jquery - CSS 动画 - 请告诉我为什么案例 #1 有效,但案例 #2 无效
问题描述
动画 正在应用的动画是一个 CSS“模糊”,它应该在向下滚动时模糊元素,然后在向上滚动时将其重新聚焦。
示例 #1 - 有效! HTML 和 CSS 是相同的。jQuery 稍有不同,因为它针对的是父元素而不是子元素。(适用于 FF 和 Chrome)
示例 2 - 不起作用! HTML 和 CSS 是相同的。jQuery 稍有不同,因为它针对的是子元素而不是父元素。(适用于 FF 但不适用于 Chrome)
发生了什么? 在第一种情况下,jQuery 使用 BLUR 动画定位父级,并且正如预期的那样,在滚动时模糊和取消模糊。
怎么了? 在第二个示例中,除了以父代为目标之外,一切都是相同的,我想只模糊字母“S”而单独留下“T”。
如您所见,在第一种情况下工作的相同模糊样式类也适用于第二种情况。但是 - 当样式应用于第二种情况时,它们实际上并没有影响元素。没有模糊,没有边界(我添加用于测试)。
任何人都知道为什么这个动画会在父元素上工作,影响孩子,但在针对特定孩子时不起作用?
谢谢!
例 1(作品)
jQuery(document).ready(function($) {
// Smooth OUT
$('#smooth-logo').waypoint(function(direction) {
if (direction === 'down') {
$('#smooth-logo').addClass('swirl-in-fwd');
$('#smooth-logo').removeClass('swirl-in-bkw');
} else if (direction === 'up') {
$('#smooth-logo').addClass('swirl-in-bkw');
$('#smooth-logo').removeClass('swirl-in-fwd');
}
},
{ offset: '0%' });
});
.header {
min-height: 2000px;
position: relative;
}
#smooth-logo {
position: fixed;
}
/* SCROLLING ANIMATIONS */
.swirl-in-fwd {
animation: text-blur-out 1.2s cubic-bezier(0.550, 0.085, 0.680, 0.530) both;
border: 1px solid red;
}
.swirl-in-bkw {
animation: text-blur-in 1.2s cubic-bezier(0.550, 0.085, 0.680, 0.530) both;
border: 1px solid blue;
}
/* SCROLLING ANIMATIONS */
@keyframes text-blur-out {
0% {
-webkit-filter: blur(0.01);
filter: blur(0.01);
}
100% {
-webkit-filter: blur(12px) opacity(0%);
filter: blur(12px) opacity(0%);
}
}
@keyframes text-blur-in {
0% {
-webkit-filter: blur(12px) opacity(0%);
filter: blur(12px) opacity(0%);
}
100% {
-webkit-filter: blur(0.01);
filter: blur(0.01);
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/waypoints/4.0.1/jquery.waypoints.min.js"></script>
<script src="../custom.js"></script>
<link href="smooth.css" rel="stylesheet" type="text/css">
<header class="header">
<div id="smooth-logo">
<svg data-name="big-s" xmlns="http://www.w3.org/2000/svg" width="10in" height="2in" viewBox="0 0 2036.7197 612">
<title>Stable Smooth Logo</title>
<!-- BIG S -->
<path id="bigS" class="" d="M362.2168,367.2317c23.8106,16.6907,51.0516,32.82,83.83,32.82,32.1888,0,56.8072-10.392,56.8072-33.4934,0-22.7209-10.6044-34.0863-70.4407-43.93-59.8364-10.6044-89.757-33.7058-89.757-78.3966,0-46.9588,39.96-79.6635,99.4161-79.6635,36.6579,0,63.8458,7.9425,97.4489,28.7153l-18.0235,37.88c-33.9085-17.7179-47.9607-24.0272-78.4851-24.0272-30.6717,0-49.227,14.75-49.227,35.9591,0,19.3162,10.6044,28.7841,67.4117,38.6325,65.1385,10.98,93.5422,35.2179,93.5422,81.8012,0,49.6124-39.7691,83.9606-109.8293,83.9606-38.3944,0-79.8883-17.5373-102.94-38.04Z"/>
<!-- BIG T -->
<polygon id="bigS1" class="" points="682.881 444.996 682.881 215.385 581.132 215.385 602.355 171.38 842.615 171.38 821.253 215.385 731.83 215.385 731.83 444.996 682.881 444.996"/>
</svg>
</div>
</header>
示例 2(即使样式被应用于元素也不起作用)
jQuery(document).ready(function($) {
