get_dt_rows: Map 'lenghtMenu' property

In teal.widgets: 'shiny' Widgets for 'teal' Applications

Map lenghtMenu property

Description

Maps the lengthMenu selected value property of DT::datatable to a shiny variable.

Usage

get_dt_rows(dt_name, dt_rows)

Arguments

dt_name	ns() of inputId of the DT::datatable
dt_rows	ns() of inputId of the variable that holds the current selected value of lengthMenu

Value

(shiny::tagList) A ⁠shiny tagList⁠.

Examples

library(shiny)
library(DT)

ui <- function(id) {
  ns <- NS(id)
  tagList(
    get_dt_rows(ns("data_table"), ns("dt_rows")),
    textOutput(ns("rows")),
    DT::DTOutput(ns("data_table"))
  )
}

# use the input$dt_rows in the Shiny Server function
server <- function(id) {
  moduleServer(id, function(input, output, session) {
    output$data_table <- DT::renderDataTable(iris)
    # Change rows selected to see the first line on the UI change
    rows <- reactive({
      paste0("Selected Rows ", input$dt_rows)
    })
    output$rows <- renderText(rows())
  })
}
if (interactive()) {
  shinyApp(
    ui = ui("my_table_module"),
    server = function(input, output, session) server("my_table_module")
  )
}

teal.widgets documentation built on June 30, 2026, 5:11 p.m.