隐藏SVG会影响同一页面中的其他SVG样式 [英] Hidding SVG affects other SVG styles in the same page

问题描述

同一页中多次加载了SVG. SVG用于显示值的图形表示.想象一下一个地图，其中每个区域都使用颜色代码显示给定的值.

An SVG is loaded several times in the same page. The SVG is used to show a graphic representation of values. Think of a map where every region shows a given value using a color code.

在每个SVG中，针对每个区域动态地应用CSS类以匹配所需的SVG模式填充.

In each SVG, for every region a CSS class is dynamically applied to match the desired SVG pattern fill used.

CSS样式和样式在SVG文件中定义.这是一个示例:

CSS styles and patterns are defined in the SVG file. Here is an example:

  <svg height="100" width="100">
    <style>
    /*  */
    .striped-pain-1 {fill: url(#striped-pain-1);}
    /*  */
    </style>
    <defs>
        <pattern id="striped-pain-1" width="4" height="1" patternTransform="rotate(45 0 0)" patternUnits="userSpaceOnUse">
            <line x1="0" y1="0" x2="0" y2="2" style="stroke:#EABFD5; stroke-width:6"></line>
        </pattern>
    </defs>

问题是当其中的SVG处于隐藏状态时(例如，通过display:none)，从那里到页面底部的所有SVG都会丢失图案填充.

The problem is when on of the SVGs is hidden (via display:none for example) all SVGs from there to the bottom of the page loose the pattern fill.

我制作了一个简化的Plunker来显示问题.

I have made a simplified Plunker showing the problem.

https://plnkr.co/edit/F5TzOwDEzneHEW7PT3Ls?p=preview

我发现防止这种情况的唯一方法是为每个SVG使用不同的模式ids，但是由于所有人都共享同一文件，因此我不喜欢重复全部复制并为此重命名ID的解决方案.我不知道应该有更好的解决方案.

The only way I have found to prevent this is using different pattern ids for every SVG, but since all share the same file I don't like the solution to duplicate all of them and rename the ids just for this. I wonder there should be a better solution.

推荐答案

我会将模式放在另一个svg元素中:<svg class="defs">.此svg元素可能具有position:absolute以及非常小的宽度和高度.如果添加left: -200px;，则此svg元素不可见.

I would put the patterns in a different svg element: <svg class="defs">. This svg element may have position:absolute and a very small width and height. If you add left: -200px; this svg element is invisible.

也:如果一个SVG元素具有以下CSS规则:.striped-pain-1 {fill: url(#striped-pain-1);}，则无需将其添加到第二个SVG元素中.实际上，您可以从svg中删除<style>元素，并将此规则添加到css中.

Also: if one SVG element has this css rule: .striped-pain-1 {fill: url(#striped-pain-1);} you don't need to add it to the second one. In fact you can delete the <style> element from the svg and add this rule to the css.

请尝试:单击数字(1,2,3)隐藏或取消隐藏svg元素.

Please try it: click the numbers (1,2,3) to hide or unhide the svg elements.

let spans = Array.from(document.querySelectorAll("#commands span"))
let svgs = Array.from(document.querySelectorAll(".svgcontainer"))
spans.forEach((s,i) =>{
let n = 0;
s.addEventListener("click",(e)=>{
n++;
let thisSvg = svgs[i].querySelector("svg")
if(n%2 == 1){thisSvg.style.display="none";
            }else{
             thisSvg.style.display="block";}
})
})

svg {
  display:block;
}
.defs {
  position: absolute;
  left: -200px;
}
span {
  display: inline-block;
  width: 2em;
  height: 1em;
  border: 1px solid;
  text-align: center;
  cursor: pointer;
}
.svgcontainer {
  height: 100px;
  width: 100px;
  border: 1px solid;
  display: inline-block;
}

<p id="commands"><span>1</span> <span>2</span> <span>3</span></p>

<svg class="defs" width="1" height="1">
  <defs>
  		<pattern id="striped-pain-1" width="4" height="1" patternTransform="rotate(45 0 0)" patternUnits="userSpaceOnUse">
  			<line x1="0" y1="0" x2="0" y2="2" style="stroke:#EABFD5; stroke-width:6"></line>
  		</pattern>
    
      <pattern id="striped-pain-2" width="4" height="1" patternTransform="rotate(45 0 0)" patternUnits="userSpaceOnUse">
    		<line x1="0" y1="0" x2="0" y2="2" style="stroke:#EABFD5; stroke-width:6"></line>
    	</pattern>
  	</defs>
</svg>

<div class="svgcontainer">
  <svg height="100" width="100">
  	<style>
  		/*  */
  		.striped-pain-1 {fill: url(#striped-pain-1);}
  		/*  */
  	</style>
    
    <circle class="striped-pain-1" cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
  </svg> 

</div>
<div class="svgcontainer">
  <svg height="100" width="100">
   <!-- <style>
    		/*  */
    		.striped-pain-1 {fill: url(#striped-pain-1);}
    		/*  */
    </style>-->
    <!--<defs>
    	<pattern id="striped-pain-1" width="4" height="1" patternTransform="rotate(45 0 0)" patternUnits="userSpaceOnUse">
    		<line x1="0" y1="0" x2="0" y2="2" style="stroke:#EABFD5; stroke-width:6"></line>
    	</pattern>
    </defs>-->
    <circle class="striped-pain-1" cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
  </svg> 
</div>
<div class="svgcontainer">
  <svg height="100" width="100">
    <style>
    		/*  */
    		.striped-pain-2 {fill: url(#striped-pain-2);}
    		/*  */
    </style>
    <circle class="striped-pain-2" cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
  </svg> 
</div>

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