shiny/man/makeReactiveBinding.Rd

% Generated by roxygen2 (4.0.0): do not edit by hand
\name{makeReactiveBinding}
\alias{makeReactiveBinding}
\title{Make a reactive variable}
\usage{
makeReactiveBinding(symbol, env = parent.frame())
}
\arguments{
\item{symbol}{A character string indicating the name of the variable that
should be made reactive}

\item{env}{The environment that will contain the reactive variable}
}
\value{
None.
}
\description{
Turns a normal variable into a reactive variable, that is, one that has
reactive semantics when assigned or read in the usual ways. The variable may
already exist; if so, its value will be used as the initial value of the
reactive variable (or \code{NULL} if the variable did not exist).
}
\examples{
\dontrun{
a <- 10
makeReactiveBinding("a")
b <- reactive(a * -1)
observe(print(b()))
a <- 20
}
}