Countdown timer with SVG circle

countdown-timer-with-svg-circle.markdown

Countdown timer with SVG circle

I used stroke-dasharray and stroke-dashoffset in a circle svg element. Setting stroke-dasharray to a full circle (e.g. 113px) and animating the stroke-dashoffset from 0px to 113px makes the circle's stroke disappear gradually.

A Pen by ไน้ท์นี on CodePen.

License.

index.html

<div id="countdown">
  <div id="countdown-number"></div>
  <svg>
    <circle r="18" cx="20" cy="20"></circle>
  </svg>
</div>

script.js

var countdownNumberEl = document.getElementById('countdown-number');
var countdown = 1340;

countdownNumberEl.textContent = countdown;

setInterval(function() {
  countdown = --countdown <= 0 ? 10 : countdown;

  countdownNumberEl.textContent = countdown;
}, 12500);

style.css

body {
  height: 100%;
  width: 100%;
  background-color: #333;
}

#countdown {
  position: relative;
  margin: auto;
  margin-top: 100px;
  height: 40px;
  width: 40px;
  text-align: center;
}

#countdown-number {
  color: white;
  display: inline-block;
  line-height: 40px;
}

svg {
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  transform: rotateY(-180deg) rotateZ(-90deg);
}

svg circle {
  stroke-dasharray: 113px;
  stroke-dashoffset: 0px;
  stroke-linecap: round;
  stroke-width: 2px;
  stroke: white;
  fill: none;
  animation: countdown 10s linear infinite forwards;
}

@keyframes countdown {
  from {
    stroke-dashoffset: 0px;
  }
  to {
    stroke-dashoffset: 113px;
  }
}