gfile: File selection form

In jverzani/gWidgetsWWW2.rapache: Toolkit implementation of the gWidgets API for use with web pages

Description

This renders a file selection form within a small panel widget. There are two steps needed to transfer a file: a) select a file through a dialog, b) save the file to the server by clicking the upload button.

Usage

  gfile(text = "Choose a file", type = c("open"),
    filter = NULL, handler = NULL, action = NULL,
    container = NULL, ..., width = NULL, height = NULL,
    ext.args = NULL, fieldlabel = NULL,
    placeholder = gettext("Select a file..."),
    upload.message = gettext("Uploading your file ..."))

Arguments

text	Instructional text.
type	only "open" implemented
filter	ignored
handler	optional handler bound via addHandlerChanged
action	optional value to paramaterize handler
container	parent container
...	passed along to add call of the container. Can be used to adjust layout parameters. May also have other uses.
width	a pre-specified width (in pixels) for the widget
height	a pre-specified height (in pixels) for the widget
ext.args	A list of extra arguments to pass to the ExtJS constructor

Details

When a file is uploaded, any change handlers are called.

The svalue method gives the path of the uploaded file, the [ method gives the original name of the file when uploaded.

Value

a GFile instance

Note

the svalue method returns the temporary filename of the uploaded file, or a value of "". The [ method gives the original filename, once one is uploaded.

Examples

w <- gwindow()
gstatusbar("Powered by gWidgetsWWW2 and Rook", cont=w)
f <- gfile("Choose a file for upload", cont=w, handler=function(h,...) {
  galert(paste("You uploaded", svalue(h$obj)), parent=w)
})

jverzani/gWidgetsWWW2.rapache documentation built on May 20, 2019, 5:19 a.m.