server.r

if (!require(quantmod)) {
  stop("This app requires the quantmod package. To install it, run 'install.packages(\"quantmod\")'.\n")
}

# Download data for a stock if needed, and return the data
require_symbol <- function(symbol, envir = parent.frame()) {
  if (is.null(envir[[symbol]])) {
    envir[[symbol]] <- getSymbols(symbol, auto.assign = FALSE)
  }

  envir[[symbol]]
}


shinyServer(function(input, output) {

  # Create an environment for storing data
  symbol_env <- new.env()

  # Make a chart for a symbol, with the settings from the inputs
  make_chart <- function(symbol) {
    symbol_data <- require_symbol(symbol, symbol_env)

    chartSeries(symbol_data,
                name      = symbol,
                type      = input$chart_type,
                subset    = paste("last", input$time_num, input$time_unit),
                log.scale = input$log_y,
                theme     = "white")
  }

  output$plot_aapl <- renderPlot({ make_chart("AAPL") })
  output$plot_msft <- renderPlot({ make_chart("MSFT") })
  output$plot_ibm  <- renderPlot({ make_chart("IBM")  })
  output$plot_goog <- renderPlot({ make_chart("GOOG") })
  output$plot_yhoo <- renderPlot({ make_chart("YHOO") })
})

ui.r

shinyUI(pageWithSidebar(
  headerPanel("Stocks"),

  sidebarPanel(
    wellPanel(
      p(strong("Stocks")),
      checkboxInput(inputId = "stock_aapl", label = "Apple (AAPL)",     value = TRUE),
      checkboxInput(inputId = "stock_msft", label = "Microsoft (MSFT)", value = FALSE),
      checkboxInput(inputId = "stock_ibm",  label = "IBM (IBM)",        value = FALSE),
      checkboxInput(inputId = "stock_goog", label = "Google (GOOG)",    value = TRUE),
      checkboxInput(inputId = "stock_yhoo", label = "Yahoo (YHOO)",     value = FALSE)
    ),

    selectInput(inputId = "chart_type",
                label = "Chart type",
                choices = c("Candlestick" = "candlesticks",
                            "Matchstick" = "matchsticks",
                            "Bar" = "bars",
                            "Line" = "line")
    ),

    wellPanel(
      p(strong("Date range (back from present)")),
      sliderInput(inputId = "time_num",
                  label = "Time number",
                  min = 1, max = 24, step = 1, value = 6),

      selectInput(inputId = "time_unit",
                  label = "Time unit",
                  choices = c("Days" = "days",
                              "Weeks" = "weeks",
                              "Months" = "months",
                              "Years" = "years"),
                  selected = "Months")
    ),

    checkboxInput(inputId = "log_y", label = "log y axis", value = FALSE)
  ),

  mainPanel(
    conditionalPanel(condition = "input.stock_aapl",
      br(),
      div(plotOutput(outputId = "plot_aapl"))),

    conditionalPanel(condition = "input.stock_msft",
      br(),
      div(plotOutput(outputId = "plot_msft"))),

    conditionalPanel(condition = "input.stock_ibm",
      br(),
      div(plotOutput(outputId = "plot_ibm"))),

    conditionalPanel(condition = "input.stock_goog",
      br(),
      div(plotOutput(outputId = "plot_goog"))),

    conditionalPanel(condition = "input.stock_yhoo",
      br(),
      plotOutput(outputId = "plot_yhoo"))
  )
))