svg在视口中时触发动画
我的页面有一个大标题图片和一个svg动画。 这是一个例子：
html, body {
height: 100%;
margin: 0
}
.header-image {
height: 100%;
background-color: #ffcc00
}
/*Line animations*/
.line {
stroke-dasharray: 150;
stroke-dashoffset: 150;
animation: dash 2s cubic-bezier(0.23, 1, 0.32, 1);;
-webkit-animation: dash 2s cubic-bezier(0.23, 1, 0.32, 1);;
-webkit-animation-fill-mode: forwards;
}
#line01, #line02 {
animation-delay:1s;
-webkit-animation-delay:1s;
}
#line03, #line04 {
animation-delay:1.2s;
-webkit-animation-delay:1.2s;
}
#line05, #line06 {
animation-delay:1.6s;
-webkit-animation-delay:1.6s;
}
#line07, #line08 {
animation-delay:1.9s;
-webkit-animation-delay:1.9s;
}
#line09, #line10 {
animation-delay:2.3s;
-webkit-animation-delay:2.3s;
}
#line11,
#line12,
#line13,
#line14,
#line15,
#line16,
#line17,
#line18{
animation-delay:3.1s;
-webkit-animation-delay:3.1s;
}
#line19,
#line20,
#line21,
#line22,
#line23,
#line24,
#line25,
#line26{
animation-delay:3.5s;
-webkit-animation-delay:3.5s;
}
/*Keyframes*/
@keyframes dash {
0% {stroke-dashoffset: 150;}
100% {stroke-dashoffset: 0;}
}
@-webkit-keyframes dash {
0% {stroke-dashoffset: 150;}
100% {stroke-dashoffset: 0;}
}<div class="header-image">Please scroll down</div>
<div class="svg-animation">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" id="guida" x="0px" y="0px" viewBox="0 0 480.669 305.346" enable-background="new 0 0 480.669 305.346" xml:space="preserve">
<rect id="ombra-carta01" x="52.2" y="31.8" transform="matrix(-0.9026 0.4305 -0.4305 -0.9026 331.4025 234.5817)" fill="#A2DEF1" width="174" height="246.1"/>
<path id="ombra-occhiali" fill="#A2DEF1" d="M406.66 105.7 c-4.273-0.759-20.888-8.967-33.1-12.474c-12.225-3.512-30.973-5.673-34.362-5.288c-4.051 0.459-4.223 0.747-4.973 3.6 c-0.75 2.86-0.772 5.4 1.3 6.642c2.683 1.5 2.2 5 1.9 14.967c-2.108 4.115-3.231 8.417-3.774 11.1 c-1.042 5.2 3.5 8.4 6.4 3.745c2.822 4.8 8.4 8.9 19 11.889c18.588 5.2 27.35-5.681 30.177-9.188 c5.041-6.253 5.85-16.103 15.383-14.193c9.534 1.9 6.7 11.2 8.9 18.887c1.259 4.3 4.9 17.9 24.1 20.2 c10.921 1.3 17.632-0.292 22.104-3.697c0.914 5.5 6.3 4.3 7.35-0.96c0.546-2.726 1.171-7.168 0.795-11.811 c3.57-9.194 4.472-12.6 7.528-12.981c2.4-0.299 3.373-2.688 3.782-5.617c0.41-2.93 0.362-3.263-3.2-5.246 c-2.979-1.66-21.113-6.885-33.747-8.354C430.991 105.7 416.7 107.5 406.7 105.694z"/>
<path id="fine-asta-dx" fill="#254659" d="M333.111 84.4 c23.972 4.3 106.6 28 118.9 33.554c12.3 5.5 10.6 21.7 9.3 28.158c-1.297 6.473-9.299 6.76-7.104-4.195 c2.193-10.955 2.428-17.082-5.075-19.285c-7.504-2.203-109.515-28.483-116.636-30.113C325.357 90.9 328.4 83.2 333.1 84.4 z"/>
<path id="fine-asta-sx" fill="#254659" d="M469.952 111.8 c-23.768-5.291-109.196-15.194-122.675-14.834c-13.479 0.359-18.091 15.947-19.387 22.421s5.978 9.8 8.172-1.136 c2.194-10.955 4.337-16.699 12.11-15.843c7.773 0.9 112 15.9 119.2 17.127C474.609 120.8 474.8 112.5 470 111.8 z"/>
