我正在尝试在 SVG 中的分组路径中应用阴影，就像 css 中的框阴影一样，尝试只应用类 box-shadow: 2px 2px 13px 0 var(rgba(0 , 0, 0, 0.3)); 悬停但不起作用，还尝试了一个过滤器，例如:
<filter id="dropshadow" x="-2" y="-2" width="300" height="300">
<feGaussianBlur stdDeviation="1"/>
</filter>
然后在悬停时将过滤器添加到路径但仍然不起作用
filter: url('#dropshadow');
关于如何实现这一点有什么想法吗？这是 jsfiddle
编辑:已经能够创建一个我可以使用它显示的阴影:
<filter id="selective-shadow">
<feColorMatrix type="matrix" values="0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
2 0 0 0 -1"/>
<feGaussianBlur stdDeviation="3"/>
<feOffset dy="0" dx="0"/>
<feMerge>
<feMergeNode/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
现在在我的 CSS 上，我尝试同时使用我的悬停效果和阴影效果，但它不起作用:
path {
fill: #e5e5e5;
}
path:hover {
stroke: #f4f6f9;
stroke-width:2px;
stroke-linejoin: round;
fill: #f4f6f9;
cursor: pointer;
}
path:hover:before {
content: "";
filter: url('#selective-shadow');
}
最佳答案
为了在悬停时创建阴影，我添加了@Erik Dahlström 开发的滤镜:http://xn--dahlstrm-t4a.net/svg/filters/arrow-with-dropshadow.svg
为了能够将代码放在片段中，我只添加了几个状态。
var svg = document.querySelector("svg");
var paths = document.querySelectorAll("path.state");
var i = paths.length;
while(i--) {
paths[i].addEventListener("mouseover", function(e) {
svg.appendChild(e.target);
});
}.state {
fill:white;
stroke:dodgerblue;
transform-origin: center center;
transform-box: fill-box;
transition: 1s;
}
:hover.state {
fill:blue;
stroke:white;
stroke-width:2px;
filter:url(#dropshadow);
-webkit-transform: scale(1.5);
transform: scale(1.5);
}<body>
<section id="map">
<svg version="1.1"
id="svg2" xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="467 -284 959 593" xml:space="preserve">
<defs>
<filter id="dropshadow" height="130%">
<feGaussianBlur in="SourceAlpha" stdDeviation="3"/>
<feOffset dx="2" dy="2" result="offsetblur"/>
<feMerge>
<feMergeNode/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
<g>
<title>"ID" - IDAHO
State capital city - Boise
Population - 228,790
</title>
<path id="ID" class="state" d="
M615.5-107.5l8.8-35.2l1.4-4.2l2.5-5.9l-1.3-2.3l-2.5,0.1l-0.8-1l0.5-1.1l0.3-3.1l4.5-5.5l1.8-0.5l1.1-1.1l0.6-3.2l0.9-0.7l3.9-5.8
l3.9-4.3l0.2-3.8l-3.4-2.6l-1.5-4.4l13.6-63.3l13.5,2.5l-4.4,21.4l3.6,7.5l-1.6,4.7l2,4.6l3.1,1.3l3.8,9.6l3.5,4.4l0.5,1.1l3.3,1.1
