[BUG] offline Plot in Pluto results in empty Plot

[pankgeorg]

Details

In offline mode, the plotly.min.js file is being injected with a reference to the local filesystem. Since Pluto is served over http://localhost, the file:/// paths can't be loaded. (Note that Pluto static exports do work with the offline mode, since both the HTML file and the Plotly file are served over file:/// and there is no protocol mismatch).

A fix could be to follow what PlutoPlotly does and inject the library files into the Pluto frontend distribution files, which are being served over http when Pluto is running:

https://github.com/JuliaPluto/PlutoPlotly.jl/blob/8c46e64be948899059722b74b101478c83326534/src/local_plotly_library.jl#L62-L69

and

https://github.com/JuliaPluto/PlutoPlotly.jl/blob/8c46e64be948899059722b74b101478c83326534/src/show.jl#L24-L32

Backends

Plotly

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)			x
pythonplot			x
plotlyjs	x
pgfplotsx			x
unicodeplots			x
inspectdr			x
gaston			x

Versions

Plots.jl version: Plots v1.39.0
Backend version (]st -m <backend(s)>): -
Output of versioninfo():

julia> versioninfo()
Julia Version 1.9.4
Commit 8e5136fa29 (2023-11-14 08:46 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 8 × 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-14.0.6 (ORCJIT, tigerlake)
  Threads: 1 on 8 virtual cores
Environment:
  JULIA_DEPOT_PATH = D:\.julia

[fonsp]

I discussed this with @pankgeorg today, while PlutoPlotly.jl injects files into Pluto's source code, I don't think this is a good pattern, there are some alternatives that are more stable and also work in Static HTML export files, like using a data: URL instead of file:.

[fonsp]

The relevant Plots.jl code is here:

Plots.jl/src/backends/plotly.jl

Lines 1056 to 1061 in 806641a

	plotly_url() =
	if _use_local_dependencies[]
	"file:///" * _plotly_local_file_path[]
	else
	"https://cdn.plot.ly/$_plotly_min_js_filename"
	end

[fonsp]

Proposed fix in #4863