JSFiddle - React, Tailwind, and code Playground

by programko

HTML

<div id="app"></div>

CSS

.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -22px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}


.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}


.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}


.text {
  color: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  position: absolute;
  bottom: 8px;
  width: 100%;
  text-align: center;
  box-sizing: border-box;
}


.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}


.dots {
  display: flex;
  justify-content: center;
}

.dot {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active, .dot:hover {
  background-color: #717171;
}

.mySlides img {
  width: 100%;
}

Babel + JSX

class Slider extends Component {
  state = {
    active: 0
  };

  componentDidMount() {
    const { items } = this.props;

    this.timeout = setTimeout(
      () => this.updateActive(this.state.active, 1, items.length),
      5000
    );
  }
  componentDidUpdate(prevProps, prevState) {
    const { items } = this.props;
    const { active } = this.state;

    if (
      prevState.active !== active ||
      prevProps.items.length !== items.length
    ) {
      clearTimeout(this.timeout);
      this.timeout = setTimeout(
        () => this.updateActive(active, 1, items.length),
        5000
      );
    }
  }
  componentWillUnmount() {
    clearInterval(this.timeout);
  }

  updateActive = (active, step, length) => {
    this.setState({
      active: step ? (active + step + length) % length : active
    });
  };
  next = e =>
    this.setState({
      active: this.updateActive(
        this.state.active,
        +e.target.dataset.step,
        this.props.items.length
      )
    });
  goTo = e => this.updateActive(+e.target.dataset.index);

  render() {
    const { active } = this.state;
    const { items } = this.props;

    const { length, [active]: slide } = items;

    return (
      <div>
        <div className="slideshow-container">
          <div className="mySlides fade">
            <div className="numbertext">
              {active + 1} / {length}
            </div>
            <img src={slide.img} />
            <div className="text">{slide.title}</div>
          </div>
          <a className="prev" onClick={this.next} data-step={-1}>
            &#10094;
          </a>
          <a className="next" onClick={this.next} data-step={+1}>
            &#10095;
          </a>
        </div>
        <div className="dots">
          {items.map((n, i) => (
            <span
              key={n.id}
              className={`dot ${i === active ? "active" : ""}`}
              onClick={this.goTo}
              data-index={i}
            />
          ))}
       ...