JavaScript 和 SVG：如何增加 onClick 事件的可点击区域？

Question

我的脚本在屏幕上以 3 的笔画宽度绘制线条。线条的大小是理想的（视觉上），但它们不太容易点击。

作为一个粗略的例子：

 function selectStrand(evt) { current_id = evt.target.getAttributeNS(null, "id"); document.getElementById('main').innerHTML = current_id; }

 Selected line: <span id="main"></span> <svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%" preserveAspectRatio="xMinYMin meet" viewBox="0 0 1000 1000"> <g id="buffer" transform="translate(10,0)"> <line id="blue-blue" x1="50" y1="50" x2="500" y2="50" style="stroke:blue; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-orange" x1="50" y1="70" x2="500" y2="70" style="stroke:orange; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-green" x1="50" y1="90" x2="500" y2="90" style="stroke:green; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-brown" x1="50" y1="110" x2="500" y2="110" style="stroke:brown; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-grey" x1="50" y1="130" x2="500" y2="130" style="stroke:grey; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-khaki" x1="50" y1="150" x2="500" y2="150" style="stroke:khaki; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-red" x1="50" y1="170" x2="500" y2="170" style="stroke:red; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-black" x1="50" y1="190" x2="500" y2="190" style="stroke:black; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-yellow" x1="50" y1="210" x2="500" y2="210" style="stroke:yellow; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-purple" x1="50" y1="230" x2="500" y2="230" style="stroke:purple; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-pink" x1="50" y1="250" x2="500" y2="250" style="stroke:pink; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> <line id="blue-cyan" x1="50" y1="270" x2="500" y2="270" style="stroke:cyan; stroke-width: 4;" stroke-linecap="round" onclick="selectStrand(evt)"/> </g> </g> </svg>

有没有一种简单的方法来增加每条线周围的面积，使它们更容易点击？

Answer 1

对于每条线，尝试在其顶部绘制一条具有较大笔触宽度的透明线，并在其上设置 onclick。

Answer 2

上述答案的变体。 对于一个很酷的选择效果，将每条细线和透明线组合成一组，细线在顶部。 将 onclick 设置为组，然后在 onclick 中为粗线的透明度设置动画。