r - How to correct namespace for renderText in nested shiny modules? -


i cannot find way use output's variable in rendertext in nested ui module.

the problem came when tried grab name of tab , put in header title of navbarpage layout.

i not find fix issue in answers explaining how deal renderui(xxinput()) via session$ns like one. rendertext doesn't have id argument, don't know if apply anyway.

minimal example:

library(shiny)  header_module <- function(id, label="my header") {   ns <- ns(id)   headerpanel(     div(       h2("some text", shiny::br()),       #h2(textoutput("tab-name")),       h2(textoutput(ns("tab-name"))),       h2("some more static text")     )   ) }  ui <- function(id, label="main ui") {   ns <- ns(id)   navbarpage(title = "my app",               tabpanel(title = "my tab 1",                        pagewithsidebar(                         header_module(ns("header")),                         sidebarpanel(h2("sidebar")),                         mainpanel(h2("main panel"),                                   textoutput("tab-name"))),                       value = "tab1"),              id = ns("active-tab")) }  server <- function(input, output, session) {   output[["tab-name"]] <- rendertext({ input[["mainui-active-tab"]] })  }  shinyapp(ui=ui("mainui"),server=server)

enter image description here

the reference "active-tab" works in main panel, not in module-created header. if use textoutput(ns("tab-name")) (like above), empty div created <div id="mainui-header-tab-name" class="shiny-text-output shiny-bound-output"></div>. if use textoutput("tab-name"), main panel goes empty well.

it seems problem in code doesn't have modules. here fixed version:

library(shiny)  header_module <- function(id, label="my header") {   ns <- ns(id)   headerpanel(     div(       h2("some text", shiny::br()),       h2(textoutput("tab-name2")),       #h2(textoutput(ns("tab-name2"))),       h2("some more static text")     )   ) }  ui <- function(id, label="main ui") {   ns <- ns(id)   navbarpage(title = "my app",               tabpanel(title = "my tab 1",                        pagewithsidebar(                         header_module(ns("header")),                         sidebarpanel(h2("sidebar")),                         mainpanel(h2("main panel"),                                   textoutput("tab-name"))),                       value = "tab1"),              id = ns("active-tab")) }  server <- function(input, output, session) {   output[["tab-name"]] <- rendertext({ input[["mainui-active-tab"]] })   output[["tab-name2"]] <- rendertext({ input[["mainui-active-tab"]] })  }  shinyapp(ui=ui("mainui"),server=server)

the issue output-id tab-name appeared twice in ui not valid in html documents , therefore not valid in shiny. things more complicated of course if outputs defined within modules.

remark: avoid ids containing minus symbol tab-name, since - used seperator modules already. also, syntax output$tab-name throw errors object "name" not found.


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