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HTML

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Insecure Resource

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CSS

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="contet">
  <div class="inner">
    <a class="ticker js-ticker" href="https://tone-design.net/" target="_blank">
      <span class="ticker__text js-ticker-text">自動無限ループで一定方向にスクロールするコンテンツの実装のメモ</span>
    </a>
  </div>
</div>
!

CSS 

              
                :root {
  --black: #1b1b1b;
  --white: #fff;
  --yellow: #ffd500;
}

body {
  background-color: var(--black);
  font-family: arial, sans-serif;
}

.contet {
  display: grid;
  place-items: center;
  height: 100vh;
}
.contet .ticker {
  margin: 20px 0;
}
.contet .ticker:nth-child(3) {
  width: 400px;
}

.ticker {
  position: relative;
  display: block;
  width: 300px;
  max-width: 100vw;
  height: 60px;
  background-color: #ffd500;
  border-radius: 30px;
  color: var(--black);
  text-transform: uppercase;
  font-weight: bold;
  white-space: nowrap;
  overflow: hidden;
}
.ticker::before {
  content: 'new';
  position: absolute;
  display: grid;
  place-items: center;
  width: 40px;
  height: 30px;
  margin: auto;
  font-size: 10px;
  border-radius: 15px;
  background-color: var(--black);
  color: var(--white);
  z-index: 10;
  top: 0;
  bottom: 0;
  left: 15px;
}
.ticker::after {
  content: '';
  position: absolute;
  display: block;
  width: 115px;
  height: inherit;
  top: 0;
  background: linear-gradient(to right, rgb(255, 213, 0) 50%, rgba(255, 213, 0, 0) 100%);
}

.ticker__text {
  display: inline-block;
  height: inherit;
  padding: calc((47px) / 2) 0;
  padding-left: 0.5em;
  font-size: 13px;
  line-height: 1;
  letter-spacing: 0.05em;

  animation-name: tickerAnimation;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

@keyframes tickerAnimation {
  0% {
    transform: translateX(0%);
  }
  100% {
    transform: translateX(-100%);
  }
}
!

JS 

              
                // 要素の複製
const cloneElements = (element, numberOfCopies) => {
  for (let i = 0; i < numberOfCopies - 1; i++) {
    const clone = element.cloneNode(true);
    element.after(clone);
  }
};

// アニメーションの時間設定
const setDuration = (element, setSpeed) => {
  const tickerText = element;
  const textWidth = tickerText.offsetWidth;
  const speed = setSpeed || 50;
  const animationDuration = textWidth / speed;

  tickerText.style.animationDuration = `${animationDuration}s`;
};

// 複数の要素に対応
document.querySelectorAll('.js-ticker').forEach((element) => {
  const numberOfCopies = Number(element.getAttribute('data-clone')) || 5;
  const speed = Number(element.getAttribute('data-speed'));
  const textElement = element.querySelector('.js-ticker-text');

  cloneElements(textElement, numberOfCopies);

  const textElements = element.querySelectorAll('.js-ticker-text');
  textElements.forEach((el) => {
    setDuration(el, speed);
  });
});
!
999px

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