Track server-side values — snap

Registers a reactiveValues object so that snap_take() captures its fields (all of them, or the ones named in fields) under name in the snapshot's values section, and so that a restore can write them back.

Usage

snap_track(
  values,
  fields = NULL,
  name = NULL,
  session = shiny::getDefaultReactiveDomain()
)

Arguments

values: A reactiveValues object.
fields: Names of the fields to capture, or NULL for all fields.
name: The name to store the values under. Defaults to the name of the variable passed as values.
session: The Shiny session. Defaults to the current session.

Value

The (namespaced) name the values are stored under, invisibly.

Details

Inside a module, name is namespaced automatically.

Examples

if (interactive()) {
  library(shiny)

  server <- function(input, output, session) {
    prefs <- reactiveValues(digits = 3L, scientific = FALSE)
    snap_track(prefs)
  }
}