当前元素成为中心时，下一个元素如何按中心滚动？

问题描述 投票：6回答：1

我想做的事

like this

像这样，最初是切换滚动。 当当前（活动）元素到达中心时，下一个元素也希望能够在中心滚动。

this

当它看到底部元素时，滚动停止并且它变为开关滚动。

当前状态

我已经有一个开关滚动和一个代码来获得中心。 demo - JSFiddle

目前这不起作用，但我写了以下代码：

// Get the center of the height of .main
const rect = document.getElementsByClassName("main")[0].getBoundingClientRect();
const mainHCenter = rect.top + (rect.height / 2);
const mainWCenter = rect.left + (rect.width / 2);

// Get the element at the center of the height of .main
const centerElm = document.elementFromPoint(mainWCenter, mainHCenter);

if ($("p.active") === centerElm) {
      $(".mai").scroll().css('top',mainHCenter + 'px');
} else {
  $(".mai").scroll(function(e) {
    e.preventDefault();
  });
}

问：我应该怎么做才能做像gif这样的事情？

先感谢您。

码

function onScroll() {
  $(".main > p").each(function(i) {
    $(this).removeClass('active');

    if ($(this).attr('class').includes(i) && i === swiperCnt.activeIndex) {
      $(this).addClass('active');
    }

/* from here */
// Get the center of the height of .main
    const rect = document.getElementsByClassName("main")[0].getBoundingClientRect();
    const mainHCenter = rect.top + (rect.height / 2);
    const mainWCenter = rect.left + (rect.width / 2);
    
// Get the element at the center of the height of .main
    const centerElm = document.elementFromPoint(mainWCenter, mainHCenter);
    
    if ($("p.active") === centerElm) {
          $(".mai").scroll().css('top',mainHCenter + 'px');
    } else {
      $(".mai").scroll(function(e) {
        e.preventDefault();
      });
    }
/* to here */

  });
}



/* swiper (doesn't matter) */
var swiperCnt = new Swiper('.swiperCnt', {
  direction: 'vertical',
  autoHeight: true,
  pagination: {
    el: '.swiper-pagination',
    type: 'bullets',
    clickable: 'true',
  },
  keyboard: {
    enabled: true,
  },
  mousewheel: {
    forceToAxis: true,
    invert: true,
  },
  renderBullet: function(index, className) {
    return '<span class="' + className + '">' + (index + 1) + '</span>';
  },
});


$(function() {
  var that;
  var i = 0;
  var j = $(".main > p").length - 1;
  $('.mai').bind('mousewheel', function(e) {
    if (e.originalEvent.wheelDelta < 0) {
      //scroll down
      i++;
      if (i >= j) {
        i = j;
      }
      if (i <= j) {
        $(".main > p").each(function(i) {
          if ($(this).hasClass('active')) {
            if ($(this).hasClass(i)) {
              if (i < j) {
                that = $(this).next();
              } else {
                that = $(this);
              }
            }
          }
          $(this).removeClass('active');
        });
        $(that).addClass('active');
      }
    } else {
      //scroll up
      i--;
      if (i <= 0) {
        i = 0;
      }
      if (i >= 0) {
        $(".main > p").each(function(i) {
          if ($(this).hasClass('active')) {
            if (i > 0) {
              that = $(this).prev();
            } else {
              that = $(this);
            }
          }
          $(this).removeClass('active');
        });
        $(that).addClass('active');
      }
    }
    swiperCnt.slideTo(i);
    //prevent page from scrolling
    return false;
  });
  swiperCnt.on('scroll', function() {
    onScroll();
  });
  swiperCnt.on('paginationUpdate', function() {
    onScroll();
  });
  onScroll();
});
/* The corresponding part is at the bottom too. (It is faster to count from the bottom)
(There is a mark in the comment) */


html {
  font-size: 62.5%;
  height: 100%;
}

body {
  font-size: 1.5rem;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: #c6d2dd;
  color: white;
}

