shiny/_includes/tutorial/shiny-text.md

To run the example type:

> library(shiny)
> runExample("02_text")

ui.R

library(shiny)

# Define UI for dataset viewer application
shinyUI(pageWithSidebar(

  # Application title
  headerPanel("Shiny Text"),

  # Sidebar with controls to select a dataset and specify the number
  # of observations to view
  sidebarPanel(
    selectInput("dataset", "Choose a dataset:", 
                choices = c("rock", "pressure", "cars")),

    numericInput("obs", "Number of observations to view:", 10)
  ),

  # Show a summary of the dataset and an HTML table with the requested
  # number of observations
  mainPanel(
    verbatimTextOutput("summary"),

    tableOutput("view")
  )
))

server.R

library(shiny)
library(datasets)

# Define server logic required to summarize and view the selected dataset
shinyServer(function(input, output) {

  # Return the requested dataset
  datasetInput <- reactive(function() {
    switch(input$dataset,
           "rock" = rock,
           "pressure" = pressure,
           "cars" = cars)
  })

  # Generate a summary of the dataset
  output$summary <- reactivePrint(function() {
    dataset <- datasetInput()
    summary(dataset)
  })

  # Show the first "n" observations
  output$view <- reactiveTable(function() {
    obs <- as.integer(input$obs)
    head(datasetInput(), n = obs)
  })
})