Method setActiveItem

src/carousel/Carousel.jsx:157–187

(index: number)

  }

  setActiveItem(index: number): void {
    let { activeIndex } = this.state;

    if (typeof index === 'string') {
      const filteredItems = this.state.items.filter(item => item.props.name === index);

      if (filteredItems.length > 0) {
        index = this.state.items.indexOf(filteredItems[0]);
      }
    }

    index = Number(index);

    if (isNaN(index) || index !== Math.floor(index)) {
      process.env.NODE_ENV !== 'production' &&
      console.warn('[Element Warn][Carousel]index must be an integer.');
      return;
    }

    let length = this.state.items.length;

    if (index < 0) {
      activeIndex = length - 1;
    } else if (index >= length) {
      activeIndex = 0;
    } else {
      activeIndex = index;
    }

    this.setState({ activeIndex });
  }

  prev(): void {
    this.setActiveItem(this.state.activeIndex - 1);