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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/crosstalk.R
\docType{data}
\name{SharedData}
\alias{SharedData}
\title{An R6 class that represents a shared data frame}
\format{An object of class \code{R6ClassGenerator} of length 24.}
\usage{
SharedData
}
\description{
...or sufficiently data frame-like object. The primary use for
\code{SharedData} is to be passed to Crosstalk-compatible widgets in place
of a data frame. Each \code{SharedData$new(...)} call makes a new "group"
of widgets that link to each other, but not to widgets in other groups.
You can also use a \code{SharedData} object from Shiny code in order to
react to filtering and brushing from non-widget visualizations (like ggplot2
plots).
}
\section{Constructor}{
\code{SharedData$new(data, key = NULL, group = createUniqueId(4, prefix = "SharedData"))}
\describe{
\item{\code{data}}{
A data frame-like object, or a Shiny \link[=reactive]{reactive
expression} that returns a data frame-like object.
}
\item{\code{key}}{
Character vector or one-sided formula that indicates the name of the
column that represents the key or ID of the data frame. These \emph{must}
be unique, and ideally will be something intrinsic to the data (a proper
ID) rather than a transient property like row index.
If \code{NULL}, then \code{row.names(data)} will be used.
}
\item{\code{group}}{
The "identity" of the Crosstalk group that widgets will join when you
pass them this \code{SharedData} object. In some cases, you will want to
have multiple independent \code{SharedData} objects link up to form a
single web of widgets that all share selection and filtering state; in
those cases, you'll give those \code{SharedData} objects the same group
name. (One example: in Shiny, ui.R and server.R might each need their own
\code{SharedData} instance, even though they're intended to represent a
single group.)
}
}
}
\section{Methods}{
\describe{
\item{\code{data(withSelection = FALSE, withFilter = TRUE, withKey = FALSE)}}{
Return the data (or read and return the data if the data is a Shiny
reactive expression). If \code{withSelection}, add a \code{selection_}
column with logical values indicating which rows are in the current
selection, or \code{NA} if no selection is currently active. If
\code{withFilter} (the default), only return rows that are part of the
current filter settings, if any. If \code{withKey}, add a \code{key_}
column with the key values of each row (normally not needed since the
key is either one of the other columns or else just the row names).
When running in Shiny, calling \code{data()} is a reactive operation
that will invalidate if the selection or filter change (assuming that
information was requested), or if the original data is a reactive
expression that has invalidated.
}
\item{\code{origData()}}{
Return the data frame that was used to create this \code{SharedData}
instance. If a reactive expression, evaluate the reactive expression.
Equivalent to \code{data(FALSE, FALSE, FALSE)}.
}
\item{\code{groupName()}}{
Returns the value of \code{group} that was used to create this instance.
}
\item{\code{key()}}{
Returns the vector of key values. Filtering is not applied.
}
\item{\code{selection(value, ownerId = "")}}{
If called without arguments, returns a logical vector of rows that are
currently selected (brushed), or \code{NULL} if no selection exists.
Intended to be called from a Shiny reactive context, and invalidates
whenever the selection changes.
If called with one or two arguments, expects \code{value} to be a logical
vector of \code{nrow(origData())} length, indicating which rows are
currently selected (brushed). This value is propagated to the web browser
(assumes an active Shiny app or Shiny R Markdown document).
Set the \code{ownerId} argument to the \code{outputId} of a widget if
conceptually that widget "initiated" the selection (prevents that widget
from clearing its visual selection box, which is normally cleared when
the selection changes). For example, if setting the selection based on a
\code{\link[shiny]{plotOutput}} brush, then \code{ownerId} should be the
\code{outputId} of the \code{plotOutput}.
}
\item{\code{clearSelection(ownerId = "")}}{
Clears the selection. For the meaning of \code{ownerId}, see the
\code{selection} method.
}
}
}
\keyword{datasets}
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