downloadHandler(filename, content, contentType = NA)


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.


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.


## 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') ## ---------------------------------------------