41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
import {Temporal} from 'temporal-polyfill';
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export function toAbsoluteLocaleDate(dateStr, lang, opts) {
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return Temporal.PlainDate.from(dateStr).toLocaleString(lang ?? [], opts);
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}
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window.customElements.define('absolute-date', class extends HTMLElement {
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static observedAttributes = ['date', 'year', 'month', 'weekday', 'day'];
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update = () => {
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const year = this.getAttribute('year') ?? '';
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const month = this.getAttribute('month') ?? '';
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const weekday = this.getAttribute('weekday') ?? '';
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const day = this.getAttribute('day') ?? '';
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const lang = this.closest('[lang]')?.getAttribute('lang') ||
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this.ownerDocument.documentElement.getAttribute('lang') || '';
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// only use the first 10 characters, e.g. the `yyyy-mm-dd` part
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const dateStr = this.getAttribute('date').substring(0, 10);
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if (!this.shadowRoot) this.attachShadow({mode: 'open'});
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this.shadowRoot.textContent = toAbsoluteLocaleDate(dateStr, lang, {
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...(year && {year}),
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...(month && {month}),
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...(weekday && {weekday}),
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...(day && {day}),
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});
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};
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attributeChangedCallback(_name, oldValue, newValue) {
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if (!this.initialized || oldValue === newValue) return;
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this.update();
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}
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connectedCallback() {
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this.initialized = false;
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this.update();
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this.initialized = true;
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}
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});
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