#' Choose a File Interactively
#'
#' Display a file selection dialog
#'
#' @param default which folder to show initially (ignored on Windows)
#' @param caption the caption on the selection dialog (ignored on Windows)
#'
#' @details Uses an Apple Script/\link{choose.file} to display a file
#' selection dialog. With \code{default = NA}, the initial file selection is
#' determined by default behavior of the "choose file" system command.
#' Otherwise, paths are expanded with \link{path.expand}.
#'
#' @return A length one character vector, character NA if 'Cancel' was selected.
#' @export
choose.file = function(default = NA, caption = NA) {
if (Sys.info()['sysname'] == 'Darwin') {
command = 'osascript'
args = '-e "POSIX path of (choose file{{prompt}}{{default}})"'
if (!is.null(caption) && !is.na(caption) && nzchar(caption)) {
prompt = sprintf(' with prompt \\"%s\\"', caption)
} else {
prompt = ''
}
args = sub('{{prompt}}', prompt, args, fixed = T)
if (!is.null(default) && !is.na(default) && nzchar(default)) {
default = sprintf(' default location \\"%s\\"', path.expand(default))
} else {
default = ''
}
args = sub('{{default}}', default, args, fixed = T)
suppressWarnings({
path = system2(command, args = args, stderr = TRUE)
})
if (!is.null(attr(path, 'status')) && attr(path, 'status')) {
# user canceled
path = NA
}
# To resolve issue with FinderKit in High Sierra
path <- path[length(path)]
} else if (Sys.info()['sysname'] == 'Windows') {
path <- try(file.choose())
if (inherits(path, 'try-error')) {
path <- NA
}
} else {
path <- NA
}
return(path)
}
#' File Selection Control
#'
#' Create a file selection control to select a file on the server
#'
#' @param inputId The \code{input} slot that will be used to access the value
#' @param label Display label for the control, or NULL for no label
#' @param value Initial value. Paths are exapnded via
#' \code{\link{path.expand}}.
#'
#' @details This widget relies on \link{choose.file}/ to present an
#' interactive dialog to users for selecting a file on the local filesystem.
#' Therefore, this widget is intended for shiny apps that are run locally -
#' i.e. on the same system that files/directories are to be accessed - and not
#' from hosted applications (e.g. from shinyapps.io).
#'
#' @return A file input control that can be added to a UI definition.
#'
#' @seealso \link{updateFileSelectInput}, \link{readFileSelectInput},
#' \link{choose.file}, \link{choose.filename}
#' @export
fileSelectInput = function(inputId, label, value = NULL) {
if (!is.null(value) && !is.na(value)) {
value = path.expand(value)
}
shiny::tagList(
shiny::singleton(
shiny::tags$head(
shiny::tags$script(src = 'js/directory_input_binding.js')
)
),
shiny::div(
class = 'form-group directory-input-container',
shiny:::`%AND%`(label, shiny::tags$label(label)),
shiny::div(
shiny::span(
class = 'col-xs-9 col-md-11',
style = 'padding-left: 0; padding-right: 5px;',
shiny::div(
class = 'input-group shiny-input-container',
style = 'width:100%;',
shiny::div(class = 'input-group-addon', shiny::icon('file')),
shiny::tags$input(
id = sprintf('%s__chosen_dir', inputId),
value = value,
type = 'text',
class = 'form-control directory-input-chosen-dir',
readonly = 'readonly'
)
)
),
shiny::span(
class = 'shiny-input-container',
shiny::tags$button(
id = inputId,
class = 'btn btn-default directory-input',
'...'
)
)
)
)
)
}
#' Change the value of a fileSelectInput on the client
#'
#' @param session The \code{session} object passed to function given to
#' \code{shinyServer}.
#' @param inputId The id of the input object.
#' @param value A directory path to set
#' @param ... Additional arguments passed to \link{choose.file}. Only
#' used if \code{value} is \code{NULL}.
#'
#' @details Sends a message to the client, telling it to change the value of the
#' input object. For \code{fileSelectInput} objects, this changes the value
#' displayed in the text-field and triggers a client-side change event. A
#' directory selection dialog is not displayed.
#' @export
updateFileSelectInput = function(session, inputId, value = NULL, ...) {
if (is.null(value)) {
value = choose.file(...)
}
session$sendInputMessage(inputId, list(chosen_dir = value))
}
#' Read the value of a fileSelectInput
#'
#' @param session The \code{session} object passed to function given to
#' \code{shinyServer}.
#' @param inputId The id of the input object
#'
#' @details Reads the value of the text field associated with a
#' \code{fileSelectInput} object that stores the user selected directory path.