// Smooth OUT
$('#smooth-logo').waypoint(function(direction) {
if (direction === 'down') {
$('#bigS').addClass('swirl-in-fwd');
$('#bigS').removeClass('swirl-in-bkw');
} else if (direction === 'up') {
$('#bigS').addClass('swirl-in-bkw');
$('#bigS').removeClass('swirl-in-fwd');
}
},
{ offset: '0%' });
});
.header {
min-height: 2000px;
position: relative;
}
#smooth-logo {
position: fixed;
}
/* SCROLLING ANIMATIONS */
.swirl-in-fwd {
animation: text-blur-out 1.2s cubic-bezier(0.550, 0.085, 0.680, 0.530) both;
border: 1px solid red;
}
.swirl-in-bkw {
animation: text-blur-in 1.2s cubic-bezier(0.550, 0.085, 0.680, 0.530) both;
border: 1px solid blue;
}
/* SCROLLING ANIMATIONS */
@keyframes text-blur-out {
0% {
-webkit-filter: blur(0.01);
filter: blur(0.01);
}
100% {
-webkit-filter: blur(12px) opacity(0%);
filter: blur(12px) opacity(0%);
}
}
@keyframes text-blur-in {
0% {
-webkit-filter: blur(12px) opacity(0%);
filter: blur(12px) opacity(0%);
}
100% {
-webkit-filter: blur(0.01);
filter: blur(0.01);
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/waypoints/4.0.1/jquery.waypoints.min.js"></script>
<script src="../custom.js"></script>
<link href="smooth.css" rel="stylesheet" type="text/css">
<header class="header">
<div id="smooth-logo">
<svg data-name="big-s" xmlns="http://www.w3.org/2000/svg" width="10in" height="2in" viewBox="0 0 2036.7197 612">
<title>Stable Smooth Logo</title>
<!-- BIG S -->
<path id="bigS" class="" d="M362.2168,367.2317c23.8106,16.6907,51.0516,32.82,83.83,32.82,32.1888,0,56.8072-10.392,56.8072-33.4934,0-22.7209-10.6044-34.0863-70.4407-43.93-59.8364-10.6044-89.757-33.7058-89.757-78.3966,0-46.9588,39.96-79.6635,99.4161-79.6635,36.6579,0,63.8458,7.9425,97.4489,28.7153l-18.0235,37.88c-33.9085-17.7179-47.9607-24.0272-78.4851-24.0272-30.6717,0-49.227,14.75-49.227,35.9591,0,19.3162,10.6044,28.7841,67.4117,38.6325,65.1385,10.98,93.5422,35.2179,93.5422,81.8012,0,49.6124-39.7691,83.9606-109.8293,83.9606-38.3944,0-79.8883-17.5373-102.94-38.04Z"/>
<!-- BIG T -->
<polygon id="bigS1" class="" points="682.881 444.996 682.881 215.385 581.132 215.385 602.355 171.38 842.615 171.38 821.253 215.385 731.83 215.385 731.83 444.996 682.881 444.996"/>
</svg>
</div>
</header>
解决方案
不同之处在于,在第一个示例中,您将 CSS 过滤器函数应用于 HTML 元素。在第二个中,您将 CSS 过滤器功能应用于 SVG子元素。并非所有浏览器都支持在 SVG 元素上使用过滤器功能。
解决方法是改用 SVG 过滤器和动画。
请注意,SVG 动画在 IE/Edge 中不起作用。因此,您可能需要为此使用 polyfill。见https://leunen.me/fakesmile/
jQuery(document).ready(function($) {
// Smooth OUT
$('#smooth-logo').waypoint(function(direction) {
if (direction === 'down') {
$('#bigS').addClass('swirl-in-fwd');
$('#bigS').removeClass('swirl-in-bkw');
$('#animOut').get(0).beginElement(); // restart the animation
} else if (direction === 'up') {
$('#bigS').addClass('swirl-in-bkw');
$('#bigS').removeClass('swirl-in-fwd');
$('#animIn').get(0).beginElement(); // restart the animation
