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ある程度スクロールするとじわっと表示させる

Last updated at Posted at 2021-06-11

#やる事
スクロールをしていって、要素がスクリーンのある程度に来るとじわっと表示させる。

#方法

html
<section class="fadein">
 <!--何かしらの要素を入れる-->
</section>
javascript
$(function(){
  $(window).scroll(function (){
    $(".fadein").each(function(){
      let imgPos = $(this).offset().top;
      let scroll = $(window).scrollTop();
      let windowHeight = $(window).height();
      if (scroll > imgPos - windowHeight + 250){ //ここの数値を変えて表示させる箇所を変更する
        $(this).addClass("fadein_scroll");
      } else {
        $(this).removeClass("fadein_scroll");
      }
    });
  });
});
css
.fadein {
	opacity: 0;
    -webkit-transition: all 1s;
    -moz-transition: all 1s;
    -o-transition: all 1s;
    -ms-transition: all 1s;
    transition: all 1s;
	}

.fadein_scroll {
	opacity : 1;
	}
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