Update tabPanel content with selection in Sidebar control

Question

I am making a very simple Shiny app, where I want to update tabPanel content with whatever is selected in sidebarMenu, no matter which tab is selected. Following is my sample code. Please let me know what I am doing wrong.

library(shinydashboard)

siderbar <- dashboardSidebar(
  sidebarMenu(
    # Add buttons to choose the way you want to select your data
    radioButtons("select_by", "Select by:",
                 c("Food Type" = "Food",
                   "Gym Type" = "Gym",
                   "TV show" = "TV"))
  )   
)

body <- dashboardBody(
  fluidRow(
    tabBox(
      side = "right",
      selected = "Tab3",
      tabPanel("Tab1", "Tab content 1"),
      tabPanel("Tab2", "Tab content 2"),
      tabPanel("Tab3", "Tab content 3")
    )
  ),
)

shinyApp(
  ui = dashboardPage(
    dashboardHeader(title = "tabBoxes"),
    siderbar,
    body
  ),
  server = function(input, output) {
    
    getReaction <- reactive(input$select_by)
    
    # The currently selected tab from the first box
    output$tabset1Selected <- renderText({
      getReaction
    })
  }
)

Answer 1

You didn't define any textOutput. Please check the following:

library(shiny)
library(shinydashboard)

siderbar <- dashboardSidebar(
  sidebarMenu(
    # Add buttons to choose the way you want to select your data
    radioButtons("select_by", "Select by:",
                 c("Food Type" = "Food",
                   "Gym Type" = "Gym",
                   "TV show" = "TV"))
  )   
)

body <- dashboardBody(
  fluidRow(
    tabBox(
      side = "right",
      selected = "Tab3",
      tabPanel("Tab1", "Tab content 1", textOutput("tabset1Selected")),
      tabPanel("Tab2", "Tab content 2", textOutput("tabset2Selected")),
      tabPanel("Tab3", "Tab content 3", textOutput("tabset3Selected"))
    )
  ),
)

shinyApp(
  ui = dashboardPage(
    dashboardHeader(title = "tabBoxes"),
    siderbar,
    body
  ),
  server = function(input, output) {
    # The currently selected tab from the first box
    output$tabset1Selected <- output$tabset2Selected <- output$tabset3Selected <- renderText({
      input$select_by
    })
  }
)