clientData |
A reactiveValues object that contains information about the client.
allowDataUriScheme is a logical value that indicates whether
the browser is able to handle URIs that use the data: scheme.
pixelratio reports the "device pixel ratio" from the web browser,
or 1 if none is reported. The value is 2 for Apple Retina displays.
singletons - for internal use
url_protocol , url_hostname , url_port ,
url_pathname , url_search , and url_hash_initial
can be used to get the components of the URL that was requested by the
browser to load the Shiny app page. These values are from the
browser's perspective, so neither HTTP proxies nor Shiny Server will
affect these values. The url_search value may be used with
parseQueryString to access query string parameters.
clientData also contains information about each output.
output_outputId_width and output_outputId_height
give the dimensions (using offsetWidth and offsetHeight ) of
the DOM element that is bound to outputId , and
output_outputId_hidden is a logical that indicates whether
the element is hidden. These values may be NULL if the output is
not bound.
|
input |
The session's input object (the same as is passed into the Shiny
server function as an argument).
|
isClosed() |
A function that returns TRUE if the client has
disconnected.
|
onEnded(callback) |
Synonym for onSessionEnded .
|
onFlush(func, once=TRUE) |
Registers a function to be called before the next time (if once=TRUE )
or every time (if once=FALSE ) Shiny flushes the reactive system.
Returns a function that can be called with no arguments to cancel the
registration.
|
onFlushed(func, once=TRUE) |
Registers a function to be called after the next time (if once=TRUE )
or every time (if once=FALSE ) Shiny flushes the reactive system.
Returns a function that can be called with no arguments to cancel the
registration.
|
onSessionEnded(callback) |
Registers a function to be called after the client has disconnected.
Returns a function that can be called with no arguments to cancel the
registration.
|
output |
The session's output object (the same as is passed into the Shiny
server function as an argument).
|
reactlog |
For internal use.
|
registerDataObj(name, data, filterFunc) |
Publishes any R object as a URL endpoint that is unique to this session.
name must be a single element character vector; it will be used
to form part of the URL. filterFunc must be a function that takes
two arguments: data (the value that was passed into
registerDataObj ) and req (an environment that implements
the Rook specification for HTTP requests). filterFunc will be
called with these values whenever an HTTP request is made to the URL
endpoint. The return value of filterFunc should be a Rook-style
response.
|
reload() |
The equivalent of hitting the browser's Reload button. Only works if the
session is actually connected.
|
request |
An environment that implements the Rook specification for HTTP requests.
This is the request that was used to initiate the websocket connection
(as opposed to the request that downloaded the web page for the app).
|
sendCustomMessage(type, message) |
Sends a custom message to the web page. type must be a
single-element character vector giving the type of message, while
message can be any jsonlite-encodable value. Custom messages
have no meaning to Shiny itself; they are used soley to convey information
to custom JavaScript logic in the browser. You can do this by adding
JavaScript code to the browser that calls
Shiny.addCustomMessageHandler(type, function(message){...})
as the page loads; the function you provide to
addCustomMessageHandler will be invoked each time
sendCustomMessage is called on the server.
|
sendInputMessage(inputId, message) |
Sends a message to an input on the session's client web page; if the input
is present and bound on the page at the time the message is received, then
the input binding object's receiveMessage(el, message) method will
be called. sendInputMessage should generally not be called directly
from Shiny apps, but through friendlier wrapper functions like
updateTextInput .
|
ns(id) |
Server-side version of ns <- NS(id) . If bare IDs need to be
explicitly namespaced for the current module, session$ns("name")
will return the fully-qualified ID.
|