l0.4,2.1l-7,17.4l-0.2,2.6l2.6,3.3l0.9,0l4.9-3l0.7-1.1l1.6,0.7l-0.3,5.4l2.7,12.6l3.9,3.2l1.7,2.2l-0.7,4.1l1.1,2.8l1.1,1.1
l2.5-2.4l2.8,0l2.9,1.3l2.8-0.7l3.8-0.2l4,1.6l2.7-0.3l0.5-3l2.9-0.8l1.3,1.5l0.4,2.9l1.4,1.2l-8.4,53.6
C710.4-89.3,622.5-106,615.5-107.5z"/>
</g>
<g>
<title> "UT" - Utah
State capital city - Salt Lake City
Population
City 186,440
Estimate Estimate (2018) 200,591
</title>
<path id="UT" class="state" d="M726.5,26.1l-83.7-11.9
l20.6-112.5l46.8,8.7l-1.5,10.6l-2.3,13.2l7.8,0.9l16.4,1.8l8.2,0.9L726.5,26.1z"/>
</g>
<g>
<title> "AZ" - Arizona
State capital city - Phoenix
Population
City 1,445,632
Estimate Estimate (2018) 1,660,272
</title>
<path id="AZ" class="state" d="
M611.9,98.6l-2.6,2.2l-0.3,1.5l0.5,1l18.9,10.7l12.1,7.6l14.7,8.6l16.8,10l12.3,2.4l25,2.7l17.3-119.1l-83.7-11.9l-3.1,16.4l-1.6,0
l-1.7,2.6l-2.5-0.1l-1.3-2.7l-2.7-0.3l-0.9-1.1H628l-0.9,0.6l-1.9,1l-0.1,7l-0.2,1.7l-0.6,12.6l-1.5,2.2l-0.6,3.3l2.7,4.9l1.3,5.8
l0.8,1l1,0.6l-0.1,2.3l-1.6,1.4l-3.4,1.7l-1.9,1.9l-1.5,3.7l-0.6,4.9l-2.9,2.7l-2.1,0.7l0.1,0.8l-0.5,1.7l0.5,0.8l3.7,0.6l-0.6,2.7
l-1.5,2.2L611.9,98.6z"/>
</g>
<g>
<title> "NV" - Nevada
State capital city - Carson City
Population
City 55,274
Estimate Estimate (2018) 55,414
</title>
<path id="NV" class="state" d="M663.4-98.4
L639.8,30.4l-1.8,0.3l-1.6,2.4l-2.4,0l-1.5-2.7l-2.6-0.4l-0.8-1.1l-1-0.1l-2.8,1.6l-0.3,6.8l-0.4,5.8l-0.3,8.6l-1.4,2.1l-2.4-1.1
L551.3-51.5l19-67.6L663.4-98.4z"/>
</g>
<g>
<title> "OR" - Oregon
State capital city - Salem
Population
City 154,637
Estimate Estimate (2018) 173,442
</title>
<path id="OR" class="state" d="
M615.7-108.5l8.9-34.8l1.1-4.2l2.4-5.6l-0.6-1.2l-2.5,0l-1.3-1.7l0.5-1.5l0.5-3.2l4.5-5.5l1.8-1.1l1.1-1.1l1.5-3.6l4-5.7l3.6-3.9
l0.2-3.5l-3.3-2.5l-1.8-4.6l-12.7-3.6l-15.1-3.5l-15.4,0.1l-0.5-1.4l-5.5,2.1l-4.5-0.6l-2.4-1.6l-1.3,0.7l-4.7-0.2l-1.7-1.4
l-5.3-2.1l-0.8,0.1l-4.3-1.5l-1.9,1.8l-6.2-0.3l-5.9-4.1l0.7-0.8l0.2-7.8l-2.3-3.9l-4.1-0.6l-0.7-2.5l-2.4-0.5l-5.8,2.1l-2.3,6.5
l-3.2,10l-3.2,6.5l-5,14.1l-6.5,13.6l-8.1,12.6l-1.9,2.9l-0.8,8.6l0.4,12.1L615.7-108.5z"/>
</g>
<g>
<title> "WA" - Washington Territory
State capital city - Olympia
Population
City 46,478
