Countdown timer

countdown-timer.markdown

Countdown timer

A Pen by Vasilii V on CodePen.

License.

index.html

<audio id="audio" src="http://www.soundjay.com/button/beep-07.wav" autoplay="false" ></audio>

<div class="timer">
    <div class="timer__controls">
      <button id='20sec' class="timer__button">20 Seconds</button>
      <button id="300sec" class="timer__button">5 Minutes</button>
      <button id="900sec" class="timer__button">15 Minutes</button>
      <button id="1200sec" class="timer__button">20 Minutes</button>
      <button id="3600sec" class="timer__button">1 Hour</button>
     
        <input type="text" id="custom" name="minutes" placeholder="Enter Minutes">
      <button class="timer__button" id='send'>Start timer</button>
    </div>
    <div id="display">
      <h1 id="display__time-left"></h1>
      <p id="display__end-time"></p>
    </div>
  </div>

script.js

const displayTime = document.getElementById('display__time-left');
const endTime = document.getElementById('display__end-time');
const sound = document.getElementById("audio");
let timermins, x, interval;



document.getElementById('20sec').addEventListener("click", () => {
  clearInterval(interval);
  time(20+2); 
})

document.getElementById('300sec').addEventListener("click", () => {
  clearInterval(interval);
  time(300+2); 
})

document.getElementById('900sec').addEventListener("click", () => {
  clearInterval(interval);
  time(900+2); 
})

document.getElementById('1200sec').addEventListener("click", () => {
  clearInterval(interval);
  time(1200+2); 
})

document.getElementById('3600sec').addEventListener("click", () => {
  clearInterval(interval);
  time(3600+2); 
})

document.getElementById('send').addEventListener("click", () => {
  clearInterval(interval);
  timermins = document.getElementById('custom').value;
  let minstosec = timermins* 60 + 2;
  time(minstosec);
  return false;
});


const time = sec => {
  const now = Date.now();
  const then = now +sec*1000;
  displayEndTime(then);
  interval = setInterval(() => {
  const timeLeft = (Math.floor(then-Date.now())) / 1000;
    if (timeLeft<1) {
   
 sound.play();   clearInterval(interval);
      
    }
    displayTimeLeft(timeLeft);
  }, 1000)
};

const displayTimeLeft = sec => {
  const mins = Math.floor(sec / 60);
  const remsec = Math.floor(sec % 60);
  let toDisplay = `${mins}:${remsec<10 ? '0' + remsec : remsec}`;
  displayTime.textContent = toDisplay;
  //console.log(toDisplay);
  //console.log(sec);
};

const displayEndTime = timestamp => {
  const end = new Date(timestamp);
  
  const hour = end.getHours();
  //console.log(hour);
  const min = end.getMinutes();
  endTime.textContent = `The timer will stop at ${hour}:${min< 10 ? '0' + min : min}`
  }
//console.log(timermins)
x = timermins ? timermins*60 : 2;
time(x);

style.css

html {
  box-sizing: border-box;
  font-size: 10px;
  background: #8E24AA;
  background: linear-gradient(45deg,  #42a5f5 0%,#478ed1 50%,#0d47a1 100%);
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  margin: 0;
  text-align: center;
  font-family: 'Inconsolata', monospace;
}

#display__time-left {
  font-weight: 100;
  font-size: 20rem;
  margin: 0;
  color: white;
  text-shadow: 4px 4px 0 rgba(0,0,0,0.05);
}

.timer {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

.timer__controls {
  display: flex;
}

.timer__controls > * {
  flex: 1;
}

.timer__controls form {
  flex: 1;
  display: flex;
}

.timer__controls input {
  flex: 1;
  border: 0;
  padding: 2rem;
}

.timer__button {
  background: none;
  border: 0;
  cursor: pointer;
  color: white;
  font-size: 2rem;
  text-transform: uppercase;
  background: rgba(0,0,0,0.1);
  border-bottom: 3px solid rgba(0,0,0,0.2);
  border-right: 1px solid rgba(0,0,0,0.2);
  padding: 1rem;
  font-family: 'Inconsolata', monospace;
}

.timer__button:hover,
.timer__button:focus {
  background: rgba(0,0,0,0.2);
  outline: 0;
}

#display {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#display__end-time {
  font-size: 4rem;
  color: white;
}