DT table header line thickness

Question

Again, this is probably super simple, but after spending a few hours searching I am giving up. Here is the very simple code:

library(DT)

datatable(
  iris,
  class = list(stripe = FALSE),
  style = "default",
  options = list(dom = "t"))

How to make the line below the header thicker? Or in different color (e.g. red)? Or thicker AND in different color (LOL)?

I know that I can manipulate 1st row borders but this is not what I want as in my table which rows are being shown is controlled elsewhere.

Thank you!!!

score 1 · Answer 1 · answered Jun 18 '23 at 11:50

library(DT)

headerCallback <- c(
  "function(thead, data, start, end, display){",
  "  $('th', thead).css('border-bottom', '1px solid red');",
  "}"
)

datatable(
  iris,
  class = list(stripe = FALSE),
  style = "default",
  options = list(
    dom = "t",
    headerCallback = JS(headerCallback)
  )
)

DT table header line thickness

1 Answers1