swiper/src/components/core/update/updateAutoHeight.js

Most modern mobile touch slider and framework with hardware accelerated transitions

export default function (speed) {
  const swiper = this;
  const activeSlides = [];
  let newHeight = 0;
  let i;
  if (typeof speed === 'number') {
    swiper.setTransition(speed);
  } else if (speed === true) {
    swiper.setTransition(swiper.params.speed);
  }
  // Find slides currently in view
  if (swiper.params.slidesPerView !== 'auto' && swiper.params.slidesPerView > 1) {
    if (swiper.params.centeredSlides) activeSlides.push(...swiper.visibleSlides);
    else {
      for (i = 0; i < Math.ceil(swiper.params.slidesPerView); i += 1) {
        const index = swiper.activeIndex + i;
        if (index > swiper.slides.length) break;
        activeSlides.push(swiper.slides.eq(index)[0]);
      }
    }
  } else {
    activeSlides.push(swiper.slides.eq(swiper.activeIndex)[0]);
  }

  // Find new height from highest slide in view
  for (i = 0; i < activeSlides.length; i += 1) {
    if (typeof activeSlides[i] !== 'undefined') {
      const height = activeSlides[i].offsetHeight;
      newHeight = height > newHeight ? height : newHeight;
    }
  }

  // Update Height
  if (newHeight) swiper.$wrapperEl.css('height', `${newHeight}px`);
}