Vector input in shiny R and then use it

Question

In Shiny R, I want a simple way to take a vector as user input in ui.R and then want to use that in a function in server.R.I am new in shiny, please help.

Answer 1

I am aware this is an old post but I have come across an alternative way for a user to enter a vector as Shiny input - using the create = TRUE and multiple = TRUE options with selectizeInput(). Slightly modifying Mike Wise's code example from above:

library(shiny)

ui <- shinyUI(

  pageWithSidebar(

    headerPanel("Entering Vectors in Shiny")

    , sidebarPanel(

      selectizeInput(
        "vec1"
        , "Enter a vector"
        , choices = NULL
        , multiple = TRUE
        , options = list(create = TRUE)
      )

    ),

    mainPanel(

      h4("You entered")

      , verbatimTextOutput("oid1")

      , verbatimTextOutput("oid2")

    )

  )
)

server <- shinyServer(function(input, output) {

  output$oid1 <- renderPrint({

    req(input$vec1)

    cat("As string:\n")
    cat(input$vec1)

  })

  output$oid2 <- renderPrint({

    req(input$vec1)

    cat("As atomic vector:\n")
    print(as.numeric(input$vec1))

  })

})

shinyApp(ui = ui, server = server)

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