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社区首页 >问答首页 >内容淡入，然后是动画(flipInX)

问内容淡入，然后是动画(flipInX)
EN

Stack Overflow用户
提问于 2016-02-24 02:49:15
回答 2查看 1.6K关注 0票数 4

当我的页面加载时，将显示视图端口中的内容(视图中未显示的内容是容器上的hidden类)，并执行动画(flipInX)。然后，当用户向下滚动页面时，hidden类被从容器中移除，内容淡出(使用fadeIn())到页面上，然后进行动画。

我的问题是，它正在淡出(fadeIn())到页面上，执行动画，然后再次执行fadeIn()。

编辑:我在一些浏览器(火狐浏览器和Chrome浏览器)上找到的，它在结束时做了额外的“反弹”，而不是第二次衰退(Safari)

JSFiddle

HTML

代码语言：javascript
复制
<body class="homepage">
  <main id="main" class="main" role="main" tabindex="-1">
    <div class="main-3">
      <article class="post flipInX animated" data-delay="2">
        <h1 class="h-1">Service 1</h1>
        <div class="entry">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas vestibulum, lectus id sollicitudin mattis, quam tortor lobortis orci, sed iaculis mi nulla non ipsum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Donec non felis mollis, congue neque eu, rhoncus libero. Nunc ut mattis ante.</div>
      </article>
      <article class="post flipInX animated" data-delay="4">
        <h1 class="h-1">Service 2</h1>
        <div class="entry">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas vestibulum, lectus id sollicitudin mattis, quam tortor lobortis orci, sed iaculis mi nulla non ipsum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Donec non felis mollis, congue neque eu, rhoncus libero. Nunc ut mattis ante.</div>
      </article>
      <article class="post flipInX animated" data-delay="6">
        <h1 class="h-1">Service 3</h1>
        <div class="entry">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas vestibulum, lectus id sollicitudin mattis, quam tortor lobortis orci, sed iaculis mi nulla non ipsum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Donec non felis mollis, congue neque eu, rhoncus libero. Nunc ut mattis ante.</div>
      </article>
      <article class="post flipInX animated" data-delay="8">
        <h1 class="h-1">Service 4</h1>
        <div class="entry">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas vestibulum, lectus id sollicitudin mattis, quam tortor lobortis orci, sed iaculis mi nulla non ipsum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Donec non felis mollis, congue neque eu, rhoncus libero. Nunc ut mattis ante.</div>
      </article>
      <article class="post flipInX animated" data-delay="10">
        <h1 class="h-1">Service 5</h1>
        <div class="entry">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas vestibulum, lectus id sollicitudin mattis, quam tortor lobortis orci, sed iaculis mi nulla non ipsum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Donec non felis mollis, congue neque eu, rhoncus libero. Nunc ut mattis ante.</div>
      </article>
      <article class="post flipInX animated" data-delay="12">
        <h1 class="h-1">Service 6</h1>
        <div class="entry">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas vestibulum, lectus id sollicitudin mattis, quam tortor lobortis orci, sed iaculis mi nulla non ipsum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Donec non felis mollis, congue neque eu, rhoncus libero. Nunc ut mattis ante.</div>
      </article>
    </div>
  </main>
</body>

