39 lines
1.3 KiB
JavaScript
39 lines
1.3 KiB
JavaScript
export function toAbsoluteLocaleDate(date, lang, opts) {
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return new Date(date).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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initialized = false;
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update = () => {
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const opt = {};
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for (const attr of ['year', 'month', 'weekday', 'day']) {
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if (this.getAttribute(attr)) opt[attr] = this.getAttribute(attr);
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}
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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 date part, it is guaranteed to be in ISO format (YYYY-MM-DDTHH:mm:ss.sssZ)
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let date = this.getAttribute('date');
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let dateSep = date.indexOf('T');
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dateSep = dateSep === -1 ? date.indexOf(' ') : dateSep;
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date = dateSep === -1 ? date : date.substring(0, dateSep);
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if (!this.shadowRoot) this.attachShadow({mode: 'open'});
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this.shadowRoot.textContent = toAbsoluteLocaleDate(date, lang, opt);
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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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