单击SVG元素时应用于焦点CSS

时间：2019-07-10 14:01:23

标签： javascript html css dom svg

我有一个svg文件。

我希望当我单击电台名称时，电台会保持缩放状态。

为此，我使用了focus方法，然后在CSS中使用选择器:focused应用效果

但这不起作用，什么也没发生。

ps：您可以忽略forEach循环，了解并不是很重要

let stops = document.querySelector("#stops");
// all the g elements in the stops 
let gs = stops.querySelectorAll("g");

// for each g in the gs
gs.forEach(g=>{
  // the rectangle in this g element
  let thisRect = g.querySelector("rect");
  // the circle in this g element
  let thisCircle = g.querySelector("circle");
  // the coords of the circle's center used for the transform-origin
  let x = thisCircle.getAttribute("cx");
  let y = thisCircle.getAttribute("cy");
  // the bounding box of the group
  let bb = g.getBBox();
  // set the rect's attributes
  thisRect.setAttributeNS(null, "x", bb.x);
  thisRect.setAttributeNS(null, "y", bb.y);
  thisRect.setAttributeNS(null, "width", bb.width);
  thisRect.setAttributeNS(null, "height", bb.height);
  
  // set the value for the transform-origin for this group
  g.style.transformOrigin =  `${x}px ${y}px`;
  

  
})

  document.getElementById('g3670').focus()
  
  function showmessage() {
  alert("heloo");
  }
text{
  font-family: Lato;
  font-size:16px;
}
g * {pointer-events:none;}
g rect{pointer-events:all;}
#stops g{transform: scale(1);cursor: pointer;}
#stops g:hover {
    transform: scale(2); 
}
#stops g:active {

    transform: scale(2)
}
<svg id="Calque_1" data-name="Calque 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 775.43 469.98">
    <defs>
        <style>.cls-1{fill:none;stroke-width:5px;}.cls-1,.cls-2{stroke:#a15256;}.cls-2{fill:#fff;}.cls-3{isolation:isolate;font-size:42.79px;font-family:ArialMT, Arial;}</style>
    </defs>
    <title>line</title>
    <path id="path7" class="cls-1" d="M202,67.72,329.33,215.86" transform="translate(-200.1 -66.09)" />
    <path id="path8" class="cls-1" d="M329.35,215.87,449,355" transform="translate(-200.1 -66.09)" />
    <path id="path9" class="cls-1" d="M449,355c41.53,51.11,96.22,63.08,117.9,69.28" transform="translate(-200.1 -66.09)" />
    <path id="path10" class="cls-1" d="M566.86,424.29C655.43,460.48,977.38,391.48,973,536" transform="translate(-200.1 -66.09)" />
    <g id="stops">
        <g id="g3670">
            <rect fill="none"/>
            <circle class="cls-2" cx="129.24" cy="149.78" r="13.58" />
            <text id="text3668" class="cls-3" transform="translate(145 160)">Station1</text>
        </g>
        <g id="g3700">
            <rect fill="none"/>
            <circle class="cls-2" cx="248.91" cy="288.93" r="13.58" />
            <text id="text3698" class="cls-3" transform="translate(270 300)">Station2</text>
        </g>
        <g id="g3750">
            <rect fill="none"/>
            <circle class="cls-2" cx="366.75" cy="358.2" r="13.58" />
            <text id="text3748" class="cls-3" transform="translate(200 400)">Station3</text>
        </g>
    </g>
</svg>

2 个答案:

答案 0 :(得分：2)

将componentWillUnmount()添加到电台：

setState
tabindex
let stops = document.querySelector("#stops");
// all the g elements in the stops 
let gs = stops.querySelectorAll("g");

