Create input ui elements for shiny app from existing data

shiny
#1

Hello,

Say I have an existing data frame, and I want to create a succession of radioButton inputs to replicate this data, how do I / can I do this without copying and pasting and changing [1] to [2] and so on?

See below for a reprex to demonstrate how I am currently doing it - is there a better way to create multiple input elements from a dataframe/vector/list?

library(shiny)
library(tidyverse)

choices <- c("Yes", "No", "Maybe")

df <- tibble(car = rownames(mtcars),
             choices = sample(choices, 32, T))
    
ui <- fluidPage(

    radioButtons(df$car[1], label = h5(df$car[1]),
                 choices = choices, 
                 selected = df$choices[1], inline = T),
    radioButtons(df$car[2], label = h5(df$car[2]),
                 choices = choices, 
                 selected = df$choices[2], inline = T),
    radioButtons(df$car[3], label = h5(df$car[3]),
                 choices = choices, 
                 selected = df$choices[3], inline = T),
    
)

server <- function(input, output) {

    output$value <- renderPrint({ input$radio })
}

# Run the application 
shinyApp(ui = ui, server = server)
#2

Thanks for asking an interesting question :slight_smile:

library(shiny)
library(tidyverse)
library(purrr)
choices <- c("Yes", "No", "Maybe")

df <- tibble(
  car = rownames(mtcars),
  choices = sample(choices, 32, T),
  inames = tolower(gsub(" ", "", rownames(mtcars)))
)

ui <- fluidPage(
  sidebarLayout(
    sidebarPanel(uiOutput("radioholder")),
    mainPanel(
      textOutput("value"),
      tags$style(type = "text/css", "#value {white-space: pre-wrap;}")
    ) ## to respect \n linebreaks
  )
)

server <- function(input, output) {
  output$radioholder <- renderUI({
    map(df$inames, ~ {
      radioButtons(.,
        label = h5(.),
        choices = choices,
        selected = choices[1], inline = T
      )
    })
  })
  output$value <- renderText({
    printfunc <- function(x) {
      paste0(
        "radio ",
        x,
        " is set to ",
        input[[x]]
      )
    }

    paste0(map(df$inames, printfunc), collapse = "\n")
  })
}

# Run the application
shinyApp(ui = ui, server = server)
1 Like
#3

Thank you, this is very helpful!

However, to get the full way there (and have the choices column of the data frame be reflected in the selection for each radioButton, I took your example a set further using map2, and you could use pmap and so on:

library(shiny)
library(tidyverse)
library(purrr)
choices <- c("Yes", "No", "Maybe")

df <- tibble(
  car = rownames(mtcars),
  choices = sample(choices, 32, T),
  inames = tolower(gsub(" ", "", rownames(mtcars)))
)

ui <- fluidPage(
  sidebarLayout(
    sidebarPanel(uiOutput("radioholder")),
    mainPanel(
      textOutput("value"),
      tags$style(type = "text/css", "#value {white-space: pre-wrap;}")
    ) ## to respect \n linebreaks
  )
)

server <- function(input, output) {
  output$radioholder <- renderUI({
    map2(df$car, df$choices, ~ {
      radioButtons(.x,
                   label = h5(.x),
                   choices = choices,
                   selected = .y, inline = T
      )
    })
  })
  output$value <- renderText({
    printfunc <- function(x) {
      paste0(
        "radio ",
        x,
        " is set to ",
        input[[x]]
      )
    }
    
    paste0(map(df$inames, printfunc), collapse = "\n")
  })
}

# Run the application
shinyApp(ui = ui, server = server)
#4

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