Slider owl được viết dưới dạng Thumnail (0k)

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SliderowlThumnail

https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.0.0-beta.3/assets/owl.carousel.min.css
https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.0.0-beta.3/assets/owl.theme.default.min.css
https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css

https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js
https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.0.0-beta.3/owl.carousel.min.js

<div class="outer">
<div id="big" class="owl-carousel owl-theme">
  <div class="item">
    <h1>1</h1>
  </div>
  <div class="item">
    <h1>2</h1>
  </div>
  <div class="item">
    <h1>3</h1>
  </div>
  <div class="item">
    <h1>4</h1>
  </div>
  <div class="item">
    <h1>5</h1>
  </div>
  <div class="item">
    <h1>6</h1>
  </div>
  <div class="item">
    <h1>7</h1>
  </div>
  <div class="item">
    <h1>8</h1>
  </div>
      <div class="item">
    <h1>9</h1>
  </div>
    <div class="item">
    <h1>10</h1>
  </div>
</div>
<div id="thumbs" class="owl-carousel owl-theme">
  <div class="item">
    <h1>1</h1>
  </div>
  <div class="item">
    <h1>2</h1>
  </div>
  <div class="item">
    <h1>3</h1>
  </div>
  <div class="item">
    <h1>4</h1>
  </div>
  <div class="item">
    <h1>5</h1>
  </div>
  <div class="item">
    <h1>6</h1>
  </div>
  <div class="item">
    <h1>7</h1>
  </div>
  <div class="item">
    <h1>8</h1>
  </div>
    <div class="item">
    <h1>9</h1>
  </div>
    <div class="item">
    <h1>10</h1>
  </div>
</div>
</div>

.outer { margin:0 auto; max-width:800px;}
#big .item { background: #ec6e46; padding: 120px 0px; margin:2px; color: #FFF; border-radius: 3px; text-align: center; }
#thumbs .item { background: #C9C9C9; height:70px; line-height:70px; padding: 0px; margin:2px; color: #FFF; border-radius: 3px; text-align: center; cursor: pointer; }
#thumbs .item h1 { font-size: 18px; }
#thumbs .current .item { background:#FF5722; }
.owl-theme .owl-nav [class*='owl-'] { -webkit-transition: all .3s ease; transition: all .3s ease; }
.owl-theme .owl-nav [class*='owl-'].disabled:hover { background-color: #D6D6D6; }
#big.owl-theme { position: relative; }
#big.owl-theme .owl-next, #big.owl-theme .owl-prev { background:#333; width: 22px; line-height:40px; height: 40px; margin-top: -20px; position: absolute; text-align:center; top: 50%; }
#big.owl-theme .owl-prev { left: 10px; }
#big.owl-theme .owl-next { right: 10px; }
#thumbs.owl-theme .owl-next, #thumbs.owl-theme .owl-prev { background:#333; }

$(document).ready(function() {
  var bigimage = $("#big");
  var thumbs = $("#thumbs");
  //var totalslides = 10;
  var syncedSecondary = true;

  bigimage
    .owlCarousel({
    items: 1,
    slideSpeed: 2000,
    nav: true,
    autoplay: true,
    dots: false,
    loop: true,
    responsiveRefreshRate: 200,
    navText: [
      '<i class="fa fa-arrow-left" aria-hidden="true"></i>',
      '<i class="fa fa-arrow-right" aria-hidden="true"></i>'
    ]
  })
    .on("changed.owl.carousel", syncPosition);

  thumbs
    .on("initialized.owl.carousel", function() {
    thumbs
      .find(".owl-item")
      .eq(0)
      .addClass("current");
  })
    .owlCarousel({
    items: 4,
    dots: true,
    nav: true,
    navText: [
      '<i class="fa fa-arrow-left" aria-hidden="true"></i>',
      '<i class="fa fa-arrow-right" aria-hidden="true"></i>'
    ],
    smartSpeed: 200,
    slideSpeed: 500,
    slideBy: 4,
    responsiveRefreshRate: 100
  })
    .on("changed.owl.carousel", syncPosition2);

  function syncPosition(el) {
    //if loop is set to false, then you have to uncomment the next line
    //var current = el.item.index;

    //to disable loop, comment this block
    var count = el.item.count - 1;
    var current = Math.round(el.item.index - el.item.count / 2 - 0.5);

    if (current < 0) {
      current = count;
    }
    if (current > count) {
      current = 0;
    }
    //to this
    thumbs
      .find(".owl-item")
      .removeClass("current")
      .eq(current)
      .addClass("current");
    var onscreen = thumbs.find(".owl-item.active").length - 1;
    var start = thumbs
    .find(".owl-item.active")
    .first()
    .index();
    var end = thumbs
    .find(".owl-item.active")
    .last()
    .index();

    if (current > end) {
      thumbs.data("owl.carousel").to(current, 100, true);
    }
    if (current < start) {
      thumbs.data("owl.carousel").to(current - onscreen, 100, true);
    }
  }

  function syncPosition2(el) {
    if (syncedSecondary) {
      var number = el.item.index;
      bigimage.data("owl.carousel").to(number, 100, true);
    }
  }

  thumbs.on("click", ".owl-item", function(e) {
    e.preventDefault();
    var number = $(this).index();
    bigimage.data("owl.carousel").to(number, 300, true);
  });
});