在滚动上逐个添加类

Question

我试图将一个元素逐个添加到一组元素然后反向但不从组中的第一个项目中删除它。

这是我的HTML和CSS的小提琴。 https://jsfiddle.net/316n1xmL/

＆＃13;

＆＃13;

// Scroll Direction Plugin Move Later to own file

!function(a){"function"==typeof define&&define.amd?define(["jquery"],a):"object"==typeof exports?module.exports=a:a(jQuery)}(function(a){function b(b){var g=b||window.event,h=i.call(arguments,1),j=0,l=0,m=0,n=0,o=0,p=0;if(b=a.event.fix(g),b.type="mousewheel","detail"in g&&(m=-1*g.detail),"wheelDelta"in g&&(m=g.wheelDelta),"wheelDeltaY"in g&&(m=g.wheelDeltaY),"wheelDeltaX"in g&&(l=-1*g.wheelDeltaX),"axis"in g&&g.axis===g.HORIZONTAL_AXIS&&(l=-1*m,m=0),j=0===m?l:m,"deltaY"in g&&(m=-1*g.deltaY,j=m),"deltaX"in g&&(l=g.deltaX,0===m&&(j=-1*l)),0!==m||0!==l){if(1===g.deltaMode){var q=a.data(this,"mousewheel-line-height");j*=q,m*=q,l*=q}else if(2===g.deltaMode){var r=a.data(this,"mousewheel-page-height");j*=r,m*=r,l*=r}if(n=Math.max(Math.abs(m),Math.abs(l)),(!f||f>n)&&(f=n,d(g,n)&&(f/=40)),d(g,n)&&(j/=40,l/=40,m/=40),j=Math[j>=1?"floor":"ceil"](j/f),l=Math[l>=1?"floor":"ceil"](l/f),m=Math[m>=1?"floor":"ceil"](m/f),k.settings.normalizeOffset&&this.getBoundingClientRect){var s=this.getBoundingClientRect();o=b.clientX-s.left,p=b.clientY-s.top}return b.deltaX=l,b.deltaY=m,b.deltaFactor=f,b.offsetX=o,b.offsetY=p,b.deltaMode=0,h.unshift(b,j,l,m),e&&clearTimeout(e),e=setTimeout(c,200),(a.event.dispatch||a.event.handle).apply(this,h)}}function c(){f=null}function d(a,b){return k.settings.adjustOldDeltas&&"mousewheel"===a.type&&b%120===0}var e,f,g=["wheel","mousewheel","DOMMouseScroll","MozMousePixelScroll"],h="onwheel"in document||document.documentMode>=9?["wheel"]:["mousewheel","DomMouseScroll","MozMousePixelScroll"],i=Array.prototype.slice;if(a.event.fixHooks)for(var j=g.length;j;)a.event.fixHooks[g[--j]]=a.event.mouseHooks;var k=a.event.special.mousewheel={version:"3.1.12",setup:function(){if(this.addEventListener)for(var c=h.length;c;)this.addEventListener(h[--c],b,!1);else this.onmousewheel=b;a.data(this,"mousewheel-line-height",k.getLineHeight(this)),a.data(this,"mousewheel-page-height",k.getPageHeight(this))},teardown:function(){if(this.removeEventListener)for(var c=h.length;c;)this.removeEventListener(h[--c],b,!1);else this.onmousewheel=null;a.removeData(this,"mousewheel-line-height"),a.removeData(this,"mousewheel-page-height")},getLineHeight:function(b){var c=a(b),d=c["offsetParent"in a.fn?"offsetParent":"parent"]();return d.length||(d=a("body")),parseInt(d.css("fontSize"),10)||parseInt(c.css("fontSize"),10)||16},getPageHeight:function(b){return a(b).height()},settings:{adjustOldDeltas:!0,normalizeOffset:!0}};a.fn.extend({mousewheel:function(a){return a?this.bind("mousewheel",a):this.trigger("mousewheel")},unmousewheel:function(a){return this.unbind("mousewheel",a)}})});

$(document).ready(function() {

  $(window).mousewheel(function(turn, delta) {

    var tiles = $('.list-tile');
    if (delta == 1) {

    } else {
      $(tiles).next().not('animate-up').addClass('animate-up');
    }
  });

});

＆＃13;

.hero-list {
  height: 100vh;
  width: 100%;
  touch-action: pan-x;
  user-select: none;
  -webkit-user-drag: none;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  position: relative;
  overflow: hidden;
}

.hero-list .hero-list-container {
  position: relative;
  z-index: 901;
  height: 100vh;
  overflow: hidden;
}