}
},
{ offset: '0%' });
});
.header {
min-height: 2000px;
position: relative;
}
#smooth-logo {
position: fixed;
}
/* SCROLLING ANIMATIONS */
.swirl-in-fwd {
filter: url(#filt-blur-out);
}
.swirl-in-bkw {
filter: url(#filt-blur-in);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/waypoints/4.0.1/jquery.waypoints.min.js"></script>
<script src="../custom.js"></script>
<link href="smooth.css" rel="stylesheet" type="text/css">
<header class="header">
<div id="smooth-logo">
<svg data-name="big-s" xmlns="http://www.w3.org/2000/svg" width="10in" height="2in" viewBox="0 0 2036.7197 612">
<title>Stable Smooth Logo</title>
<defs>
<filter id="filt-blur-out" x="-50%" y="-50%" width="200%" height="200%">
<feGaussianBlur in="SourceGraphic" stdDeviation="0" result="blurpart">
<animate id="animOut"
attributeName="stdDeviation" from="0" to="50" dur="1.2s" fill="freeze" begin="indefinite"
calcMode="spline" keyTimes="0; 1" keySplines="0.550 0.085 0.680 0.530"/>
</feGaussianBlur>
<feFlood flood-color="white" flood-opacity="1" result="alphapart">
<animate attributeName="flood-opacity" from="1" to="0" dur="1.2s" fill="freeze" begin="animOut.begin"
calcMode="spline" keyTimes="0; 1" keySplines="0.550 0.085 0.680 0.530"/>
</feFlood>
<feComposite in="blurpart" in2="alphapart" operator="in"/>
</filter>
<filter id="filt-blur-in" x="-50%" y="-50%" width="200%" height="200%">
<feGaussianBlur in="SourceGraphic" stdDeviation="50" result="blurpart">
<animate id="animIn"
attributeName="stdDeviation" from="50" to="0" dur="1.2s" fill="freeze" begin="indefinite"
calcMode="spline" keyTimes="0; 1" keySplines="0.550 0.085 0.680 0.530"/>
</feGaussianBlur>
<feFlood flood-color="white" flood-opacity="0" result="alphapart">
<animate attributeName="flood-opacity" from="0" to="1" dur="1.2s" fill="freeze" begin="animIn.begin"
calcMode="spline" keyTimes="0; 1" keySplines="0.550 0.085 0.680 0.530"/>
</feFlood>
<feComposite in="blurpart" in2="alphapart" operator="in"/>
</filter>
</defs>
<!-- BIG S -->
<path id="bigS" class="" d="M362.2168,367.2317c23.8106,16.6907,51.0516,32.82,83.83,32.82,32.1888,0,56.8072-10.392,56.8072-33.4934,0-22.7209-10.6044-34.0863-70.4407-43.93-59.8364-10.6044-89.757-33.7058-89.757-78.3966,0-46.9588,39.96-79.6635,99.4161-79.6635,36.6579,0,63.8458,7.9425,97.4489,28.7153l-18.0235,37.88c-33.9085-17.7179-47.9607-24.0272-78.4851-24.0272-30.6717,0-49.227,14.75-49.227,35.9591,0,19.3162,10.6044,28.7841,67.4117,38.6325,65.1385,10.98,93.5422,35.2179,93.5422,81.8012,0,49.6124-39.7691,83.9606-109.8293,83.9606-38.3944,0-79.8883-17.5373-102.94-38.04Z"/>
<!-- BIG T -->
<polygon id="bigS1" class="" points="682.881 444.996 682.881 215.385 581.132 215.385 602.355 171.38 842.615 171.38 821.253 215.385 731.83 215.385 731.83 444.996 682.881 444.996"/>
</svg>
</div>
</header>
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