<path id="montatura" d="M435.583 151.139c16.586 1.1 22.116-5.72 25.721-14.82 c4.24-10.709 5.044-14.575 8.313-14.983c2.399-0.299 3.372-2.688 3.782-5.617c0.409-2.93 0.362-3.263-3.201-5.246 c-2.979-1.66-21.113-6.885-33.747-8.354c-0.287-0.033-0.577-0.063-0.868-0.093v3.04c10.722 1.3 21.4 4.6 24 7 c5.566 5 0.8 22.641-5.935 30.514c-3.718 4.371-10.928 6.027-18.09 5.686V151.139z M400.826 100.8 c-4.274-0.759-20.888-8.967-33.101-12.475c-1.937-0.556-4.037-1.078-6.215-1.562v3.164c10.889 2.3 22.7 6.8 25.8 13.1 c4.493 9.401-9.373 27.347-19.625 29.896c-1.816 0.452-3.909 0.615-6.135 0.52v2.915c12.997 0.5 19.536-7.608 21.905-10.548 c5.042-6.253 5.85-16.103 15.384-14.193c9.533 1.9 6.7 11.2 8.9 18.887c1.258 4.3 4.9 17.9 24.1 20.2 c1.308 0.2 2.6 0.3 3.7 0.354v-2.87c-6.226-0.296-12.414-2.102-16.24-4.946c-8.479-6.302-14.364-28.202-6.597-35.148 c4.281-3.828 13.587-4.225 22.837-3.108v-3.04C424.432 100.9 410.6 102.6 400.8 100.828z M361.51 86.8 c-11.565-2.569-25.294-4.049-28.147-3.726c-4.051 0.459-4.223 0.747-4.973 3.608c-0.75 2.86-0.772 5.4 1.3 6.6 c2.86 1.6 2.1 5.5 1.9 17.028c-0.191 10.5 2.7 19.4 21.6 24.697c3.01 0.8 5.8 1.3 8.3 1.36v-2.915 c-9.958-0.431-22.591-6.071-25.262-14.423c-3.147-9.843-0.785-27.983 6.275-30.445c2.736-0.953 10.573-0.455 19 1.337V86.792z"/>
<path id="riflesso-bottom" fill="#B0CAD9" d="M342.523 88.6 c6.276-2.188 39.4 3.3 44.7 14.452c4.493 9.401-9.373 27.347-19.625 29.896c-9.948 2.477-28.129-3.686-31.396-13.903 C333.102 109.2 335.5 91.1 342.5 88.619L342.523 88.619z M459.608 112.069c-4.949-4.436-37.619-12.161-46.861-3.896 c-7.768 6.946-1.882 28.8 6.6 35.148c8.228 6.1 27.4 7.4 34.33-0.739C460.369 134.7 465.2 117.1 459.6 112.069z"/>
<path id="riflesso-top-sx" fill="#D1E2EB" d="M345.894 88.2 c10.529-0.32 36.7 5.1 41.4 14.913c3.151 6.594-2.729 17.39-10.059 24.13L345.894 88.158z"/>
<path id="riflesso-top-dx" fill="#D1E2EB" d="M418.783 105.355l31.898 39.8 c1.146-0.716 2.158-1.559 2.992-2.539c6.695-7.873 11.501-25.523 5.935-30.514C455.452 108.3 431.7 102.3 418.8 105.355z"/>
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<path id="riflesso-aste-top-dx" fill="#8097A6" d="M452.192 108.6 c-8.324-1.297-18.175-2.673-28.473-4.008c-1.761 0.126-3.422 0.358-4.937 0.716l9.427 11.751c10.996 2.9 19 5 20.9 5.5 c7.503 2.2 7.3 8.3 5.1 19.285l-0.005 0.024c2.821-3.578 5.257-8.839 6.642-14.028c-1.398-4.124-4.051-7.831-8.789-9.959 c-0.717-0.322-1.673-0.705-2.843-1.144c5.22 0.8 9.6 1.4 12.8 1.898c-0.122-2.879-0.866-5.261-2.421-6.654 C458.445 111 455.8 109.8 452.2 108.647z"/>
<rect id="carta01" x="46.3" y="26.9" transform="matrix(-0.9026 0.4305 -0.4305 -0.9026 318.206 227.8356)" fill="#FFFFFF" width="174" height="246.1"/>
<line class="line" id="line26" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="182.6" y1="239.7" x2="224" y2="220"/>
<line class="line" id="line25" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="179.3" y1="232.8" x2="238.6" y2="204.6"/>
<line class="line" id="line24" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="176.1" y1="226" x2="235.3" y2="197.7"/>
<line class="line" id="line23" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="172.8" y1="219.1" x2="232.1" y2="190.9"/>
<line class="line" id="line22" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="169.5" y1="212.2" x2="228.8" y2="184"/>
<line class="line" id="line21" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="166.2" y1="205.4" x2="225.6" y2="177.2"/>
<line class="line" id="line20" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="163" y1="198.5" x2="222.3" y2="170.3"/>
