shiny (version 1.4.0)

fileInput: File Upload Control

Description

Create a file upload control that can be used to upload one or more files.

Usage

fileInput(inputId, label, multiple = FALSE, accept = NULL,
  width = NULL, buttonLabel = "Browse...",
  placeholder = "No file selected")

Arguments

inputId

The input slot that will be used to access the value.

label

Display label for the control, or NULL for no label.

multiple

Whether the user should be allowed to select and upload multiple files at once. Does not work on older browsers, including Internet Explorer 9 and earlier.

accept

A character vector of MIME types; gives the browser a hint of what kind of files the server is expecting.

width

The width of the input, e.g. '400px', or '100%'; see validateCssUnit().

buttonLabel

The label used on the button. Can be text or an HTML tag object.

placeholder

The text to show before a file has been uploaded.

Server value

A data.frame that contains one row for each selected file, and following columns:

name

The filename provided by the web browser. This is not the path to read to get at the actual data that was uploaded (see datapath column).

size

The size of the uploaded data, in bytes.

type

The MIME type reported by the browser (for example, text/plain), or empty string if the browser didn't know.

datapath

The path to a temp file that contains the data that was uploaded. This file may be deleted if the user performs another upload operation.

Details

Whenever a file upload completes, the corresponding input variable is set to a dataframe. See the Server value section.

See Also

Other input elements: actionButton, checkboxGroupInput, checkboxInput, dateInput, dateRangeInput, numericInput, passwordInput, radioButtons, selectInput, sliderInput, submitButton, textAreaInput, textInput, varSelectInput

Examples

# NOT RUN {
## Only run examples in interactive R sessions
if (interactive()) {

ui <- fluidPage(
  sidebarLayout(
    sidebarPanel(
      fileInput("file1", "Choose CSV File",
        accept = c(
          "text/csv",
          "text/comma-separated-values,text/plain",
          ".csv")
        ),
      tags$hr(),
      checkboxInput("header", "Header", TRUE)
    ),
    mainPanel(
      tableOutput("contents")
    )
  )
)

server <- function(input, output) {
  output$contents <- renderTable({
    # input$file1 will be NULL initially. After the user selects
    # and uploads a file, it will be a data frame with 'name',
    # 'size', 'type', and 'datapath' columns. The 'datapath'
    # column will contain the local filenames where the data can
    # be found.
    inFile <- input$file1

    if (is.null(inFile))
      return(NULL)

    read.csv(inFile$datapath, header = input$header)
  })
}

shinyApp(ui, server)
}

# }