Create server code to handle server-side creation of UI for dropzone items

This function will create the necessary event handlers that will call the UI function specified in the server argument of the dropZoneInput function.

dropZoneServer(session, dropZoneId, server)

Arguments

session	The session object passed to function given to shinyServer.
dropZoneId	The id of the first dropzone.
server	Function or function name as a string that will be used for server-side creation of UI for dropzone items. This is needed only when the dropzone items contain Shiny inputs and/or outputs.

Value

Expression including an observe event handler.