shiny (version 0.13.2)

downloadHandler: File Downloads

Description

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)

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.

Examples

## Not run: 
# # In server.R:
# output$downloadData <- downloadHandler(
#   filename = function() {
#     paste('data-', Sys.Date(), '.csv', sep='')
#   },
#   content = function(file) {
#     write.csv(data, file)
#   }
# )
# 
# # In ui.R:
# downloadLink('downloadData', 'Download')
# ## End(Not run)