CSS

代码语言：javascript
复制
* {
  border: 0;
  margin: 0;
  padding: 0;
  -webkit-appearance: none;
  -webkit-border-radius: 0;
}
*,
*:before,
*:after {
  box-sizing: border-box;
}
.hidden {
  visibility: hidden;
}
.main {
  position: relative;
  display: inline-block;
  height: auto;
  width: 98%;
  margin: 40px auto 0 auto;
  text-align: left;
}
.main.minify {
  margin-top: 150px;
}
.main-3 {
  min-height: 400px;
  font-size: 16px;
  line-height: 24px;
}
[class|=h] {
  margin-bottom: 42px;
  font-size: 30px;
  font-weight: normal;
  line-height: 1;
}
.animated {
  -webkit-animation-duration: 1s;
  animation-duration: 1s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both
}
.animated.bounceIn,
.animated.bounceOut,
.animated.flipOutX,
.animated.flipOutY {
  -webkit-animation-duration: .75s;
  animation-duration: .75s
}
@-webkit-keyframes flipInX {
  0% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
    transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
    -webkit-animation-timing-function: ease-in;
    animation-timing-function: ease-in;
    opacity: 0
  }
  40% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
    transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
    -webkit-animation-timing-function: ease-in;
    animation-timing-function: ease-in
  }
  60% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
    transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
    opacity: 1
  }
  80% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, -5deg);
    transform: perspective(400px) rotate3d(1, 0, 0, -5deg)
  }
  100% {
    -webkit-transform: perspective(400px);
    transform: perspective(400px)
  }
}
@keyframes flipInX {
  0% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
    transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
    -webkit-animation-timing-function: ease-in;
    animation-timing-function: ease-in;
    opacity: 0
  }
  40% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
    transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
    -webkit-animation-timing-function: ease-in;
    animation-timing-function: ease-in
  }
  60% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
    transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
    opacity: 1
  }
  80% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, -5deg);
    transform: perspective(400px) rotate3d(1, 0, 0, -5deg)
  }
  100% {
    -webkit-transform: perspective(400px);
    transform: perspective(400px)
  }
}
.flipInX {
  -webkit-backface-visibility: visible !important;
  backface-visibility: visible !important;
  -webkit-animation-name: flipInX;
  animation-name: flipInX
}
.homepage .main-3 {
  width: 80%;
  margin: 0 auto;
  text-align: center;
}
.homepage .post {
  display: inline-block;
  width: 49%;
  margin-bottom: 40px;
  vertical-align: top;
  -webkit-text-stroke: 0.5px;
}
.homepage .post .h-1 {
  font-size: 26px;
  line-height: 110%;
  margin: 14px 0 10px;
  text-align: center;
}
.homepage .post .entry {
  padding: 0 10%
}

JS

代码语言：javascript
复制
function isScrolledIntoView(elem) {
  var docViewTop = $(window).scrollTop();
  var docViewBottom = docViewTop + $(window).height();

  var elemTop = $(elem).offset().top;
  var elemBottom = elemTop + $(elem).height();

  return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}
$(document).ready(function() {
  $('.post').each(function(index) {
    var delay = $(this).attr('data-delay');
    if (typeof delay !== typeof undefined && delay !== false) {
      $(this).css('animation', 'flipInX 2s .' + delay + 's');
      $(this).css('-webkit-animation', 'flipInX 2s .' + delay + 's');
    }
  });
  $('.post').not('.post:first').each(function() {
    if (!isScrolledIntoView($(this))) {
      $(this).addClass('hidden');
    }
  });
  $(document).on('scroll', function() {
    $('.post.hidden').each(function() {
      if (isScrolledIntoView($(this))) {
        $(this).removeClass('hidden').css({
          'display': 'none'
        }).fadeIn();
      }
    });
  });
});
javascript
jquery
css
animation
EN

回答 2

Stack Overflow用户

回答已采纳

发布于 2016-03-03 21:28:03

您所描述的视觉结果(淡入，然后是动画)可以通过只使用关键帧动画而不依赖jQuery的fadeIn来更好地完成。

我改变了一堆东西，想出了一个很自然的动画。虽然这可能不是您所期望的，但是您可以使用它作为一个基础，以便更接近您想要的结果(同时使用更少的代码)。

--这是我改进/修改的：

  • 用更可靠的方法替换了检测可见元素的函数。(参考资料见下文)
  • 使用css animation-state属性和一些javascript来控制每个动画的初始状态和播放。
  • 现在将延迟分配给每个滚动框中以前隐藏的元素。
  • 对于第一部分中的淡出，我利用了flipInX中现有的关键帧。在那里您可以调整opacity值以获得更好的结果。
  • 将一些动画参数从javascript移出CSS。(如animation-duration)
  • 当flipInX动画结束时，元素将使用animation-fill-mode: forwards停留在最后一个帧上。

参考资料来源：

您可以在下面的小提琴中看到结果：https://jsfiddle.net/wazaraki/czwrgqdq/

带有注释的新代码(更新)：

​

代码语言：javascript
复制
$(function() {
  /** Reccomended technique for detecting visible elements 
      take from https://stackoverflow.com/a/7557433/4405615 
      Removed width detection since we only need the heights */
  function isScrolledIntoView (el) {

