How to wrap up sliderInput inside hidden function in Rshiny-CodePudding

I want the user of the App to be able to change the width and height of the graphs.
However, I want the slider bars to appear only after the graph is being plot.

For this I created a hidden function, and then I call the function with an observeEvent. However, this doesn't change the display of the app, as the sliders are there before calling for the plot.

 # Shiny
library(shiny)
library(shinyWidgets)
library(shinyjqui)

# Data
library(readxl)
library(dplyr)

# Plots
library(ggplot2)


# Create functions

not_sel <- "Not Selected"

# main page display in the shiny app where user will input variables and plots will be displayed
main_page <- tabPanel(
  title = "Plotter",
  titlePanel("Plotter"),
  sidebarLayout(
    sidebarPanel(
      title = "Inputs",
      fileInput("xlsx_input", "Select XLSX file to import", accept = c(".xlsx")),
      selectInput("num_var_1", "Variable X axis", choices = c(not_sel)),
      selectInput("num_var_2", "Variable Y axis", choices = c(not_sel)),
      uiOutput("factor"),
      br(),
      actionButton("run_button", "Run Analysis", icon = icon("play"))
    ),
    mainPanel(
      tabsetPanel(
        tabPanel(
          title = "Plot",
          br(),
          plotOutput("plot_1"),
          br(),
          hidden(
            p(id = "sliders",
              sliderInput("height", "Height", min = 350, max = 520, value = 405),
              sliderInput("width", "Width", min = 350, max = 800, value = 500))
          #sliderInput("height", "Height", min = 350, max = 520, value = 405),
          #sliderInput("width", "Width", min = 350, max = 800, value = 500),
          )
        )
      )
    )
  )
)

# Function for printing the plots
draw_boxplot <- function(data_input, num_var_1, num_var_2)
  ggplot(data = data_input, aes(x = .data[[num_var_1]], y = .data[[num_var_2]]))  
  geom_boxplot()   
  theme_bw()

################# --------------------------------------------------------------
# User interface
################# --------------------------------------------------------------

ui <- navbarPage(
  main_page
)

################# --------------------------------------------------------------
# Server
################# --------------------------------------------------------------
server <- function(input, output){
  
  # Dynamic selection of the data 
  data_input <- reactive({
    #req(input$xlsx_input)
    #inFile <- input$xlsx_input
    #read_excel(inFile$datapath, 1)
    iris
  })
  
  # We update the choices available for each of the variables
  observeEvent(data_input(),{
    choices <- c(not_sel, names(data_input()))
    updateSelectInput(inputId = "num_var_1", choices = choices)
    updateSelectInput(inputId = "num_var_2", choices = choices)
  })
  
  num_var_1 <- eventReactive(input$run_button, input$num_var_1)
  num_var_2 <- eventReactive(input$run_button, input$num_var_2)
  
  observeEvent(input$run_button, {
    show("sliders")
  })
  
  ## BoxPlot -------------------------------------------------------------------
  plot_1 <- eventReactive(input$run_button,{
    req(data_input())
    draw_boxplot(data_input(), num_var_1(), num_var_2())
  })
  
  
  output$plot_1 <- renderPlot(
    width = function() input$width,
    height = function() input$height,
    res = 96,
    {
      plot_1()
    }
  )

  
}

# Connection for the shinyApp
shinyApp(ui = ui, server = server)

CodePudding user response：

Using shinyjs::hidden(), change p() to div() (because p elements can't contain div elements).

I used iris.xlsx as dummy data.

shinyjs::hidden(
  div(id = "sliders",
      sliderInput("height", "Height", min = 350, max = 520, value = 405),
      sliderInput("width", "Width", min = 350, max = 800, value = 500))
)

app:

# Shiny
library(shiny)
library(shinyWidgets)
library(shinyjqui)
library(shinyjs)

# Data
library(readxl)
library(dplyr)

# Plots
library(ggplot2)


# Create functions

# create some data
writexl::write_xlsx(iris, "iris.xlsx")

not_sel <- "Not Selected"

# main page display in the shiny app where user will input variables and plots will be displayed
main_page <- tabPanel(
  useShinyjs(),
  title = "Plotter",
  titlePanel("Plotter"),
  sidebarLayout(
    sidebarPanel(
      title = "Inputs",
      fileInput("xlsx_input", "Select XLSX file to import", accept = c(".xlsx")),
      selectInput("num_var_1", "Variable X axis", choices = c(not_sel)),
      selectInput("num_var_2", "Variable Y axis", choices = c(not_sel)),
      uiOutput("factor"),
      br(),
      actionButton("run_button", "Run Analysis", icon = icon("play"))
    ),
    mainPanel(
      tabsetPanel(
        tabPanel(
          title = "Plot",
          br(),
          plotOutput("plot_1"),
          br(),
          shinyjs::hidden(
            div(
              id = "sliders",
              sliderInput("height", "Height", min = 350, max = 520, value = 405),
              sliderInput("width", "Width", min = 350, max = 800, value = 500)
            )
          )
        )
      )
    )
  )
)

# Function for printing the plots
draw_boxplot <- function(data_input, num_var_1, num_var_2) {
  ggplot(data = data_input, aes(x = .data[[num_var_1]], y = .data[[num_var_2]]))  
    geom_boxplot()  
    theme_bw()
}

################# --------------------------------------------------------------
# User interface
################# --------------------------------------------------------------

ui <- navbarPage(
  main_page
)

################# --------------------------------------------------------------
# Server
################# --------------------------------------------------------------
server <- function(input, output) {

  # Dynamic selection of the data
  data_input <- reactive({
    # req(input$xlsx_input)
    # inFile <- input$xlsx_input
    # read_excel(inFile$datapath, 1)
    iris
  })

  # We update the choices available for each of the variables
  observeEvent(data_input(), {
    choices <- c(not_sel, names(data_input()))
    updateSelectInput(inputId = "num_var_1", choices = choices)
    updateSelectInput(inputId = "num_var_2", choices = choices)
  })

  num_var_1 <- eventReactive(input$run_button, input$num_var_1)
  num_var_2 <- eventReactive(input$run_button, input$num_var_2)

  observeEvent(input$run_button, {
    shinyjs::show("sliders")
  })

  ## BoxPlot -------------------------------------------------------------------
  plot_1 <- eventReactive(input$run_button, {
    req(data_input())
    draw_boxplot(data_input(), num_var_1(), num_var_2())
  })


  output$plot_1 <- renderPlot(
    width = function() input$width,
    height = function() input$height,
    res = 96,
    {
      plot_1()
    }
  )
}

# Connection for the shinyApp
shinyApp(ui = ui, server = server)