.hero-list .hero-list-container .list-tile {
  width: 100%;
  height: 100vh;
  margin: 0 auto;
  position: absolute;
  top: 0;
  left: 0;
  box-sizing: border-box;
  overflow: hidden;
  transform: translate3d(0, 100%, 0);
  transition-duration: 1s;
  transition-property: transform;
  transition-timing-function: cubic-bezier(0.165, 0.84, 0.44, 1);
  transition-delay: 0s;
}

.hero-list .hero-list-container .list-tile:nth-of-type(2) {
  background-color: green;
}

.hero-list .hero-list-container .list-tile:nth-of-type(3) {
  background-color: blue;
}

.hero-list .hero-list-container .list-tile .module-background {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  display: block;
  transition-duration: 1s;
  transition-property: transform;
  transition-timing-function: cubic-bezier(0.165, 0.84, 0.44, 1);
  transition-delay: 0s;
  transform: translate3d(0, -20%, 0) scale(1.5);
}

.hero-list .hero-list-container .list-tile.animate-up {
  transform: translate3d(0, 0%, 0) scale(1) !important;
}

.hero-list .hero-list-container .list-tile.animate-up .module-background {
  transform: translate3d(0, 0%, 0) scale(1) !important;
}

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="hero-list">
  <div class="hero-list-container">
    <div class="list-tile animate-up">
      <div class="module-background" style="background-image: url('https://thomasstorage1.blob.core.windows.net/wp-media/2017/11/tech-background.png');				background-size: cover;">
      </div>
    </div>

    <div class="list-tile">
      <div class="module-background" style="background-image: url('https://thomasstorage1.blob.core.windows.net/wp-media/2017/11/tech-background.png'); background-size: cover;">
      </div>
    </div>

    <div class="list-tile">
      <div class="module-background" style="background-image: url('https://thomasstorage1.blob.core.windows.net/wp-media/2017/11/tech-background.png');				background-size: cover;">
      </div>
    </div>

    <div class="list-tile">
      <div class="module-background" style="background-image: url('https://thomasstorage1.blob.core.windows.net/wp-media/2017/11/tech-background.png');				background-size: cover;">
      </div>
    </div>
  </div>
</div>

＆＃13;

＆＃13;

＆＃13;

现在向下滚动它会将类添加到所有列表块中，我知道它为什么这样做。我接近一次，但它很笨重。

我尝试将这些项目放在一个似乎有效的数组中，但实际上是尝试将数组中的特定位置作为目标返回undefined。

Answer 1

您不需要在jquery选择器中包装标题，因为它已经是jQuery集合。 Next（）不是你想要的函数，因为它获取集合中每个元素的兄弟（在这种情况下已经是你的所有目标元素）。

