R Reactable add prefix to column based on condition

Question

I have a dataframe with two columns: Condition & Value. Based on this dataframe I would like to create a reactable object. The Value column should have a prefix. It should be preceded by “Check” if the Condition column is TRUE. Unfortunately, I could not think of a solution to include a condition in the following code.

library(reactable)

df <- data.frame(
  Condition = c(TRUE, FALSE, TRUE, FALSE),
  Value = c(100, 200, 300, 400)
)

reactable(
  df,
  columns = list(
    Value = colDef(format = colFormat(prefix = "Check"))
  )
)

Here is the desired output:

Why don't you first format the dataframe before making it a reactable object? — Ifeanyi Idiaye
– Ifeanyi Idiaye, Commented Dec 18, 2024 at 13:59
@IfeanyiIdiaye Unfortunately, this is not possible in my use case. That's why I prefer a solution within colDef(). — TobKel
– TobKel, Commented Dec 18, 2024 at 14:01

Julian · Accepted Answer · 2025-01-10 15:56:34Z

1

You could use js for custom cell render:

reactable::reactable(
  df,
  columns = list(
    Value = colDef(
      cell = reactable::JS("function(data) {
        if (data.row.Condition) {
          return 'Check ' + data.value;
        }
        return data.value;
      }")
    )
  )
)

answered Jan 10 at 15:56

Julian

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