r - conditionalPanel in Shiny not working -

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i trying use conditionalpanel display message when file being loaded. however, panel not disappearing once condition true. have created reproducible code below:

server.r

library(shiny)  print("loading start") print(paste("1->",exists('fgram'))) fgram <- readrds("data/ugram.rds") print(paste("2->",exists('fgram'))) print("loading end")  shinyserver( function(input, output, session) {  })

ui.r

library(shiny)  shinyui( fluidpage(   sidebarlayout(     sidebarpanel(       h4("side panel")       )     ),      mainpanel(       h4("main panel"),       br(),       textoutput("first line of text.."),       br(),       conditionalpanel(condition = "exists('fgram')", html("please wait!!     <br>app loading, may take while....")),       br(),       h4("last line of text..")     )   ) )

conditions supplied conditionalpanel executed in javascript environment, not r environment, , therefore cannot reference or inspect variables or functions in r environment. solution situation use uioutput, in example below.

myglobalvar <- 1  server <- function(input, output) {      output$condpanel <- renderui({         if (exists('myglobalvar'))              html("please wait!!     <br>app loading, may take while....")     })  }  ui <- fluidpage({     uioutput('condpanel') })   shinyapp(ui=ui, server=server)

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