downloadHandler
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. |
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.
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')
## ---------------------------------------------