HTML export relies on local path

[erihe251]

Describe the bug
When saving the plot as HTML, the resulting file references script files by paths local to the current installation. The files are thus only usable on the computer where they were created.

To Reproduce
Steps to reproduce the behavior:

1. Go to the plot window
2. Click on Export as HTML
3. Open HTML file in editor
4. See path like: file:///C:/Users/XXX/AppData/Roaming/QGIS/QGIS3/profiles/default/python/plugins/DataPlotly/jsscripts/polyfill.min.js

Desktop:

• OS: Windows 10
• QGIS 3.18
• DataPlotly 3.7.1

Additional context
I have not used plotly, but it seems like it should be possible to either create HTML-files that rely on a copy of plotly hosted online by a CDN, or create HTML-files that contain the necessary libraries and can thus be used offline without any local depencies.

If this is not an option, I think it would be nice to mention somewhere that the HTML-files have this local depency.

[erihe251]

A quick fix is to change this line in plot_factory.py so that include_plotlyjs= is 'cdn' instead of False.

Options for include_plotlyjs can be found here.

[ghtmtt]

@erihe251 the idea to add the parameter include_plotlyjs=False was exactly meant for offline usage. Plotly main API have been enhanced quite recently. We will have a look and try to incorporate the new features.

[ghtmtt]

@erihe251 I'm converting this issue to a feature request given that the plugin works as expected and is meant to be used offline.

[erihe251]

@ghtmtt Sounds reasonable to me. I made a pull request to add a comment to the documentation.