A Pen by Geoff Graham on CodePen.
Created
December 2, 2021 14:48
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JS Countdown Timer
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<div id="app"></div> |
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// Credit: Mateusz Rybczonec | |
const FULL_DASH_ARRAY = 283; | |
const WARNING_THRESHOLD = 10; | |
const ALERT_THRESHOLD = 5; | |
const COLOR_CODES = { | |
info: { | |
color: "green" | |
}, | |
warning: { | |
color: "orange", | |
threshold: WARNING_THRESHOLD | |
}, | |
alert: { | |
color: "red", | |
threshold: ALERT_THRESHOLD | |
} | |
}; | |
const TIME_LIMIT = 20; | |
let timePassed = 0; | |
let timeLeft = TIME_LIMIT; | |
let timerInterval = null; | |
let remainingPathColor = COLOR_CODES.info.color; | |
document.getElementById("app").innerHTML = ` | |
<div class="base-timer"> | |
<svg class="base-timer__svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"> | |
<g class="base-timer__circle"> | |
<circle class="base-timer__path-elapsed" cx="50" cy="50" r="45"></circle> | |
<path | |
id="base-timer-path-remaining" | |
stroke-dasharray="283" | |
class="base-timer__path-remaining ${remainingPathColor}" | |
d=" | |
M 50, 50 | |
m -45, 0 | |
a 45,45 0 1,0 90,0 | |
a 45,45 0 1,0 -90,0 | |
" | |
></path> | |
</g> | |
</svg> | |
<span id="base-timer-label" class="base-timer__label">${formatTime( | |
timeLeft | |
)}</span> | |
</div> | |
`; | |
startTimer(); | |
function onTimesUp() { | |
clearInterval(timerInterval); | |
} | |
function startTimer() { | |
timerInterval = setInterval(() => { | |
timePassed = timePassed += 1; | |
timeLeft = TIME_LIMIT - timePassed; | |
document.getElementById("base-timer-label").innerHTML = formatTime( | |
timeLeft | |
); | |
setCircleDasharray(); | |
setRemainingPathColor(timeLeft); | |
if (timeLeft === 0) { | |
onTimesUp(); | |
} | |
}, 1000); | |
} | |
function formatTime(time) { | |
const minutes = Math.floor(time / 60); | |
let seconds = time % 60; | |
if (seconds < 10) { | |
seconds = `0${seconds}`; | |
} | |
return `${minutes}:${seconds}`; | |
} | |
function setRemainingPathColor(timeLeft) { | |
const { alert, warning, info } = COLOR_CODES; | |
if (timeLeft <= alert.threshold) { | |
document | |
.getElementById("base-timer-path-remaining") | |
.classList.remove(warning.color); | |
document | |
.getElementById("base-timer-path-remaining") | |
.classList.add(alert.color); | |
} else if (timeLeft <= warning.threshold) { | |
document | |
.getElementById("base-timer-path-remaining") | |
.classList.remove(info.color); | |
document | |
.getElementById("base-timer-path-remaining") | |
.classList.add(warning.color); | |
} | |
} | |
function calculateTimeFraction() { | |
const rawTimeFraction = timeLeft / TIME_LIMIT; | |
return rawTimeFraction - (1 / TIME_LIMIT) * (1 - rawTimeFraction); | |
} | |
function setCircleDasharray() { | |
const circleDasharray = `${( | |
calculateTimeFraction() * FULL_DASH_ARRAY | |
).toFixed(0)} 283`; | |
document | |
.getElementById("base-timer-path-remaining") | |
.setAttribute("stroke-dasharray", circleDasharray); | |
} |
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body { | |
font-family: sans-serif; | |
display: grid; | |
height: 100vh; | |
place-items: center; | |
} | |
.base-timer { | |
position: relative; | |
width: 300px; | |
height: 300px; | |
} | |
.base-timer__svg { | |
transform: scaleX(-1); | |
} | |
.base-timer__circle { | |
fill: none; | |
stroke: none; | |
} | |
.base-timer__path-elapsed { | |
stroke-width: 7px; | |
stroke: grey; | |
} | |
.base-timer__path-remaining { | |
stroke-width: 7px; | |
stroke-linecap: round; | |
transform: rotate(90deg); | |
transform-origin: center; | |
transition: 1s linear all; | |
fill-rule: nonzero; | |
stroke: currentColor; | |
} | |
.base-timer__path-remaining.green { | |
color: rgb(65, 184, 131); | |
} | |
.base-timer__path-remaining.orange { | |
color: orange; | |
} | |
.base-timer__path-remaining.red { | |
color: red; | |
} | |
.base-timer__label { | |
position: absolute; | |
width: 300px; | |
height: 300px; | |
top: 0; | |
display: flex; | |
align-items: center; | |
justify-content: center; | |
font-size: 48px; | |
} |
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