我更改了代码以过滤掉已经设置为动画的那些代码，然后使用eq（0）来挑选该过滤集合中的第一个元素。

请注意，mousewheel事件的触发速度非常快，因此您可能需要添加一种限制方法来获得您想象的实际效果。

// Scroll Direction Plugin Move Later to own file

!function(a){"function"==typeof define&&define.amd?define(["jquery"],a):"object"==typeof exports?module.exports=a:a(jQuery)}(function(a){function b(b){var g=b||window.event,h=i.call(arguments,1),j=0,l=0,m=0,n=0,o=0,p=0;if(b=a.event.fix(g),b.type="mousewheel","detail"in g&&(m=-1*g.detail),"wheelDelta"in g&&(m=g.wheelDelta),"wheelDeltaY"in g&&(m=g.wheelDeltaY),"wheelDeltaX"in g&&(l=-1*g.wheelDeltaX),"axis"in g&&g.axis===g.HORIZONTAL_AXIS&&(l=-1*m,m=0),j=0===m?l:m,"deltaY"in g&&(m=-1*g.deltaY,j=m),"deltaX"in g&&(l=g.deltaX,0===m&&(j=-1*l)),0!==m||0!==l){if(1===g.deltaMode){var q=a.data(this,"mousewheel-line-height");j*=q,m*=q,l*=q}else if(2===g.deltaMode){var r=a.data(this,"mousewheel-page-height");j*=r,m*=r,l*=r}if(n=Math.max(Math.abs(m),Math.abs(l)),(!f||f>n)&&(f=n,d(g,n)&&(f/=40)),d(g,n)&&(j/=40,l/=40,m/=40),j=Math[j>=1?"floor":"ceil"](j/f),l=Math[l>=1?"floor":"ceil"](l/f),m=Math[m>=1?"floor":"ceil"](m/f),k.settings.normalizeOffset&&this.getBoundingClientRect){var s=this.getBoundingClientRect();o=b.clientX-s.left,p=b.clientY-s.top}return b.deltaX=l,b.deltaY=m,b.deltaFactor=f,b.offsetX=o,b.offsetY=p,b.deltaMode=0,h.unshift(b,j,l,m),e&&clearTimeout(e),e=setTimeout(c,200),(a.event.dispatch||a.event.handle).apply(this,h)}}function c(){f=null}function d(a,b){return k.settings.adjustOldDeltas&&"mousewheel"===a.type&&b%120===0}var e,f,g=["wheel","mousewheel","DOMMouseScroll","MozMousePixelScroll"],h="onwheel"in document||document.documentMode>=9?["wheel"]:["mousewheel","DomMouseScroll","MozMousePixelScroll"],i=Array.prototype.slice;if(a.event.fixHooks)for(var j=g.length;j;)a.event.fixHooks[g[--j]]=a.event.mouseHooks;var k=a.event.special.mousewheel={version:"3.1.12",setup:function(){if(this.addEventListener)for(var c=h.length;c;)this.addEventListener(h[--c],b,!1);else this.onmousewheel=b;a.data(this,"mousewheel-line-height",k.getLineHeight(this)),a.data(this,"mousewheel-page-height",k.getPageHeight(this))},teardown:function(){if(this.removeEventListener)for(var c=h.length;c;)this.removeEventListener(h[--c],b,!1);else this.onmousewheel=null;a.removeData(this,"mousewheel-line-height"),a.removeData(this,"mousewheel-page-height")},getLineHeight:function(b){var c=a(b),d=c["offsetParent"in a.fn?"offsetParent":"parent"]();return d.length||(d=a("body")),parseInt(d.css("fontSize"),10)||parseInt(c.css("fontSize"),10)||16},getPageHeight:function(b){return a(b).height()},settings:{adjustOldDeltas:!0,normalizeOffset:!0}};a.fn.extend({mousewheel:function(a){return a?this.bind("mousewheel",a):this.trigger("mousewheel")},unmousewheel:function(a){return this.unbind("mousewheel",a)}})});

$(document).ready(function() {

  $(window).mousewheel(function(turn, delta) {

    var tiles = $('.list-tile');
    if (delta == 1) {
      tiles.filter('.animate-up').last().removeClass('animate-up');
    } else {
      tiles.not('.animate-up').eq(0).addClass('animate-up');
    }
  });

});

.hero-list {
  height: 100vh;
  width: 100%;
  touch-action: pan-x;
  user-select: none;
  -webkit-user-drag: none;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  position: relative;
  overflow: hidden;
}

.hero-list .hero-list-container {
  position: relative;
  z-index: 901;
  height: 100vh;
  overflow: hidden;
}

.hero-list .hero-list-container .list-tile {
  width: 100%;
  height: 100vh;
  margin: 0 auto;
  position: absolute;
  top: 0;
  left: 0;
  box-sizing: border-box;
  overflow: hidden;
  transform: translate3d(0, 100%, 0);
  transition-duration: 1s;
  transition-property: transform;
  transition-timing-function: cubic-bezier(0.165, 0.84, 0.44, 1);
  transition-delay: 0s;
}

.hero-list .hero-list-container .list-tile:nth-of-type(2) {
  background-color: green;
}

.hero-list .hero-list-container .list-tile:nth-of-type(3) {
  background-color: blue;
}

.hero-list .hero-list-container .list-tile .module-background {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  display: block;
  transition-duration: 1s;
  transition-property: transform;
  transition-timing-function: cubic-bezier(0.165, 0.84, 0.44, 1);
  transition-delay: 0s;
  transform: translate3d(0, -20%, 0) scale(1.5);
}

.hero-list .hero-list-container .list-tile.animate-up {
  transform: translate3d(0, 0%, 0) scale(1) !important;
}

.hero-list .hero-list-container .list-tile.animate-up .module-background {
  transform: translate3d(0, 0%, 0) scale(1) !important;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="hero-list">
  <div class="hero-list-container">
    <div class="list-tile animate-up">
      <div class="module-background" style="background-image: url('https://thomasstorage1.blob.core.windows.net/wp-media/2017/11/tech-background.png');				background-size: cover;">
      </div>
    </div>

    <div class="list-tile">
      <div class="module-background" style="background-image: url('https://thomasstorage1.blob.core.windows.net/wp-media/2017/11/tech-background.png'); background-size: cover;">
      </div>
    </div>

    <div class="list-tile">
      <div class="module-background" style="background-image: url('https://thomasstorage1.blob.core.windows.net/wp-media/2017/11/tech-background.png');				background-size: cover;">
      </div>
    </div>

    <div class="list-tile">
      <div class="module-background" style="background-image: url('https://thomasstorage1.blob.core.windows.net/wp-media/2017/11/tech-background.png');				background-size: cover;">
      </div>
    </div>
  </div>
</div>