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Creating a Countdown Timer with JavaScript

Tutorial October 24, 2024
php 

function initializeClock(id, endtime) {
    const clock = document.getElementById(id);
    const daysSpan = clock.querySelector('.days');
    const hoursSpan = clock.querySelector('.hours');
    const minutesSpan = clock.querySelector('.minutes');
    const secondsSpan = clock.querySelector('.seconds');

    function updateClock() {
        const t = getTimeRemaining(endtime);

        daysSpan.innerHTML = t.days;
        hoursSpan.innerHTML = ('0' + t.hours).slice(-2);
        minutesSpan.innerHTML = ('0' + t.minutes).slice(-2);
        secondsSpan.innerHTML = ('0' + t.seconds).slice(-2);

        if (t.total <= 0) {
            clearInterval(timeinterval);
        }
    }

    updateClock();
    const timeinterval = setInterval(updateClock, 1000);
}
  • initializeClock() takes two parameters: id (the ID of the HTML element where the timer will be displayed) and endtime (the deadline).
  • updateClock() retrieves the remaining time using the getTimeRemaining() function and updates the corresponding spans (days, hours, minutes, seconds).
  • setInterval() ensures that the updateClock() function runs every second (1000 milliseconds).
  • If the total remaining time becomes zero or negative, the interval is cleared, stopping the countdown.

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