// for each g in the gs
gs.forEach((g, i) => {
  g.setAttribute('tabindex', i);
  // the rectangle in this g element
  let thisRect = g.querySelector("rect");
  // the circle in this g element
  let thisCircle = g.querySelector("circle");
  // the coords of the circle's center used for the transform-origin
  let x = thisCircle.getAttribute("cx");
  let y = thisCircle.getAttribute("cy");
  // the bounding box of the group
  let bb = g.getBBox();
  // set the rect's attributes
  thisRect.setAttributeNS(null, "x", bb.x);
  thisRect.setAttributeNS(null, "y", bb.y);
  thisRect.setAttributeNS(null, "width", bb.width);
  thisRect.setAttributeNS(null, "height", bb.height);
  
  // set the value for the transform-origin for this group
  g.style.transformOrigin =  `${x}px ${y}px`;
  

  
})

  document.getElementById('g3670').focus()
  
  function showmessage() {
  alert("heloo");
  }

答案 1 :(得分：1)

这就是我的操作方式：单击后，我将为所单击的组切换类active。在您的代码中，我添加了以下内容：

  g.addEventListener("click",()=>{
    g.classList.toggle("active")
  })
在forEach内

。 

let stops = document.querySelector("#stops");
// all the g elements in the stops 
let gs = stops.querySelectorAll("g");

// for each g in the gs
gs.forEach(g=>{
  // the rectangle in this g element
  let thisRect = g.querySelector("rect");
  // the circle in this g element
  let thisCircle = g.querySelector("circle");
  // the coords of the circle's center used for the transform-origin
  let x = thisCircle.getAttribute("cx");
  let y = thisCircle.getAttribute("cy");
  // the bounding box of the group
  let bb = g.getBBox();
  // set the rect's attributes
  thisRect.setAttributeNS(null, "x", bb.x);
  thisRect.setAttributeNS(null, "y", bb.y);
  thisRect.setAttributeNS(null, "width", bb.width);
  thisRect.setAttributeNS(null, "height", bb.height);
  
  // set the value for the transform-origin for this group
  g.style.transformOrigin =  `${x}px ${y}px`;
  
  
  g.addEventListener("click",()=>{
    g.classList.toggle("active")
  })
  

  
})

  document.getElementById('g3670').focus()
  
  function showmessage() {
  console.log("heloo");
  }
text{
  font-family: Lato;
  font-size:16px;
}
g * {pointer-events:none;}
g rect{pointer-events:all;}
#stops g{transform: scale(1);cursor: pointer;}
#stops g:hover {
    transform: scale(2); 
}
#stops g.active {
    transform: scale(2)
}
<svg id="Calque_1" data-name="Calque 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 775.43 469.98">
    <defs>
        <style>.cls-1{fill:none;stroke-width:5px;}.cls-1,.cls-2{stroke:#a15256;}.cls-2{fill:#fff;}.cls-3{isolation:isolate;font-size:42.79px;font-family:ArialMT, Arial;}</style>
    </defs>
    <title>line</title>
    <path id="path7" class="cls-1" d="M202,67.72,329.33,215.86" transform="translate(-200.1 -66.09)" />
    <path id="path8" class="cls-1" d="M329.35,215.87,449,355" transform="translate(-200.1 -66.09)" />
    <path id="path9" class="cls-1" d="M449,355c41.53,51.11,96.22,63.08,117.9,69.28" transform="translate(-200.1 -66.09)" />
    <path id="path10" class="cls-1" d="M566.86,424.29C655.43,460.48,977.38,391.48,973,536" transform="translate(-200.1 -66.09)" />
    <g id="stops">
        <g id="g3670">
            <rect fill="none"/>
            <circle class="cls-2" cx="129.24" cy="149.78" r="13.58" />
            <text id="text3668" class="cls-3" transform="translate(145 160)">Station1</text>
        </g>
        <g id="g3700">
            <rect fill="none"/>
            <circle class="cls-2" cx="248.91" cy="288.93" r="13.58" />
            <text id="text3698" class="cls-3" transform="translate(270 300)">Station2</text>
        </g>
        <g id="g3750">
            <rect fill="none"/>
            <circle class="cls-2" cx="366.75" cy="358.2" r="13.58" />
            <text id="text3748" class="cls-3" transform="translate(200 400)">Station3</text>
        </g>
    </g>
</svg>

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