【Javascript】お知らせを縦スクロールアニメーションで表示する・ニュースティッカーのサンプルプログラム (Class定義版)

<div class="news_area">
  <div id="news_ticker" class="news_ticker">
    <div class="news_ticker_inner">
      <div class="list">
        <article class="item">
          <p class="time">2021/4/1</p>
          <h3 class="title">
            タイトル1
          </h3>
        </article>
        <article class="item">
          <p class="time">2021/5/1</p>
          <h3 class="title">
            タイトル2
          </h3>
        </article>
        <article class="item">
          <p class="time">2021/6/1</p>
          <h3 class="title">
            タイトル3
          </h3>
        </article>
      </div>
    </div>
  </div>
</div>

.time, .title {
    display: inline;
  }

  .news_ticker .news_ticker_inner {
    height: 30px;
    overflow: hidden;
    width: 400px;
    border: 1px solid #aaa;
  }

  .news_ticker .posts {
    padding: 0 0 0 38px;
    position: relative;
  }

  .news_area {
    border: 1px solid #333;
    padding: 10px;
  }

 $(document).ready(function(){
    var newsTicker = new  NewsTicker('#news_ticker','.list', '.item');
    newsTicker.autoPlay();
  });

  class NewsTicker{
    constructor(newsticker_elm, list_elm, item_elm){
      this.ticker = $(newsticker_elm);
      this.list = this.ticker.find(list_elm);
      this.item = this.ticker.find(item_elm);
      this.clone = this.item.eq(0).clone().addClass('is-clone');

      this.timer;
      this.current = 1;
      this.num_of_item = this.item.length;
      this.distance = parseInt(this.item.css('height'),10);

      this.list.append(this.clone);
 
      self = this;

      this.ticker.on({
        'mouseenter': function(){
          clearTimeout(self.timer);

        },
        'mouseleave': function(){
          self.autoPlay();
        }
      });
    }
    rotate(){
      this.list.stop().animate({
        top: self.distance * self.current * -1,
      },
        1500, function() {
          if (self.current >= self.num_of_item) {
            self.current = 1;
            self.list.css({top: 0});
          } else {
            self.current++;
          }
        });
    } 
    autoPlay() {
      this.timer = setInterval(function() {
        self.rotate();
      }, 3500);
    }
  }