Estimate (2018) 52,555
</title>
<path id="WA" class="state" class="state" d="
M569.1-276.4l4.4,1.5l9.7,2.7l8.6,1.9l20,5.7l23,5.7l15.2,3.2l-13.6,63.6l-12.4-3.5l-15.5-3.6l-15.2,0l-0.5-1.3l-5.6,2.2l-4.6-0.7
l-2.1-1.6L579-200l-4.7-0.1l-1.7-1.3l-5.3-2.1l-0.7,0.1l-4.4-1.5l-1.9,1.8l-6.3-0.3l-5.9-4.1l0.8-0.9l0.1-7.7l-2.3-3.8l-4.1-0.6
l-0.7-2.5l-2.3-0.5l-3.6,1.2l-2.3-3.2l0.3-2.9l2.7-0.3l1.6-4l-2.6-1.1l0.2-3.7l4.4-0.6l-2.7-2.7l-1.5-7.1l0.6-2.9v-7.9l-1.8-3.2
l2.3-9.4l2.1,0.5l2.4,2.9l2.7,2.6l3.2,1.9l4.5,2.1l3.1,0.6l2.9,1.5l3.4,1l2.3-0.2v-2.4l1.3-1.1l2.1-1.3l0.3,1.1l0.3,1.8l-2.3,0.5
l-0.3,2.1l1.8,1.5l1.1,2.4l0.6,1.9l1.5-0.2l0.2-1.3l-1-1.3l-0.5-3.2l0.8-1.8l-0.6-1.5v-2.3l1.8-3.6l-1.1-2.6l-2.4-4.9l0.3-0.8
L569.1-276.4z M559.6-270.4l2-0.2l0.5,1.4l1.5-1.6h2.3l0.8,1.5l-1.5,1.7l0.6,0.8l-0.7,2l-1.4,0.4c0,0-0.9,0.1-0.9-0.2
s1.5-2.6,1.5-2.6l-1.7-0.6l-0.3,1.5l-0.7,0.6l-1.5-2.3L559.6-270.4z"/>
</g>
<g>
<title> "CA" - California
State capital city - Sacramento
Population
City 466,488
Estimate (2018) 508,529
</title>
<path id="CA" class="state" d="
M611.7,98.2l3.9-0.5l1.5-2l0.5-2.9l-3.6-0.6l-0.5-0.7l0.5-2l-0.2-0.6l1.9-0.6l3-2.8l0.6-5l1.4-3.4l1.9-2.2l3.5-1.6l1.7-1.6l0.1-2.1
l-1-0.6l-1-1.1l-1.2-5.8l-2.7-4.8l0.6-3.5l-2.4-1L551.3-51.5l18.9-67.6l-67.1-15.7l-1.5,4.7l-0.2,7.4l-5.2,11.8l-3.1,2.6l-0.3,1.1
l-1.8,0.8l-1.5,4.2l-0.8,3.2l2.7,4.2l1.6,4.2l1.1,3.6l-0.3,6.5l-1.8,3.1l-0.6,5.8l-1,3.7l1.8,3.9l2.7,4.5l2.3,4.9l1.3,4l-0.3,3.2
l-0.3,0.5v2.1l5.7,6.3l-0.5,2.4l-0.6,2.3l-0.6,1.9l0.2,8.2l2.1,3.7l1.9,2.6l2.7,0.5l1,2.7l-1.1,3.6l-2.1,1.6h-1.1l-0.8,3.9l0.5,2.9
l3.2,4.4l1.6,5.3l1.5,4.7l1.3,3.1l3.4,5.8l1.5,2.6l0.5,2.9l1.6,1v2.4l-0.8,1.9l-1.8,7.1l-0.5,1.9l2.4,2.7l4.2,0.5l4.5,1.8l3.9,2.1
h2.9l2.9,3.1l2.6,4.9l1.1,2.3l3.9,2.1l4.8,0.8l1.5,2.1l0.6,3.2l-1.5,0.6l0.3,1l3.2,0.8l2.7,0.2l3.2-1.7l3.9,4.2l0.8,2.3l2.6,4.2
l0.3,3.2v9.4l0.5,1.8l10,1.5l19.7,2.7L611.7,98.2z M523.6,54.5l1.3,1.5l-0.2,1.3l-3.2-0.1l-0.6-1.2l-0.6-1.5L523.6,54.5z
M525.5,54.5l1.2-0.6l3.6,2.1l3.1,1.2l-0.9,0.6l-4.5-0.2l-1.6-1.6L525.5,54.5z M546.2,74.3l1.8,2.3l0.8,1l1.5,0.6l0.6-1.5l-1-1.8
l-2.7-2l-1.1,0.2V74.3z M544.7,82.9l1.8,3.2l1.2,1.9l-1.5,0.2l-1.3-1.2c0,0-0.7-1.5-0.7-1.9s0-2.2,0-2.2L544.7,82.9z"/>
</g>
</svg>