    //special bonus for those using jQuery
    if (typeof jQuery === "function" && el instanceof jQuery) {
        el = el[0];
    }

    var rect = el.getBoundingClientRect();

    return (
        rect.top >= 0 &&
        rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) /*or $(window).height() */
    );
}
/* Not longer needed as we now assign delays dinamically on scroll (see below) */
/*  $('.post').each(function(index) {
    var delay = $(this).data('delay');
    if (typeof delay !== typeof undefined && delay !== false) {
      //$(this).css('animation-delay', delay + 's');
      //$(this).css('-webkit-animation-delay', delay + 's');
    }
  });*/
  
  var delay = 0;
  $('.post').each(function() {
    var post = $(this);
    if (isScrolledIntoView(post)) {
      /* start animation for visible elements 
         see the CSS for more info */
      post.css({
          '-webkit-animation-delay': delay + 's',
        	'animation-delay': delay + 's',
        	'webkit-animation-play-state': 'running',
        	'animation-play-state': 'running'
         });
      delay += 0.2;
    } else {
      post.addClass('hidden');
    }
  });
  $(document).on('scroll', function() {
    /** every round starts with 0s delay so following scrolls 
        can start animating immediately */
    var delay = 0;
    $('.post.hidden').each(function() {
      if (isScrolledIntoView(this)) {
        $(this).removeClass('hidden').css({
          '-webkit-animation-delay': delay + 's',
        	'animation-delay': delay + 's',
        	'webkit-animation-play-state': 'running',
        	'animation-play-state': 'running'
         });
        delay += 0.2;
      }
    });
  });
});
代码语言：javascript
复制
* {
  border: 0;
  margin: 0;
  padding: 0;
  -webkit-appearance: none;
  -webkit-border-radius: 0;
}

*,
*:before,
*:after {
  box-sizing: border-box;
}

/** this class doesn't really do anything, just used it for
    marking invisible elements. You could use data
    attributes instead, for example */
.hidden {}

.main {
  position: relative;
  display: inline-block;
  height: auto;
  width: 98%;
  margin: 40px auto 0 auto;
  text-align: left;
}

.main-3 {
  min-height: 400px;
  font-size: 16px;
  line-height: 24px;
}

[class|=h] {
  margin-bottom: 42px;
  font-size: 30px;
  font-weight: normal;
  line-height: 1;
}

.animated {
  -webkit-animation-duration: 1s;
  animation-duration: 1s;
  /** once the animation finishes we stay on the last
      keyframe */
  -webkit-animation-fill-mode: forwards;
  animation-fill-mode: forwards;
}

@-webkit-keyframes flipInX {
  0% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
    transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
    -webkit-animation-timing-function: ease-in;
    animation-timing-function: ease-in;
    opacity: 0;
  }
  40% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
    transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
    -webkit-animation-timing-function: ease-in;
    animation-timing-function: ease-in
  }
  60% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
    transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
    opacity: 1;
  }
  80% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, -5deg);
    transform: perspective(400px) rotate3d(1, 0, 0, -5deg);
  }
  100% {
    -webkit-transform: perspective(400px);
    transform: perspective(400px);
    opacity: 1;
  }
}

@keyframes flipInX {
  0% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
    transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
    -webkit-animation-timing-function: ease-in;
    animation-timing-function: ease-in;
    opacity: 0;
  }
  40% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
    transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
    -webkit-animation-timing-function: ease-in;
    animation-timing-function: ease-in;
  }
  60% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
    transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
    opacity: 1;
  }
  80% {
    -webkit-transform: perspective(400px) rotate3d(1, 0, 0, -5deg);
    transform: perspective(400px) rotate3d(1, 0, 0, -5deg);
  }
  100% {
    -webkit-transform: perspective(400px);
    transform: perspective(400px);
    opacity: 1;
  }
}

.flipInX {
  -webkit-backface-visibility: visible !important;
  backface-visibility: visible !important;
  -webkit-animation-name: flipInX;
  animation-name: flipInX;
  -webkit-animation-duration: 2s;
  animation-duration: 2s;
  /* this is a nice way to control animation playback */
  -webkit-animation-play-state: paused;
  animation-play-state: paused;
}

.homepage .main-3 {
  width: 80%;
  margin: 0 auto;
  text-align: center;
}

.homepage .post {
  display: inline-block;
  width: 49%;
  margin-bottom: 40px;
  vertical-align: top;
  -webkit-text-stroke: 0.5px;
  opacity: 0;
}

.homepage .post .h-1 {
  font-size: 26px;
  line-height: 110%;
  margin: 14px 0 10px;
  text-align: center;
}

.homepage .post .entry {
  padding: 0 10%
}

​

票数 3
EN

Stack Overflow用户

发布于 2016-03-02 10:42:07

flipInX动画也是动画元素的opacity在0%到60%之间。尝试删除动画中对opacity的引用。

票数 -1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/35592335

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