How to use R variables in css code chunks?

Question

The bookdown reference for SQL chunks states that:

If you need to bind the values of R variables into SQL queries, you can do so by prefacing R variable references with a ?.

But, how do you use R variables in css code chunks?

Could you post an example? It's not clear what you want: do you want a chunk that outputs CSS that affects the document, or CSS that is displayed because your document is talking about CSS as a language? — user2554330
– user2554330, Commented Dec 4, 2021 at 20:20
@user2554330 I am talking about a chunk that outputs CSS that affects the document. For example I would like to define the color of an element according to the current bootstrap theme, using something like bs_get_variables(bslib::bs_current_theme(), "primary") — Yorgos
– Yorgos, Commented Dec 4, 2021 at 20:40

user2554330 · Accepted Answer · 2021-12-04 21:49:53Z

2

If you want to output CSS code that affects the document, I'd use the glue package to do the substitutions, in an R code chunk that has echo=FALSE, results='asis'. For example,

```{r css, echo=FALSE, results='asis'}
margin <- 40

library(glue)
cat(glue(.open = "<<", .close = ">>", "
<style>
h1 {
  margin-left: <<margin>>px;
}
</style>
"))
```

would put the parts between <style> ... </style> into your document, substituting for R variables whereever it sees a variable name in double angle brackets, e.g. <<margin>> in my example.

answered Dec 4, 2021 at 21:49

user2554330

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