Nothing
library(shiny)
library(R6)
library(later)
HelloWorldDemo = R6Class("HelloWorldDemo",
public = list( testResult=NULL,
initialize = function(){
message(sprintf("initializing HelloWorldDemo"))
},
ui = function(){
fluidPage(
actionButton(inputId="sayHelloButton", label="Say Hello"),
textOutput("textDisplay")
)},
server = function(input, output, session) {
helloTest <- function(){
later(function(){
public$testResult <- FALSE # be pessimistic
message(sprintf("--- executing helloTest's later function"))
public$testResult <-checkEquals(public$textDisplay)
message(sprintf("test result: %s", public$testResult))
output$textDisplay <- renderText({public$testResult});
}, 1)
}
observeEvent(input$sayHelloButton,{
output$textDisplay = renderText("Hello world!")
})
if(!interactive()){
helloTest()
stopifnot(public$testResult == TRUE)
quit()
} #interactive
} # server
) # public
) # class
x <- HelloWorldDemo$new()
runApp(shinyApp(x$ui, x$server), port=9999, launch.browser=TRUE)
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