Creating new countdown component.

src/components/atoms/Countdown/Countdown.css

@@ -0,0 +1,41 @@
+time {
+  display: flex;
+}
+
+.item {
+  padding: 0.25em 0.5em;
+}
+
+.number,
+.unit {
+  display: block;
+}
+
+.number.sm {
+  font-size: 1rem;
+}
+
+.number.md {
+  font-size: 2rem;
+}
+
+.number.lg {
+  font-size: 3rem;
+}
+
+.unit.sm {
+  font-size: 0.33rem;
+}
+
+.unit.md {
+  font-size: 0.66rem;
+}
+
+.unit.lg {
+  font-size: 1rem;
+}
+
+.unit,
+.number {
+  text-align: center;
+}

src/components/atoms/Countdown/Countdown.js

@@ -0,0 +1,165 @@
+import styles from '!!raw-loader!./Countdown.css';
+import varStyles from '!!raw-loader!../../../shared/variables.css';
+import bootstrapStyles from '!!raw-loader!../../../shared/themed-bootstrap.css';
+
+const template = document.createElement('template');
+
+template.innerHTML = `
+<time></time>
+`;
+
+export default class Countdown extends HTMLElement {
+  static get observedAttributes() {
+    return ['ends', 'size', 'text'];
+  }
+  constructor() {
+    // Always call super first in constructor
+    super();
+    // Create a shadow root
+    this.countdownInterval = this.initialiseClock.bind(this);
+    const shadow = this.attachShadow({ mode: 'open' });
+    shadow.appendChild(template.content.cloneNode(true));
+  }
+
+  connectedCallback() {
+    this.render();
+  }
+
+  attributeChangedCallback(attrName, oldValue, newValue) {
+    if (newValue !== oldValue) {
+      this[attrName] = newValue;
+      if (attrName !== 'ends') {
+        this.render();
+      }
+    }
+  }
+
+  render() {
+    const { ends } = this;
+    const bootStyles = document.createElement('style');
+    bootStyles.textContent = bootstrapStyles;
+    const variableStyles = document.createElement('style');
+    variableStyles.textContent = varStyles;
+    const badgeStyles = document.createElement('style');
+    badgeStyles.textContent = styles;
+    this.shadowRoot.appendChild(bootStyles);
+    this.shadowRoot.appendChild(variableStyles);
+    this.shadowRoot.appendChild(badgeStyles);
+
+    this.initialiseClock(ends);
+  }
+
+  get ends() {
+    return this.getAttribute('ends');
+  }
+
+  get size() {
+    return this.getAttribute('size');
+  }
+
+  get text() {
+    return this.getAttribute('text');
+  }
+
+  set ends(value) {
+    this.setAttribute('ends', value);
+    this.initialiseClock(value);
+  }
+
+  set size(value) {
+    this.setAttribute('size', value);
+  }
+
+  set text(value) {
+    this.setAttribute('text', value);
+  }
+
+  // Build a countdown unit
+  _createCountdownItem(key, value, size, text) {
+    const countdownItem = document.createElement('span');
+    countdownItem.className = 'item';
+    /* actual time left in days, hours, minutes or seconds */
+    const timeLeft = document.createElement('span');
+    timeLeft.className = `number ${key} ${size} text-${text}`;
+    timeLeft.textContent = value;
+    /* days, hours, minutes or seconds */
+    const unit = document.createElement('span');
+    unit.className = `unit ${size} text-${text}`;
+    unit.textContent = key;
+    countdownItem.appendChild(timeLeft);
+    countdownItem.appendChild(unit);
+    return countdownItem;
+  }
+
+  // Calcuate days, hours, minutes and seconds until endTime
+  _getTimeRemaining(endTime) {
+    const total = Date.parse(endTime) - Date.parse(new Date());
+    const seconds = Math.floor((total / 1000) % 60);
+    const minutes = Math.floor((total / 1000 / 60) % 60);
+    const hours = Math.floor((total / (1000 * 60 * 60)) % 24);
+    const days = Math.floor(total / (1000 * 60 * 60 * 24));
+    return {
+      total,
+      days,
+      hours,
+      minutes,
+      seconds,
+    };
+  }
+
+  // Setup and run the clock in the DOM
+  initialiseClock(endDate) {
+    const { shadowRoot, _createCountdownItem, _getTimeRemaining, size, text } =
+      this;
+    const timeRemaining = _getTimeRemaining(endDate);
+    const timeUnits = Object.keys(timeRemaining);
+    const clock = shadowRoot.querySelector('time');
+    let timeInterval;
+    clock.innerHTML = '';
+    timeUnits.forEach((timeUnit) => {
+      if (timeUnit !== 'total') {
+        clock.appendChild(
+          _createCountdownItem(timeUnit, timeRemaining[timeUnit], size, text),
+        );
+      }
+    });
+
+    function updateClock(ref) {
+      const endValue = ref.ends;
+      const updatedTimeRemaining = _getTimeRemaining(endValue);
+
+      const daysEl = shadowRoot.querySelector('.days');
+      const hoursEl = shadowRoot.querySelector('.hours');
+      const minutesEl = shadowRoot.querySelector('.minutes');
+      const secondsEl = shadowRoot.querySelector('.seconds');
+
+      daysEl.textContent = updatedTimeRemaining.days;
+      hoursEl.textContent = updatedTimeRemaining.hours;
+      minutesEl.textContent = updatedTimeRemaining.minutes;
+      secondsEl.textContent = updatedTimeRemaining.seconds;
+
+      /* Update the datetime attribute of the time element */
+      clock.setAttribute(
+        'datetime',
+        `P${updatedTimeRemaining.days}DT${updatedTimeRemaining.hours}H${updatedTimeRemaining.minutes}M${updatedTimeRemaining.seconds}S`,
+      );
+
+      if (updatedTimeRemaining.total <= 0) {
+        clearInterval(timeInterval);
+      }
+    }
+
+    function doesClockExist(ref) {
+      if (shadowRoot.querySelector('.days') === null) {
+        window.requestAnimationFrame(doesClockExist);
+      } else {
+        updateClock(ref);
+        timeInterval = setInterval(() => {
+          updateClock(ref);
+        }, 1000);
+      }
+    }
+
+    doesClockExist(this);
+  }
+}

