当选中复选框时如何为父元素设置样式？

Question

所以我一直在读，css中没有父选择器（这有点奇怪）。仅使用CSS选中复选框时，这是否表示我无法更改.fake-checkbox上的背景吗？

代码看起来像这样：

  <div class="checkbox">
    <span class="fake-checkbox" id="chkbx">
      <input type="checkbox" />
      <svg class="svg svg-icon" viewBox="0 0 20 20">
        <path d="M7.97832489 13.4912738 3.56842362 9.01683836 2 10.6248752 8.17428734 17 18 4.49099934 16.1436545 3z"></path>
      </svg>
    </span>
    <label for="chkbx">Recurring object</label>
  </div>

See code in Codepen。

理想的选择器将是：

input:checked < span { background-color: green; }

Answer 1

可以将<input type="checkbox"/>从<span>中移出：

.selector * {
  box-sizing: border-box;
}
.selector {
  display: inline-block;
}
.selector input {
  position: absolute;
  min-width: 1em;
  width: 100%;
  height: 100%;
  z-index: 2;
  opacity: 0;
  margin: 0;
  padding: 0;
  cursor: pointer;
}
.selector .checkbox {
  display: flex;
}
.selector .checkbox label {
  display: inline-block;
}
.fake-checkbox {
  position: relative;
  height: 21px;
  width: 21px;
  border: solid 1px #Fff;
  display: inline-block;
  border-radius: 3px;
}
.selector .checkbox.p-is-hover,
.selector .checkbox.p-is-indeterminate {
  display: none;
}

/* SVG style */
.selector.p-svg .checkbox .svg {
  width: 16px;
  height: 16px;
  align-items: center;
  border: 0;
  opacity: 0;
  fill: #fff;
}
.selector.p-svg input:checked ~ span .svg {
  opacity: 1;
}
.selector .checkbox.left .fake-checkbox,
.selector .checkbox.left .fake-checkbox {
  left: 0;
}
.selector .checkbox.right .fake-checkbox,
.selector .checkbox.right .fake-checkbox {
  right: 0;
}
.selector .checkbox.left label {
  margin-left: 8px;
}
.selector .checkbox.right {
  flex-direction: row-reverse;
}
.selector .checkbox.right label {
  margin-right: 8px;
}
input:checked ~ span {
  background-color: green;
}
body {
  color: #fff;
  background-color: #1D1E22
}

<div class="selector p-svg">  
  <div class="checkbox left">
    <input type="checkbox" />
    <span class="fake-checkbox" id="chkbx">       
      <svg class="svg svg-icon">
        <path d="M7.97832489 13.4912738 3.56842362 9.01683836 2 10.6248752 8.17428734 17 18 4.49099934 16.1436545 3z">   
        </path>
      </svg>
    </span>
    <label for="chkbx">Recurring object</label>
  </div>
</div>

Answer 2

可以使用Sass，请参见

• http://thesassway.com/intermediate/referencing-parent-selectors-using-ampersand
• https://sass-lang.com/documentation/style-rules/parent-selector