Question

I have a timer that counts down every second. The timer is used for a game: the user has up to 15 seconds
to answer to a question. Let’s say the game has 10 questions. The timer works great for the first question
, but then, speeds up more and more with every question. Any suggestion is more then welcome. Thank you!

Code is here:

var timeInSecs;
var ticker;
function startTimer(secs) {
    timeInSecs = secs;
    ticker = setInterval("tick()", 1000); // every second
}
function tick() {
    var seconds = timeInSecs;
    if (seconds > 0) {
        timeInSecs--;
    }
    else if (seconds == 0) {
        document.getElementById("timeExpired").innerHTML = "Time expired!";
    }
    document.getElementById("countDown").innerHTML = seconds;
}
function myStopFunction() {
    clearInterval(ticker);
}​

Answer 1

else if(seconds==0)
        {
            // you should stop the timer here, and clear the interval
            myStopFunction();
            document.getElementById("timeExpired").innerHTML = "Time expired!";
        }

Edit: A side note

It is better to pass the function tick to the interval, rather than a string to evaluate. Using eval is generally a dangerous thing to do, and less efficient.

setInterval(tick, 1000)

Edit: Another side note

You can write the tick function a lot less verbosely (and without the extra variable seconds)

    function tick(){
        document.getElementById("countDown").innerHTML = timeInSecs;
        if(! timeInSecs--){
            myStopFunction()                
            document.getElementById("timeExpired").innerHTML = "Time expired!";
        }
    }