</section>
</body>不使用 Javascript 的选项
将鼠标悬停在对象上时，会出现阴影和多行工具提示。
适用于所有现代浏览器，包括 IE11、Edge
.state {
fill:white;
stroke:skyblue;
transform-origin: center center;
transform-box: fill-box;
}
:hover.state {
fill:blue;
stroke:white;
stroke-width:2px;
filter:url(#dropshadow);
}<body>
<section id="map">
<svg version="1.1"
id="svg2" xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="467 -284 959 593" xml:space="preserve">
<defs>
<filter id="dropshadow" height="130%">
<feGaussianBlur in="SourceAlpha" stdDeviation="3"/>
<feOffset dx="2" dy="2" result="offsetblur"/>
<feMerge>
<feMergeNode/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
<g>
<title>"ID" - IDAHO
State capital city - Boise
Population - 228,790
</title>
<path id="ID" class="state" d="
M615.5-107.5l8.8-35.2l1.4-4.2l2.5-5.9l-1.3-2.3l-2.5,0.1l-0.8-1l0.5-1.1l0.3-3.1l4.5-5.5l1.8-0.5l1.1-1.1l0.6-3.2l0.9-0.7l3.9-5.8
l3.9-4.3l0.2-3.8l-3.4-2.6l-1.5-4.4l13.6-63.3l13.5,2.5l-4.4,21.4l3.6,7.5l-1.6,4.7l2,4.6l3.1,1.3l3.8,9.6l3.5,4.4l0.5,1.1l3.3,1.1
l0.4,2.1l-7,17.4l-0.2,2.6l2.6,3.3l0.9,0l4.9-3l0.7-1.1l1.6,0.7l-0.3,5.4l2.7,12.6l3.9,3.2l1.7,2.2l-0.7,4.1l1.1,2.8l1.1,1.1
l2.5-2.4l2.8,0l2.9,1.3l2.8-0.7l3.8-0.2l4,1.6l2.7-0.3l0.5-3l2.9-0.8l1.3,1.5l0.4,2.9l1.4,1.2l-8.4,53.6
C710.4-89.3,622.5-106,615.5-107.5z"/>
</g>
<g>
<title> "UT" - Utah
State capital city - Salt Lake City
Population
City 186,440
Estimate Estimate (2018) 200,591
</title>
<path id="UT" class="state" d="M726.5,26.1l-83.7-11.9
l20.6-112.5l46.8,8.7l-1.5,10.6l-2.3,13.2l7.8,0.9l16.4,1.8l8.2,0.9L726.5,26.1z"/>
</g>
<g>
<title> "AZ" - Arizona
State capital city - Phoenix
Population
City 1,445,632
Estimate Estimate (2018) 1,660,272
</title>
<path id="AZ" class="state" d="
M611.9,98.6l-2.6,2.2l-0.3,1.5l0.5,1l18.9,10.7l12.1,7.6l14.7,8.6l16.8,10l12.3,2.4l25,2.7l17.3-119.1l-83.7-11.9l-3.1,16.4l-1.6,0
l-1.7,2.6l-2.5-0.1l-1.3-2.7l-2.7-0.3l-0.9-1.1H628l-0.9,0.6l-1.9,1l-0.1,7l-0.2,1.7l-0.6,12.6l-1.5,2.2l-0.6,3.3l2.7,4.9l1.3,5.8
l0.8,1l1,0.6l-0.1,2.3l-1.6,1.4l-3.4,1.7l-1.9,1.9l-1.5,3.7l-0.6,4.9l-2.9,2.7l-2.1,0.7l0.1,0.8l-0.5,1.7l0.5,0.8l3.7,0.6l-0.6,2.7
l-1.5,2.2L611.9,98.6z"/>
</g>
<g>
<title> "NV" - Nevada
State capital city - Carson City
