downloadHandler

0th

Percentile

File Downloads

Allows content from the Shiny application to be made available to the user as file downloads (for example, downloading the currently visible data as a CSV file). Both filename and contents can be calculated dynamically at the time the user initiates the download. Assign the return value to a slot on output in your server function, and in the UI use downloadButton or downloadLink to make the download available.

Usage
downloadHandler(filename, content, contentType = NA,
  outputArgs = list())
Arguments
filename

A string of the filename, including extension, that the user's web browser should default to when downloading the file; or a function that returns such a string. (Reactive values and functions may be used from this function.)

content

A function that takes a single argument file that is a file path (string) of a nonexistent temp file, and writes the content to that file path. (Reactive values and functions may be used from this function.)

contentType

A string of the download's content type, for example "text/csv" or "image/png". If NULL or NA, the content type will be guessed based on the filename extension, or application/octet-stream if the extension is unknown.

outputArgs

A list of arguments to be passed through to the implicit call to downloadButton when downloadHandler is used in an interactive R Markdown document.

Aliases
  • downloadHandler
Examples
# NOT RUN {
## Only run examples in interactive R sessions
if (interactive()) {

ui <- fluidPage(
  downloadLink("downloadData", "Download")
)

server <- function(input, output) {
  # Our dataset
  data <- mtcars

  output$downloadData <- downloadHandler(
    filename = function() {
      paste("data-", Sys.Date(), ".csv", sep="")
    },
    content = function(file) {
      write.csv(data, file)
    }
  )
}

shinyApp(ui, server)
}
# }
Documentation reproduced from package shiny, version 1.3.2, License: GPL-3 | file LICENSE

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