src/components/atoms/Countdown/cod-countdown.js

@@ -0,0 +1,2 @@
+import Countdown from './Countdown';
+customElements.define('cod-countdown', Countdown);

src/index.js

@@ -17,6 +17,7 @@ import './components/atoms/CardOverlay/cod-card-overlay';
 import './components/atoms/CarouselCaption/cod-carousel-caption';
 import './components/atoms/CarouselItem/cod-carousel-item';
 import './components/atoms/Container/cod-container';
+import './components/atoms/Countdown/cod-countdown';
 import './components/atoms/DropdownMenu/cod-dropdown-menu';
 import './components/atoms/FormCheck/cod-formcheck';
 import './components/atoms/FormControl/cod-formcontrol';

src/stories/countdown.stories.js

@@ -0,0 +1,31 @@
+import '../components/atoms/Countdown/cod-countdown';
+import { COMMON_STORY_ARGS } from '../shared/js/storybook/args-utils';
+
+export default {
+  title: 'Components/Atoms/Countdown',
+  argTypes: {
+    size: {
+      control: { type: 'select' },
+      options: ['sm', 'md', 'lg'],
+    },
+    text: COMMON_STORY_ARGS.bootstrapColor,
+  },
+};
+// Template
+const Template = (args) => {
+  const countdown = document.createElement('cod-countdown');
+  countdown.setAttribute('data-extra-classes', args.extraClasses);
+  countdown.setAttribute('ends', args.end);
+  countdown.setAttribute('size', args.size);
+  countdown.setAttribute('text', args.text);
+
+  return countdown;
+};
+
+export const Countdown = Template.bind({});
+Countdown.args = {
+  extraClasses: '',
+  end: '2024-10-01T19:19',
+  size: 'sm',
+  text: 'dark',
+};