54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
// countdown timer for gacha enthusiasts
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// sample: bandori/wiki/BanG_Dream!_Wikia
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// sample: ensemble-stars/wiki/The_English_Ensemble_Stars_Wiki
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import {h, htm, render, signal, computed, effect} from "./preact.js"
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const html = htm.bind(h)
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const now = signal(Date.now())
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setInterval(() => now.value = Date.now(), 1000)
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const units = [
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["w", 7*24*60*60*1000],
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["d", 24*60*60*1000],
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["h", 60*60*1000],
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["m", 60*1000],
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["s", 1000]
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]
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function getDisplayTime(datetime, now, or) {
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let difference = datetime - now
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let foundSignificantField = false
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if (difference > 0) {
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return units.map(([letter, duration], index) => {
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const multiplier = Math.floor(difference / duration)
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difference -= multiplier * duration
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if (multiplier > 0 || foundSignificantField) {
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foundSignificantField = true
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return multiplier + letter
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}
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}).filter(s => s).join(" ")
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} else if (or) {
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return or
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} else {
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return `[timer ended on ${new Date(datetime).toLocaleString()}]`
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}
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}
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function Countdown(props) {
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return html`<span>${props.display}</span>`
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}
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document.querySelectorAll(".countdown").forEach(eCountdown => {
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// grab information and make variables
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const eDate = eCountdown.querySelector(".countdowndate")
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const eOr = eCountdown.nextElementSibling
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const or = eOr?.textContent
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const datetime = new Date(eDate.textContent).getTime()
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// the mapped signal
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const display = computed(() => getDisplayTime(datetime, now.value, or))
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// clear content and render
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while (eDate.childNodes[0] !== undefined) eDate.childNodes[0].remove()
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render(html`<${Countdown} display=${display} />`, eDate);
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})
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