shiny/man/exportTestValues.Rd

% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/test-export.R
\name{exportTestValues}
\alias{exportTestValues}
\title{Register expressions for export in test mode}
\usage{
exportTestValues(
  ...,
  quoted_ = FALSE,
  env_ = parent.frame(),
  session_ = getDefaultReactiveDomain()
)
}
\arguments{
\item{...}{Named arguments that are quoted or unquoted expressions that will
be captured and evaluated when snapshot URL is visited.}

\item{quoted_}{Are the expression quoted? Default is \code{FALSE}.}

\item{env_}{The environment in which the expression should be evaluated.}

\item{session_}{A Shiny session object.}
}
\description{
This function registers expressions that will be evaluated when a test export
event occurs. These events are triggered by accessing a snapshot URL.
}
\details{
This function only has an effect if the app is launched in test mode. This is
done by calling \code{runApp()} with \code{test.mode=TRUE}, or by setting the
global option \code{shiny.testmode} to \code{TRUE}.
}
\examples{
## Only run this example in interactive R sessions
if (interactive()) {

options(shiny.testmode = TRUE)

# This application shows the test snapshot URL; clicking on it will
# fetch the input, output, and exported values in JSON format.
shinyApp(
  ui = basicPage(
    h4("Snapshot URL: "),
    uiOutput("url"),
    h4("Current values:"),
    verbatimTextOutput("values"),
    actionButton("inc", "Increment x")
  ),

  server = function(input, output, session) {
    vals <- reactiveValues(x = 1)
    y <- reactive({ vals$x + 1 })

    observeEvent(input$inc, {
      vals$x <<- vals$x + 1
    })

    exportTestValues(
      x = vals$x,
      y = y()
    )

    output$url <- renderUI({
      url <- session$getTestSnapshotUrl(format="json")
      a(href = url, url)
    })

    output$values <- renderText({
      paste0("vals$x: ", vals$x, "\ny: ", y())
    })
  }
)
}
}