[JScore-JS-Advanced-Exercises] - 03. Timer

function timer() {
    let sec = 0;
    let timer;
    let startBtn = $('#start-timer');
    let stopBtn = $('#stop-timer');
    stopBtn.attr("disabled", true);

    startBtn.on("click", function (event) {
        startBtn.attr("disabled", true);
        stopBtn.attr("disabled", false);
        timer = setInterval(step, 1000);
        //alert("START");
    });

    stopBtn.on("click", function (event) {
        stopBtn.attr("disabled", true);
        startBtn.attr("disabled", false);
        clearInterval(timer);
        //alert("STOP");
    });

    function step() {
        sec++;
        let digSec = sec % 60;
        let digMin = parseInt((sec/60)%60);
        let digHour = parseInt(sec/3600);

        if (digSec < 10 ){
            digSec = '0' + digSec.toString();
        }
        if (digMin < 10 ){
            digMin = '0' + digMin.toString();
        }
        if (digHour < 10 ){
            digHour = '0' + digHour.toString();
        }

        $('#seconds').text(digSec);
        $('#minutes').text(digMin);
        $('#hours').text(digHour);

    }
}