Slick carousel adaptive height not working

Slick adaptive height not working

by joshmoto

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick-theme.min.css">
<div class="slider">
  <div class="aslide">1</div>
  <div class="aslide">2<br/>2<br/>2</div>
  <div class="aslide">3<br/>3<br/>3<br/>3<br/>3</div>
  <div class="aslide">4<br/>4<br/>4</div>
  <div class="aslide">5</div>
  <div class="aslide">6<br/>6<br/>6</div>
  <div class="aslide">7<br/>7<br/>7<br/>7<br/>7</div>
  <div class="aslide">8<br/>8</div>
  <div class="aslide">9<br/>9<br/>9<br/>9<br/>9<br/>9</div>
  <div class="aslide">10<br/>10<br/>10</div>
  <div class="aslide">11</div>
  <div class="aslide">12<br/>12</div>
</div>

CSS

body {
  background: skyblue;
  margin: 0;
  padding: 20px;
}

.slick-list {
  transition: all .5s ease;
}

.aslide {
  background: yellow;
}

JavaScript

// my slick slider options
var options = {
  slidesToShow: 2,
  slidesToScroll: 2,
  dots: true,
  arrows: false,
  dotsClass: 'slick-dots slick-dots-black',
  adaptiveHeight: true,
};


// my slick slider as constant object
const mySlider = $('.slider').on('init', function(slick) {

  // on init run our multi slide adaptive height function
  multiSlideAdaptiveHeight(this);

}).on('beforeChange', function(slick, currentSlide, nextSlide) {

  // on beforeChange run our multi slide adaptive height function
  multiSlideAdaptiveHeight(this);

}).slick(options);


// our multi slide adaptive height function passing slider object
function multiSlideAdaptiveHeight(slider) {

  // set our vars
  let activeSlides = [];
  let tallestSlide = 0;

  // very short delay in order for us get the correct active slides
  setTimeout(function() {

    // loop through each active slide for our current slider
    $('.slick-track .slick-active', slider).each(function(i) {

      // add current active slide height to our active slides array
      activeSlides[i] = $(this).outerHeight();

    });

    // for each of the active slides heights
    activeSlides.forEach(function(item) {

      // if current active slide height is greater than tallest slide height
      if (item > tallestSlide) {

        // override tallest slide height to current active slide height
        tallestSlide = item;

      }

    });

    // set the current slider slick list height to current active tallest slide height
    $('.slick-list', slider).height(tallestSlide);

  }, 10);

}


// when window is resized
$(window).on('resize', function() {

  // run our multi slide adaptive height function incase current slider active slides change height responsively
  multiSlideAdaptiveHeight(mySlider);

});