Register expressions for export in test mode

exportTestValues(..., quoted_ = FALSE, env_ = parent.frame(),
  session_ = getDefaultReactiveDomain())

Arguments

... Named arguments that are quoted or unquoted expressions that will be captured and evaluated when API endpoint is visited.
quoted_ Are the expression quoted? Default is FALSE.
env_ The environment in which the expression should be evaluated.
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 an API endpoint URL.

Details

This function only has an effect if the global option shiny.testmode is set to TRUE.

Examples

## Only run this example in interactive R sessions if (interactive()) { options(shiny.testmode = TRUE) # This application shows the test endpoint 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$getTestEndpointUrl(format="json") a(href = url, url) }) output$values <- renderText({ paste0("vals$x: ", vals$x, "\ny: ", y()) }) } ) }