<line class="line" id="line19" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="159.7" y1="191.7" x2="219" y2="163.4"/>
<line class="line" id="line18" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="113.7" y1="272.5" x2="142.6" y2="258.7"/>
<line class="line" id="line17" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="110.4" y1="265.6" x2="168.8" y2="237.8"/>
<line class="line" id="line16" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="107.1" y1="258.8" x2="165.5" y2="231"/>
<line class="line" id="line15" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="103.9" y1="251.9" x2="162.3" y2="224.1"/>
<line class="line" id="line14" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="100.6" y1="245" x2="159" y2="217.3"/>
<line class="line" id="line13" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="97.3" y1="238.2" x2="155.7" y2="210.4"/>
<line class="line" id="line12" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="94.1" y1="231.3" x2="152.4" y2="203.5"/>
<line class="line" id="line11" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="90.8" y1="224.5" x2="149.2" y2="196.7"/>
<line class="line" id="line10" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="62.5" y1="166.6" x2="118.3" y2="140.1"/>
<line class="line" id="line09" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="59.3" y1="159.7" x2="187.5" y2="98.7"/>
<line class="line" id="line08" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="56" y1="152.9" x2="184.2" y2="91.8"/>
<line class="line" id="line07" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="52.7" y1="146" x2="181" y2="85"/>
<line class="line" id="line06" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="49.5" y1="139.1" x2="177.7" y2="78.1"/>
<line class="line" id="line05" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="46.2" y1="132.3" x2="174.4" y2="71.3"/>
<line class="line" id="line04" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="42.9" y1="125.4" x2="171.2" y2="64.4"/>
<line class="line" id="line03" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="39.7" y1="118.6" x2="167.9" y2="57.5"/>
<line class="line" id="line02" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="36.4" y1="111.7" x2="164.6" y2="50.7"/>
<line class="line" id="line01" fill="none" stroke="#CCCCCC" stroke-width="4.5" x1="54.4" y1="82.6" x2="130.7" y2="46.3"/>
</svg>
</div>
http://jsfiddle.net/qx7p46f3/4/
当用户向下滚动时，动画已经播放，因为它会在页面加载后立即启动。我希望在svg位于视口中时触发它，而不是当用户滚动到页面的特定部分时。我怎么能这样做？
我不太了解js，但我不想使用jquery，因为在这种情况下它似乎不是最有效的解决方案，如果我错了，请纠正我
答案 0 :(得分：2)
如果您对javascript了解不多，那么您可能需要考虑使用jQuery，因为您可以更轻松地完成所需的效果。
使用像jQuery.onScreen这样的插件，你可以简单地写一下：
$('svg').onScreen({
container: window,
direction: 'vertical',
toggleClass: 'onScreen',
});
在你的CSS中：
.onScreen .line {
animation: dash 2s cubic-bezier(0.23, 1, 0.32, 1);;
-webkit-animation: dash 2s cubic-bezier(0.23, 1, 0.32, 1);;
-webkit-animation-fill-mode: forwards;
}
修改 没有jQuery：
var wrapper = document.querySelector('.svg-animation');
window.onscroll = function (event) {
if (wrapper.getBoundingClientRect().top < 0) {
wrapper.className = "svg-animation onScreen";
window.onscroll = null;
}
}
请注意，这还没有在所有浏览器中测试过，我无法保证完全支持。 这是一个有效的演示：http://codepen.io/btpoe/pen/caeb32b678521d82144ae1f953c3e332