RowGroup extension with rownames = TRUE

[isthisthat]

The RowGroup extension does not appear to work properly when rownames = TRUE. It repeats the row header for each row (even when the grouping column has the same value).
I'm aware of the support issues with DT, just filing this FYI. Thank you

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[yihui]

I'm not sure what you meant by "It repeats the row header for each row (even when the grouping column has the same value)". Here is my minimal reprex:

d = data.frame(
  Group = rep(xfun::n2w(1:3), length.out = 26),
  a = sample(26), b = letters, c = factor(rep(c('a', 'b'), 13)),
  d = Sys.Date() + 1:26, e = Sys.time() + 1000 * (1:26), row.names = LETTERS
)

DT::datatable(
  d, rownames = FALSE,
  options = list(rowGroup = list(dataSrc = 0), order = list(list(0, 'asc'))),
  extensions = 'RowGroup'
)

DT::datatable(
  d, rownames = TRUE,
  options = list(rowGroup = list(dataSrc = 1), order = list(list(1, 'asc'))),
  extensions = 'RowGroup'
)

rownames = FALSE

rownames = TRUE

[isthisthat]

Sorry that was poor triaging on my part. There is no issue with rownames. The actual issue is with colReorder and rowGroup it seems. Here is a reproducible example:

renderDT({
  datatable(setDT(data.frame(A=c(1,2,3,4),B=c(5,6,7,8),G=c("a","a","b","b"))), rownames=FALSE,
          options = list(
                         colReorder = TRUE,
                         rowGroup = list(dataSrc = 2)
          ),
          extensions = c("ColReorder", "RowGroup")
  )
}, server=TRUE)

Initially the table is row-grouped by G. When you move column A (or any column) to the place where column G was, and sort by that column, the row-grouping changes to that column, for example:

[yihui]

d = data.frame(
  A = c(1, 2, 3, 4),
  B = c(5, 6, 7, 8),
  G = c("a", "a", "b", "b")
)

DT::datatable(
  d, rownames = FALSE,
  options = list(
    colReorder = TRUE,
    rowGroup = list(dataSrc = 2)
  ),
  extensions = c("ColReorder", "RowGroup")
)

Okay, I see the problem now. Technically it shouldn't be too difficult to fix. We need to reset the dataSrc attribute for the rowGroup extension in the column-reorder event:

• https://datatables.net/reference/event/column-reorder
• https://datatables.net/reference/api/rowGroup().dataSrc()

I'm not sure if anyone wants to help. I don't have time to work on it at the moment, but can take another look in a couple of months if no one sends a PR.

[yihui]

Our great helper @mikmart has made it again! Now you can try the development version:

remotes::install_github('rstudio/DT')

[isthisthat]

I can confirm it works! Thank you so much @mikmart , you're on a roll!!

[mikmart]

Great, thanks for testing!