HTML widgets don't appear

[joelnitta]

HTML widgets don't seem to appear in output (episodes) built with Rmd. I can't post a single reprex as it is part of a lesson repo including multiple files, but here is a permalink to the episode with the missing output.

The code chunk in question looks like this:

#| label: targets-run-hide-3
#| echo: FALSE
library(targets) # added to this issue post so this chunk works on its own
tar_dir({
  # New workflow
  tar_script({
  summ <- function(dataset) {
    summarize(dataset, mean_x = mean(x), mean_y = mean(y))
  }
  tar_option_set(packages = "dplyr")
  list(
    tar_target(my_data, data.frame(x = sample.int(100), y = sample.int(100))),
    tar_target(my_summary, summ(my_data))
  )
  })
  # Run it again
  tar_make(reporter = "silent")
  tar_visnetwork()
})

I expect to see the targets network as an HTML widget in the output like this, but instead there is just an empty space.

[zkamvar]

Thank you for the report, Joel. I believe this is an issue with external dependencies provided by HTML widgets. I ran into this once a few years ago in a hugo site and had to implement a pretty ugly solution to save the widgets in a static part of the site (see https://www.reconlearn.org/post/tutorial-post-creation.html#html-widgets-plotly-leaflet and https://github.com/reconhub/learn/tree/master/static/post/widgets/d1_2_files for the resulting widgets).

That being said, I'm almost certain that quarto and RMarkdown have good solutions in them. I hope to work on this after May.