handlers like these would become feasible, perhaps it could be possible to just ignore the handlers? Serialize the values which are serializable and if they weren't defined, use the the defaults like currently (ie, use default tickformat when it's not defined, but the ticktexHandler is).

[etpinard]

Right, what you suggest is definitely doable but not something any plotly.js dev will spend time on.

The plotly.js data / layout API is designed to be JSON serializable so that it can be used on -- even grounds -- in non-JS clients.

[etpinard]

@druvisc This issue looks stale. Closing.

If you can think of other JSON-serializable tick options we could add, feel free to open up a new issue.

Cheers.