#wrap {
  display: flex;
  width: 100%;
  height: 100vh;
  padding: 1.8rem 4.7rem 2.7rem 2.4rem;
}

h2, h3, h4, h5, h6 {
  display: inline;
}

.mission, .m-p, .concept, .c-p, .what, .target, .t-p, .main-p, .nb, .nb-p, .period, .p-p, .category, .cg-p, .class, .cl-p, .release, .r-p, .nbb, .per, .cat, .cla, .rel {
  display: inline-block;
}

#left, #right {
  display: flex;
  flex-direction: column;
  height: 100%;
  max-height: 100%;
}

#left {
  width: 57%;
}

#right {
  position: relative;
  width: 43%;
  padding-left: 6.5rem;
}

.title {
  height: 3.55rem;
  font-size: 1.8rem;
  padding-bottom: 1.7rem;
}

.solid-ti {
  position: absolute;
  width: 100%;
  border-top: 0.1rem solid white;
  margin-top: 5.35rem;
}

.solid-mc {
  border-bottom: 0.1rem solid white;
  margin-left: -2.4rem;
}

.solid-tm {
  border-bottom: 0.1rem solid white;
  margin-right: -4.7rem;
}

.swiper-pagination {
  top: 6rem;
}

.max {
  position: relative;
  width: 100%;
  flex: 1;
}

.max-inner {
  position: absolute;
  width: 100%;
  height: 100%;
}

.swiper-slide {
  display: flex;
  align-items: center;
}
.swiper-slide img {
  width: 100%;
}

.swiperP {
  height: auto;
}

.swiper-pagination-bullet {
  background: none;
  font-size: 1rem;
  margin-right: 0.5rem;
  opacity: 0.3;
}
.swiper-pagination-bullet::before {
  content: "0";
  font-weight: bold;
}
.swiper-pagination-bullet:hover::before {
  content: "1";
  font-weight: bold;
}

.swiper-pagination-bullet-active {
  background: none;
  transform: scale(1);
  transition-duration: 0.16s;
  opacity: 0.7;
}
.swiper-pagination-bullet-active::before {
  content: "1";
  font-weight: bold;
}

.mis {
  padding: 2.6rem 0 0.7rem 0;
}

.mission {
  padding-right: 2rem;
}

.con {
  padding-top: 0.7rem;
}

.concept {
  padding-right: 2rem;
}

.what {
  margin: 2rem 1.5rem 0 0;
  display: flex;
  align-items: center;
}
.what > img {
  height: 2rem;
  margin-right: 0.3rem;
}
.what > img:last-child {
  margin-right: 1rem;
}
.what span {
  font-size: 1.4rem;
  border: 0.1rem solid white;
  border-radius: 0.3rem;
  margin-right: 1rem;
  padding: 0.5rem 0.4rem 0.4rem;
}

.tar {
  padding: 2.2rem 0 2rem 0;
  flex-grow: 1;
}

.target {
  padding-right: 1.2rem;
}

.t-p {
  vertical-align: top;
}

.heartbox {
  display: flex;
  align-items: center;
}
.heartbox div:last-child {
  user-select: none;
}

input {
  opacity: 0;
}

@keyframes rubberBand {
  from {
    transform: scale(1, 1, 1);
  }
  30% {
    transform: scale3d(1.15, 0.75, 1);
  }
  40% {
    transform: scale3d(0.75, 1.15, 1);
  }
  50% {
    transform: scale3d(1.1, 0.85, 1);
  }
  65% {
    transform: scale3d(0.95, 1.05, 1);
  }
  75% {
    transform: scale3d(1.05, 0.95, 1);
  }
  to {
    transform: scale3d(1, 1, 1);
  }
}
.heart {
  cursor: pointer;
  width: auto;
  height: 25px;
  fill: #E2E2E2;
}

#fav:checked + label .heart {
  fill: #e23b3b;
  animation: rubberBand 0.8s;
}





/*
 * from here
 */
.mai {
  margin: 2.8rem 0 0 0;
  height: 37.8rem;
  overflow-y: scroll;
  overflow-x: hidden;
  -ms-overflow-style: none;
}
.mai::-webkit-scrollbar {
  display: none;
}

