Hi,
This is a sample code that illustrates what are you looking for:
PennController.ResetPrefix(null) // Keep here
newTrial(
newVar("finishTime").set(v=>Date.now())
,
newText("countDown", "0m0s").print()
,
newTimer("updateCountdown",1000).callback(
newVar("difference")
.set(getVar("finishTime")).set(v=>-v+Date.now())
,
// Transform the Var element into an appropriately formatted string
getVar("difference")
.set(v=>Math.trunc(v/60000)+"m"+Math.round((v/1000)%60)+"s")
,
getText("countDown").text(getVar("difference"))
,
// Relaunch the timer to update again in 1s
getTimer("updateCountdown").start()
).start() // Don't forget to start the timer the initially
,
newButton("Click me").print().wait()
,
getVar("finishTime").set(v=>Date.now()) // This will effectively stop the countdown
,
getTimer("updateCountdown").test.running()
.success( newText("You clicked in time!").print() )
.failure( newText("You were too late").print() )
,
newButton("Finish").print().wait()
)Hope it helps!