How to limit the number of selected rows?

[ramiromagno]

either by clicking on the row or the checkbox.

[glin]

There isn't a built-in way to do this, but you can kind of achieve this with Shiny, by watching row selections and overriding the user's row selection if it surpasses some limit. Here's an example of limiting row selections to 3:

library(shiny)
library(reactable)

ui <- fluidPage(
  reactableOutput("tbl"),
  verbatimTextOutput("selected")
)

server <- function(input, output, session) {
  selected <- reactiveVal()

  output$tbl <- renderReactable({
    reactable(
      mtcars,
      selection = "multiple",
      onClick = "select"
    )
  })

  # Limit to 3 row selections
  observe({
    new_selected <- req(getReactableState("tbl", "selected"))
    if (length(new_selected) <= 3) {
      selected(new_selected)
    } else {
      updateReactable("tbl", selected = selected())
    }
  })
}

shinyApp(ui, server)