sparkline in datatable with tooltip

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Code in R

require(sparkline)
require(DT)
require(shiny)
require(tibble)

#### helper function for adding the tooltip
spk_tool <- function(labels) {
  htmlwidgets::JS(
    sprintf(
"function(sparkline, options, field){
  return %s[field[0].offset];
}",
    jsonlite::toJSON(labels)
    )
  )
}

# create data
spark_data1<-tribble(
  ~id,  ~spark,
#### use sparkline::spk_chr helper
####   note spk_chr build for easy usage with dplyr, summarize
  "a", spk_chr(1:3,type="bar", tooltipFormatter=spk_tool(c("C","D","E"))),
  "b", spk_chr(3:1,type="bar",tooltipFormatter=spk_tool(c("C","D","E")))
)

ui <- tagList(
  fluidPage(
    DT::dataTableOutput("tbl")
  ),
#### add dependencies for sparkline in advance
#### since we know we are using
  htmlwidgets::getDependency("sparkline", "sparkline")
) 

server <- function(input, output) {

  output$tbl <- DT::renderDataTable({
    cb <- htmlwidgets::JS('function(){debugger;HTMLWidgets.staticRender();}')

    dt <-  DT::datatable(
      as.data.frame(spark_data1),
      rownames = FALSE,
      escape = FALSE,
      options = list(
#### add the drawCallback to static render the sparklines
####   staticRender will not redraw what has already been rendered
        drawCallback =  cb
      )
    )

  })

}

shinyApp(ui = ui, server = server)