Using shiny plotOutput in multiple places in R

Question

I am trying to use plotOutput in R shiny in multiple sub-menu items. However, I believe it is not possible for plotOutput to be used at multiple places with same id. Please help me if it is possible somehow. attaching the snapshot for reference.

library(shiny)
library(shinydashboard)
ui <- dashboardPage(
dashboardHeader(),
dashboardSidebar(
sidebarMenu(
id = "tabs",
  menuItem("Charts", icon = icon("bar-chart-o"),
           menuSubItem("Sub-item 1", tabName = "subitem1"),
           menuSubItem("Sub-item 2", tabName = "subitem2")
  ))),
dashboardBody(
tabItems(tabItem("subitem1", 3),
         tabItem("subitem2", plotOutput("brand_selector")))
 ))
server <- shinyServer(function(input, output) {
output$brand_selector <-  renderPlot({
plot(iris$Sepal.Length)
}) 
})
shinyApp(ui = ui, server = server)

Update

library(shiny)
library(shinydashboard)
submenuUI <- function(id) {
ns <- NS(id)
# return a list of tags
tagList(
column(2,offset = 0, style='padding:1px;', 

selectInput(ns("select1"),"select1",c("A1","A2","A3","A2","A1","A3","A1"))),
column(2,offset = 0, style='padding:1px;', 

selectInput(ns("select2"),"select2",c("B3","B4","B5","B3","B6","B2","B3")))
)
}
submenu <- function(input,output,session){}
ui <- dashboardPage(
dashboardHeader(), 
dashboardSidebar(
sidebarMenu(
id = "tabs",
  menuItem("Charts", icon = icon("bar-chart-o"),
           menuSubItem("Sub-item 1", tabName = "subitem1"),
           menuSubItem("Sub-item 2", tabName = "subitem2"),
           menuSubItem("Sub-item 3", tabName = "subitem3"),
           menuSubItem("Sub-item 4", tabName = "subitem4")
  ))),
 dashboardBody(
 tabItems(tabItem("subitem1", submenuUI('submenu1')),
         tabItem("subitem2", submenuUI('submenu2')),
         tabItem("subitem3", submenuUI('submenu3')),
         tabItem("subitem4", "Sub-item 2 tab content"))))
  server <- function(input, output, session) {
  observeEvent(input$Select1,{
  updateSelectInput(session,'Select2',
                  choices= input$select2[input$Select1 == "A1"] )
   }) 
   callModule(submenu, "submenu")
   }
   shinyApp(ui, server)

Please help me to update the second selectInput based on input from the previous selectInput.

Answer 1

This is the modularized code for multiple plotting: Very similar to the selectInput one.

library(shiny)
library(shinydashboard)

plotopUI <- function(id) {
  ns <- NS(id)


  # return a list of tags
  tagList(
   plotOutput(ns('plt'))
  )


}



plotop <- function(input,output,session){
  ns <- session$ns

  output$plt <- renderPlot({
    plot(iris$Sepal.Length)
  })
}


ui <- dashboardPage(
  dashboardHeader(), 
  dashboardSidebar(
    sidebarMenu(

      id = "tabs",
      menuItem("Charts", icon = icon("bar-chart-o"),
               menuSubItem("Sub-item 1", tabName = "subitem1"),
               menuSubItem("Sub-item 2", tabName = "subitem2")
      ))),
  dashboardBody(
    tabItems(tabItem("subitem1", plotopUI('plt1')),
             tabItem("subitem2", plotopUI('plt2')))))

server <- function(input, output, session) {
  callModule(plotop, "plt1")
  callModule(plotop, "plt2")
}
shinyApp(ui, server)