.main p {
  opacity: 0.3;
}
.main .active {
  opacity: 1;
}

/*
 * to here
 */





.▼ {
  align-self: flex-end;
  margin: 1.3rem 1.5rem 7.9625rem 0;
}

.R-under {
  text-align: right;
  position: absolute;
  right: 0;
  bottom: 0;
}

.nbb {
  padding-right: 4.8rem;
}

.nb {
  padding-right: 0.8rem;
}

.period {
  padding-right: 1.6rem;
}

.top {
  display: flex;
  justify-content: space-between;
  font-size: 1.1rem;
  padding: 0.3rem 0 2rem;
  text-align: right;
}

.category {
  padding-right: 1.4rem;
}

.class {
  padding-right: 1.4rem;
}

.release {
  padding-right: 1.4rem;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/Swiper/4.5.0/css/swiper.min.css" rel="stylesheet"/>

<!-- The corresponding part is at the bottom. (It is faster to count from the bottom)
(There is a mark in the comment) -->

<div class="solid-ti"></div>

<div id="wrap">
  <div id="left">
    <h1 class="title">動と静を共有する椅子「Rollse」</h1>

    <div class="swiper-pagination"></div>
    <div class="swiper-container swiperCnt max">
      <div class="swiper-wrapper imgs max-inner">
        <div class="swiper-slide"><img class="work" src="http://placehold.jp/45/1920a6/ffffff/693x350.png?text=1" alt="Rollse-logo" /></div>
        <div class="swiper-slide"><img class="work" src="http://placehold.jp/45/199fa6/ffffff/693x350.png?text=2" alt="Rollse-killer" /></div>
        <div class="swiper-slide"><img class="work" src="http://placehold.jp/45/a61972/ffffff/693x350.png?text=3" alt="Rollse-data" /></div>
        <div class="swiper-slide"><img class="work" src="http://placehold.jp/45/a6a619/ffffff/693x350.png?text=4" alt="Rollse-image" /></div>
      </div>
    </div>

    <div class="L-under">
      <div class="mis">
        <h3 class="mission">MISSION:</h3>
        <p class="m-p">触覚に訴えるプロダクト　　　▶︎ 3人チームの1人が、この触り心地を発見</p>
      </div>

      <div class="solid-mc"></div>

      <div class="con">
        <h2 class="concept">CONCEPT:</h2>
        <p class="c-p">緊張感のある空間をつくる。</p>
      </div>

      <div class="what">
        <img src="http://placehold.jp/45/d4d4d4/d4d4d4/28x20.png?text=_" alt="2nd" /><img src="http://placehold.jp/45/d4d4d4/d4d4d4/20x20.png?text=_" alt="ai" /><img src="http://placehold.jp/45/d4d4d4/d4d4d4/20x20.png?text=_" alt="vw" />

        <span>企画</span>
        <span>雑貨の設計</span>
        <span>ネーミング</span>
        <span>文章</span>
        <span>展開</span>
      </div>
    </div>
  </div>

  <div id="right">
    <div class="top">
      <div class="cat">
        <h5 class="category">CATEGORY:</h5>
        <p class="cg-p">雑貨・プロダクト</p>
      </div>

      <div class="cla">
        <h5 class="class">CLASS:</h5>
        <p class="cl-p">デザイン研究</p>
      </div>

      <div class="rel">
        <h5 class="release">RELEASE:</h5>
        <p class="r-p">2017/06</p>
      </div>
    </div>
    <div class="heartbox">
      <div class="tar">
        <h3 class="target">TARGET:</h3>
        <p class="t-p">生活に刺激を求めている人<br> デザインされたものが好きな人
          <br> 動くのに若干抵抗がある人
        </p>
      </div>
      <div>
        <input type="checkbox" name="fav" id="fav">
        <label for="fav">
            <svg class="heart" version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg"
              xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 37 32"
              style="enable-background:new 0 0 37 32;" xml:space="preserve">
              <path class="st0" d="M27,0c-2.5,0-4.9,0.9-6.7,2.6C19.6,3.2,19,4,18.5,4.7C18,4,17.4,3.2,16.7,2.6C14.9,0.9,12.5,0,10,0
            C4.5,0,0,4.5,0,10c0,3.7,1.2,6.7,3.9,9.8c3.9,4.6,13.9,11.6,14.3,11.9c0.1,0.1,0.2,0.1,0.3,0.1s0.2,0,0.3-0.1
            c0.4-0.3,10.4-7.3,14.3-11.9c2.7-3.2,3.9-6.1,3.9-9.8C37,4.5,32.5,0,27,0z" /></svg>
          </label>
      </div>
    </div>

