Shiny Dashboard - display a dedicated "loading.." page until initial loading of the data is done
Here's a very simple example using shinyjs
package
The idea is to create the loading "page" and the content "page" under different IDs, have the content page initially hidden, and use show()
and hide()
after the app is ready
library(shiny)library(shinyjs)load_data <- function() { Sys.sleep(2) hide("loading_page") show("main_content")}ui <- fluidPage( useShinyjs(), div( id = "loading_page", h1("Loading...") ), hidden( div( id = "main_content", "Data loaded, content goes here" ) ))server <- function(input, output, session) { load_data()}shinyApp(ui = ui, server = server)
In server
I like to use reactiveValues()
to store a setupComplete
condition. Then, when the data is loaded my setupComplete
is set to TRUE
.
In the ui
we can then assess this setupComplete
condition in a conditionalPanel
, and only display the content (in my example the three box()
widgets).
Here's a working example
## app.R ##library(shiny)library(shinydashboard)library(shinyjs)ui <- dashboardPage( dashboardHeader(), dashboardSidebar(), dashboardBody( actionButton(inputId = "btn_data", label = "Download"), conditionalPanel(condition = "output.setupComplete", box( title = "box1" ), box( title = "box2" ), box( title = "boc3" ) ), conditionalPanel(condition = "!output.setupComplete", box( title = "loading")) ))server <- function(input, output) { rv <- reactiveValues() rv$setupComplete <- FALSE ## simulate data load observe({ if(input$btn_data){ df <- data.frame(id = seq(1,200), val = rnorm(200, 0, 1)) ## Simulate the data load Sys.sleep(5) ## set my condition to TRUE rv$setupComplete <- TRUE } ## the conditional panel reads this output output$setupComplete <- reactive({ return(rv$setupComplete) }) outputOptions(output, 'setupComplete', suspendWhenHidden=FALSE) })}shinyApp(ui, server)
The code
hidden( div( id = "main_content", "Data loaded, content goes here" )
doesn't work with tabsetPanel. But if you move the id to the div level it works beautifully. Thanks to shinyjs author Dean Attali for this tip. https://stackoverflow.com/users/4432127/keshete
hidden( div(id = "mainTabsetPanel", tabsetPanel(....