Can graph internals be exposed to the DOM?

[julianstanley]

Right now, the visNetwork graph is all within a <canvas> tag. Is it feasible to expose elements within the graph to the DOM?

I'm asking about this feature to make it possible to test visNetwork plots with tools like Selenium (or even shinytest, which I don't think is able to interact with visNetwork at all at this time).

[bthieurmel]

vis.js use HTML canvas for rendering, and I think it's not possible to use/set other configuration

[julianstanley]

Yep, that makes sense. I suppose I can expose my graph's data for testing by setting it to the window on render:

  output$my_graph <- renderVisNetwork({
    visNetwork(
      nodes = data.frame(id = "A", label = "A")
    ) %>%
      onRender("(el, x) => {window.myData = x}")
  })

and, besides that, I'll just work on the tricks associated with automating canvas testing.

Thanks!