    <div class="solid-tm"></div>





    <!--
from here
-->
    <div class="mai max">
      <section class="main max-inner">
        <p class="active 0">This part is Switch scroll. (move by scrolling) <br> rolls（渦）×rose（バラ）<br> モチーフの見た目から命名しました。
          <br> “R”は小文字より大文字にすることで、凛々しさを演出し、
          <br> 大人の美しさを際立たせました。
        </p>
        <br>
        <p class="1">触覚に訴える。それで日常の問題を解決できたら。ついつい無駄に過ごしてしまいがちな日常。<br> そこであえて触感の悪いものを提供して、その無駄な時間を少しでも減らせる手助けになる商品をつくりました。
        </p>
        <br>
        <p class="2">無数の紙を渦状に丸めた形状によって、片面は固く、もう片面は程よく弾力のある、画期的な椅子になっています。<br> 様々な素材や大きさのロールによるカスタム仕様なので、様々な展開が可能です。
        </p>
        <p class="3">毎日の慣れた生活空間の中に新感覚の刺激を与えてくれ、エキサイティングな感覚と少しのスリルを味わうことができます。</p>
      </section>
    </div>
    <!-- 
to here
-->





    <img src="http://placehold.jp/45/d4d4d4/d4d4d4/14x12.png?text=_" alt="▼" class="▼" width="14" />

    <div class="R-under">
      <div class="nbb">
        <h4 class="nb">N.B.:</h4>
        <p class="nb-p">投票第１位</p>
      </div>

      <div class="per">
        <h4 class="period">PERIOD:</h4>
        <p class="p-p">1週間</p>
      </div>
    </div>
  </div>
</div>


<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Swiper/4.5.0/js/swiper.min.js"></script>
javascript jquery html css html5
1个回答
0
投票

更新。

你可以在https://gist.github.com/jacobsun/1e2eff94b082ed446c730027c241fe03找到js文件

HTML结构如下：

    <div class="lazy-scroll-wrapper">
        <div class="lazy-scroll-itemlist">
            <div class="lazy-scroll-item a">A</div>
            <div class="lazy-scroll-item b">B</div>
            <div class="lazy-scroll-item c">C</div>
            <div class="lazy-scroll-item d">D</div>
            <div class="lazy-scroll-item e">E</div>
            <div class="lazy-scroll-item f">F</div>
            <div class="lazy-scroll-item g">G</div>
        </div>
    </div>

加载脚本后，运行

 lazyScroll({
    height: '400px', // required, wrapper height
    itemHeight: '50px', // required, item height

    wrapper: '.lazy-scroll-wrapper', // optional, selector
    itemlist: '.lazy-scroll-itemlist', // optional, selector
    item: '.lazy-scroll-item', // optional, selector
    // optional, default: 0, allow up and down,
    // 1: no scroll down, -1: no scroll up
    noDirection: 0,
    highlightClass: 'highlight', // optional, current highlght class, no dot
    step: 3 // optional, control scroll speed
  })

脚本的主要缺点是你必须手动编码元素外观，我的意思是宽度，高度，边距...我找不到一个简单的方法来解决脚本问题。例如在简单的滚动效果中可以看到多少个元素，这不是问题。但就我们而言，我们必须知道何时不需要滚动。如果让脚本处理属性，会有很多复杂的计算。

但是：ぁzxswい

我使用mousewheel，这是一个不推荐的事件，我发现它是一个可靠而简单的，如果你有更好的解决方案，请评论。

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