Using shiny modules and shinydashboard: shiny.tag error

Question

I\'m trying to create and use shiny modules inside a shinydashboard app but I keep getting this error:

Error in FUN(X[[i]], ...) : Expected an object with cl         


        

Answer 1

Problem with shinydashboard and tagList

As described here

You need simple use

   ui <- dashboardPage(
  dashboardHeader(
    title = "Shiny modules and shinydashboard"
  ),

  dashboardSidebar(
    sidebarMenu(
      menuItem("PointA",tabName = "PointA") 
    )
  ),

  dashboardBody(
    tags$div( fooUI("myid"), class = "tab-content" )

)
)

Update

You also need tabName in menuItem

menuItem("PointA_",tabName = "PointA") 

Explanation

As you can see

tabItems
function (...) 
{
    lapply(list(...), tagAssert, class = "tab-pane")
    div(class = "tab-content", ...)
}
<environment: namespace:shinydashboard>

use list to ... and cant work if you already have list as arg.

So other variant it create new tabItems function like

tabItems1=function (...) 
    {
        lapply(..., tagAssert, class = "tab-pane")
        div(class = "tab-content", ...)
    }
environment(tabItems1)=environment(tabItems)

And then you can use tabItems1 with tagList

Answer 2

Following @Batanichek's answer which pointed me to the source of the problem (thanks for that) I simply removed the tagList() command in my fooUI definition. This conveniently solves the problem!

Answer 3

Two things:

1. Seems tabName is necessary in the menuItem function
2. Move tabItem from the module to ui (tabItem can hold you module)

UI

ui <- dashboardPage(
  dashboardHeader(
    title = "Shiny modules and shinydashboard"
  ),

  dashboardSidebar(
    sidebarMenu(
      menuItem("PointA", tabName = "PointA") 
    )
  ),

  dashboardBody(
    tabItems(
      tabItem("PointA",
              fooUI("myid")
      )
    )
  )
)

Module

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

  tagList(
    tabName = "PointA",
    textOutput(ns("text"))
  )
}

foo <- function(input, output, session){

  output$text <- renderText(
    rnorm(1)
  )
}