R shiny mapping output to input

Question

I'm building my first shiny app and I've run into a little difficulty which i cant understand

My code wants to take the input from the user - add one then print the output please ignore the radio buttons for now -

    ui <- shinyUI(fluidPage(

  titlePanel("alpha"),

    sidebarPanel(numericInput("expn", 
                              "Please enter total number of reports received", 1,
                              min = 0,
                              max = 1000000
    ),
     radioButtons(inputId = "'QC_Type'", label = "QC Type", 
                 choices = c("Overall", "Solicited", "Spontaneous", 
                             "Clinical Trial","Literature" ),


    mainPanel(
      textOutput("results"))

    ))))





  server <- function (input, output) {
    output$results <- renderText(
    { print(1 +(Input$expn))
  }
  )
}

shinyApp(ui = ui, server = server)

I'm unable to see any output when I run the code.

Thank you for your time :)

Edgar · Accepted Answer · 2018-05-14 13:45:27Z

That's because of where your mainPanelis located. It should follow the sidebarPanel. Also, I recommend using as.character() instead of print(), unless you really want to print out the output on the console.

Here's the corrected code:

ui <- shinyUI(fluidPage(
  titlePanel("alpha"),

  sidebarPanel(
    numericInput(
      "expn",
      "Please enter total number of reports received",
      1,
      min = 0,
      max = 1000000
    ),
    radioButtons(
      inputId = "'QC_Type'",
      label = "QC Type",
      choices = c(
        "Overall",
        "Solicited",
        "Spontaneous",
        "Clinical Trial",
        "Literature"
      )
    )
  ),
  mainPanel(textOutput("results"))
))

server <- function (input, output) {
  output$results <- renderText({
    as.character(1 + (input$expn))
  })
}

shinyApp(ui = ui, server = server)

I recommend using good practices when indenting code. It makes things easier to read and to find where braces and parentheses are.

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