swiper/core/events/onResize.js

export default function onResize() {
  const swiper = this;
  const {
    params,
    el
  } = swiper;
  if (el && el.offsetWidth === 0) return; // Breakpoints

  if (params.breakpoints) {
    swiper.setBreakpoint();
  } // Save locks


  const {
    allowSlideNext,
    allowSlidePrev,
    snapGrid
  } = swiper; // Disable locks on resize

  swiper.allowSlideNext = true;
  swiper.allowSlidePrev = true;
  swiper.updateSize();
  swiper.updateSlides();
  swiper.updateSlidesClasses();

  if ((params.slidesPerView === 'auto' || params.slidesPerView > 1) && swiper.isEnd && !swiper.isBeginning && !swiper.params.centeredSlides) {
    swiper.slideTo(swiper.slides.length - 1, 0, false, true);
  } else {
    swiper.slideTo(swiper.activeIndex, 0, false, true);
  }

  if (swiper.autoplay && swiper.autoplay.running && swiper.autoplay.paused) {
    swiper.autoplay.run();
  } // Return locks after resize


  swiper.allowSlidePrev = allowSlidePrev;
  swiper.allowSlideNext = allowSlideNext;

  if (swiper.params.watchOverflow && snapGrid !== swiper.snapGrid) {
    swiper.checkOverflow();
  }
}