Population
City 55,274
Estimate Estimate (2018) 55,414
</title>
<path id="NV" class="state" d="M663.4-98.4
L639.8,30.4l-1.8,0.3l-1.6,2.4l-2.4,0l-1.5-2.7l-2.6-0.4l-0.8-1.1l-1-0.1l-2.8,1.6l-0.3,6.8l-0.4,5.8l-0.3,8.6l-1.4,2.1l-2.4-1.1
L551.3-51.5l19-67.6L663.4-98.4z"/>
</g>
<g>
<title> "OR" - Oregon
State capital city - Salem
Population
City 154,637
Estimate Estimate (2018) 173,442
</title>
<path id="OR" class="state" d="
M615.7-108.5l8.9-34.8l1.1-4.2l2.4-5.6l-0.6-1.2l-2.5,0l-1.3-1.7l0.5-1.5l0.5-3.2l4.5-5.5l1.8-1.1l1.1-1.1l1.5-3.6l4-5.7l3.6-3.9
l0.2-3.5l-3.3-2.5l-1.8-4.6l-12.7-3.6l-15.1-3.5l-15.4,0.1l-0.5-1.4l-5.5,2.1l-4.5-0.6l-2.4-1.6l-1.3,0.7l-4.7-0.2l-1.7-1.4
l-5.3-2.1l-0.8,0.1l-4.3-1.5l-1.9,1.8l-6.2-0.3l-5.9-4.1l0.7-0.8l0.2-7.8l-2.3-3.9l-4.1-0.6l-0.7-2.5l-2.4-0.5l-5.8,2.1l-2.3,6.5
l-3.2,10l-3.2,6.5l-5,14.1l-6.5,13.6l-8.1,12.6l-1.9,2.9l-0.8,8.6l0.4,12.1L615.7-108.5z"/>
</g>
<g>
<title> "WA" - Washington Territory
State capital city - Olympia
Population
City 46,478
Estimate (2018) 52,555
</title>
<path id="WA" class="state" d="
M569.1-276.4l4.4,1.5l9.7,2.7l8.6,1.9l20,5.7l23,5.7l15.2,3.2l-13.6,63.6l-12.4-3.5l-15.5-3.6l-15.2,0l-0.5-1.3l-5.6,2.2l-4.6-0.7
l-2.1-1.6L579-200l-4.7-0.1l-1.7-1.3l-5.3-2.1l-0.7,0.1l-4.4-1.5l-1.9,1.8l-6.3-0.3l-5.9-4.1l0.8-0.9l0.1-7.7l-2.3-3.8l-4.1-0.6
l-0.7-2.5l-2.3-0.5l-3.6,1.2l-2.3-3.2l0.3-2.9l2.7-0.3l1.6-4l-2.6-1.1l0.2-3.7l4.4-0.6l-2.7-2.7l-1.5-7.1l0.6-2.9v-7.9l-1.8-3.2
l2.3-9.4l2.1,0.5l2.4,2.9l2.7,2.6l3.2,1.9l4.5,2.1l3.1,0.6l2.9,1.5l3.4,1l2.3-0.2v-2.4l1.3-1.1l2.1-1.3l0.3,1.1l0.3,1.8l-2.3,0.5
l-0.3,2.1l1.8,1.5l1.1,2.4l0.6,1.9l1.5-0.2l0.2-1.3l-1-1.3l-0.5-3.2l0.8-1.8l-0.6-1.5v-2.3l1.8-3.6l-1.1-2.6l-2.4-4.9l0.3-0.8
L569.1-276.4z M559.6-270.4l2-0.2l0.5,1.4l1.5-1.6h2.3l0.8,1.5l-1.5,1.7l0.6,0.8l-0.7,2l-1.4,0.4c0,0-0.9,0.1-0.9-0.2
s1.5-2.6,1.5-2.6l-1.7-0.6l-0.3,1.5l-0.7,0.6l-1.5-2.3L559.6-270.4z"/>
</g>
<g>
<title> "CA" - California
State capital city - Sacramento
Population
City 466,488
Estimate (2018) 508,529
</title>
<path id="CA" class="state" d="
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</body>关于html - 如何在悬停时向 SVG 内的路径元素添加阴影，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59269502/