#' @export
readFileSelectInput = function(session, inputId) {
session$input[[sprintf('%s__chosen_dir', inputId)]]
}
#' Choose a File Name Interactively
#'
#' Display a file name selection dialog
#'
#' @param default which folder to show initially (ignored on Windows)
#' @param caption the caption on the selection dialog (ignored on Windows)
#'
#' @details Uses an Apple Script/\link{choose.filename} to display a file
#' selection dialog. With \code{default = NA}, the initial file selection is
#' determined by default behavior of the "choose file" system command.
#' Otherwise, paths are expanded with \link{path.expand}.
#'
#' @return A length one character vector, character NA if 'Cancel' was selected.
#' @export
choose.filename = function(default = NA, caption = NA) {
if (Sys.info()['sysname'] == 'Darwin') {
command = 'osascript'
args = '-e "POSIX path of (choose file name{{prompt}}{{default}})"'
if (!is.null(caption) && !is.na(caption) && nzchar(caption)) {
prompt = sprintf(' with prompt \\"%s\\"', caption)
} else {
prompt = ''
}
args = sub('{{prompt}}', prompt, args, fixed = T)
if (!is.null(default) && !is.na(default) && nzchar(default)) {
default = sprintf(' default location \\"%s\\"', path.expand(default))
} else {
default = ''
}
args = sub('{{default}}', default, args, fixed = T)
suppressWarnings({
path = system2(command, args = args, stderr = TRUE)
})
if (!is.null(attr(path, 'status')) && attr(path, 'status')) {
# user canceled
path = NA
}
path = path[length(path)]
# } else if (Sys.info()['sysname'] == 'Linux') {
# command = 'zenity'
# args = '--file-selection --directory --title="Choose a folder"'
#
# suppressWarnings({
# path = system2(command, args = args, stderr = TRUE)
# })
#
# #Return NA if user hits cancel
# if (!is.null(attr(path, 'status')) && attr(path, 'status')) {
# # user canceled
# return(default)
# }
#
# #Error: Gtk-Message: GtkDialog mapped without a transient parent
# if(length(path) == 2){
# path = path[2]
# }
# }
} else if (Sys.info()['sysname'] == 'Windows') {
path <- try(file.choose())
if (inherits(path, 'try-error')) {
path <- NA
}
} else {
path <- NA
}
return(path)
}
#' File Name Selection Control
#'
#' Create a file name selection control to select a file name on the server
#'
#' @param inputId The \code{input} slot that will be used to access the value
#' @param label Display label for the control, or NULL for no label
#' @param value Initial value. Paths are exapnded via
#' \code{\link{path.expand}}.
#'
#' @details This widget relies on \link{choose.filename}/ to present an
#' interactive dialog to users for selecting a file name on the local filesystem.
#' Therefore, this widget is intended for shiny apps that are run locally -
#' i.e. on the same system that files/directories are to be accessed - and not
#' from hosted applications (e.g. from shinyapps.io).
#'
#' @return A file name input control that can be added to a UI definition.
#'
#' @seealso \link{updateFileSelectInput}, \link{readFileSelectInput},
#' \link{choose.file}, \link{choose.filename}
#' @export
filenameSelectInput <- function(inputId, label, value = NULL) {
fileSelectInput(inputId, label, value)
}
#' Change the value of a filenameSelectInput on the client
#'
#' @param session The \code{session} object passed to function given to
#' \code{shinyServer}.
#' @param inputId The id of the input object.
#' @param value A directory path to set
#' @param ... Additional arguments passed to \link{choose.filename}. Only
#' used if \code{value} is \code{NULL}.
#'
#' @details Sends a message to the client, telling it to change the value of the
#' input object. For \code{filenameSelectInput} objects, this changes the value
#' displayed in the text-field and triggers a client-side change event. A
#' directory selection dialog is not displayed.
#' @export
updateFilenameSelectInput = function(session, inputId, value = NULL, ...) {
if (is.null(value)) {
value = choose.filename(...)
}
session$sendInputMessage(inputId, list(chosen_dir = value))
}
#' Read the value of a filenameSelectInput
#'
#' @param session The \code{session} object passed to function given to
#' \code{shinyServer}.
#' @param inputId The id of the input object
#'
#' @details Reads the value of the text field associated with a
#' \code{filenameSelectInput} object that stores the user selected file path.
#' @export
readFilenameSelectInput = function(session, inputId) {
session$input[[sprintf('%s__chosen_dir', inputId)]]
}
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.