html - css ~ 选择器不会将样式应用于所有目标元素(z-index 到下一个/上一个标签)

Question

我有以下纯 css 幻灯片，除了缩略图之外，我还尝试实现“下一个/上一个”按钮(两者都是指向 <input type="radio"> 的标签)。

缩略图是内部带有图像的标签，因此我为按钮创建了更多标签。问题是我无法弄清楚如何正确隐藏它们，除了选中的输入旁边的那些。

我试过下面的代码:

.slider input[name='slide_switch'] ~ label.next,
.slider input[name='slide_switch'] ~ label.previous
{
    z-index: -1
}
.slider input[name='slide_switch']:checked ~ label.next,
.slider input[name='slide_switch']:checked ~ label.previous {
    z-index: 1
}

那应该针对所有 <label class="next">和 <label class="previous">在 HTML 中，但由于某种原因它不起作用，我“可以看到”多个按钮，一个接一个，因为我给了它们 opacity: 0.6而且它们看起来不是半透明的。然而，最后两个显示正确的不透明度并且正在工作，如果我在最后一张图片中，我可以单击上一个按钮，它将带我到第 4 张图片，如果我单击下一张，它将带我到第 5 张(不幸的是，所有图片都会发生这种情况)。

我在这里工作:https://jsfiddle.net/5v6ajfup/

HTML代码:

<div class="slider">
    <input type="radio" name="slide_switch" id="id1"/>
    <label class="thumbnail" for="id1">
        <img src="http://thecodeplayer.com/uploads/media/3yiC6Yq.jpg" width="100"/>
    </label>
    <img src="http://thecodeplayer.com/uploads/media/3yiC6Yq.jpg"/>
    <label class="next" for="id2">></label>

    <input type="radio" name="slide_switch" id="id2" checked="checked"/>
    <label class="thumbnail" for="id2">
        <img src="http://thecodeplayer.com/uploads/media/40Ly3VB.jpg" width="100"/>
    </label>
    <img src="http://thecodeplayer.com/uploads/media/40Ly3VB.jpg"/>
    <label class="previous" for="id1">></label>
    <label class="next" for="id3">></label>

    <input type="radio" name="slide_switch" id="id3"/>
    <label class="thumbnail" for="id3">
        <img src="http://thecodeplayer.com/uploads/media/00kih8g.jpg" width="100"/>
    </label>
    <img src="http://thecodeplayer.com/uploads/media/00kih8g.jpg"/>
    <label class="previous" for="id2">></label>
    <label class="next" for="id4">></label>

    <input type="radio" name="slide_switch" id="id4"/>
    <label class="thumbnail" for="id4">
        <img src="http://thecodeplayer.com/uploads/media/2rT2vdx.jpg" width="100"/>
    </label>
    <img src="http://thecodeplayer.com/uploads/media/2rT2vdx.jpg"/>
    <label class="next" for="id5">></label>
    <label class="previous" for="id3">></label>

    <input type="radio" name="slide_switch" id="id5"/>
    <label class="thumbnail" for="id5">
        <img src="http://thecodeplayer.com/uploads/media/8k3N3EL.jpg" width="100"/>
    </label>
    <img src="http://thecodeplayer.com/uploads/media/8k3N3EL.jpg"/>
    <label class="previous" for="id4">></label>
</div>

CSS代码:

* { margin: 0; padding: 0 }
body { background: #ccc }
.slider {
    width: 640px;
    position: relative;
    padding-top: 320px;
    margin: 20px auto;
    box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.75);
}
.slider > img {
    position: absolute;
    left: 0; top: 0;
    transition: all 0.5s;
    display: block
}
.slider input[name='slide_switch'] {
    display: none;
}
.slider label.next, .slider label.previous {
    position: absolute;
    left: 0; top: 0;
    display: block;
    font-size:3em;
    opacity: 0.6;
    cursor: pointer;
    color: white;
}
.slider label.next { left: 560px; line-height: 320px }
.slider label.previous { left: 50px; line-height: 320px; transform: rotateY(180deg) }
.slider label.thumbnail {
    margin: 18px 0 0 18px;
    border: 3px solid #999;
    float: left;
    cursor: pointer;
    transition: all 0.5s;
    opacity: 0.6;
}
.slider label.thumbnail:hover { opacity: 0.8 }
.slider label.thumbnail img {
    display: block;
}
.slider input[name='slide_switch']:checked + label.thumbnail {
    border-color: #666;
    opacity: 1;
}
.slider input[name='slide_switch'] ~ label.next,
.slider input[name='slide_switch'] ~ label.previous
{
    z-index: -1
}
.slider input[name='slide_switch']:checked ~ label.next,
.slider input[name='slide_switch']:checked ~ label.previous {
    z-index: 1
}
.slider input[name='slide_switch'] ~ img {
    opacity: 0;
    transform: scale(1.1);
}
.slider input[name='slide_switch']:checked + label.thumbnail + img {
    opacity: 1;
    transform: scale(1);
}

( Source )

Answer 1

这条规则

.slider input[name='slide_switch']:checked ~ label.next,
.slider input[name='slide_switch']:checked ~ label.previous {
    z-index: 1
}

将针对 所有 label.next/label.previous input[name='slide_switch']，而且不仅是下一个 input[name='slide_switch'] 之前的立即数。

您需要使用它们的 for 属性定位每个 input[name='slide_switch'] 特定标签，或者使用 nth-of-type

---

根据评论更新

解决方案 1 - 首选

不是改变上面的 :checked 规则，而是将每组 input/image/thumb/arrow 包装在一个 div 中并改变这个规则的 .slider > img 选择器到 slider > div > img

Updated fiddle

堆栈片段

* { margin: 0; padding: 0 }
body { background: #ccc }
.slider {
	width: 640px;
	position: relative;
	padding-top: 320px;
	margin: 20px auto;
	box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.75);
}
.slider > div > img {
	position: absolute;
	left: 0; top: 0;
	transition: all 0.5s;
    display: block
}
.slider input[name='slide_switch'] {
	display: none;
}
.slider label.next, .slider label.previous {
	position: absolute;
	left: 0; top: 0;
    display: block;
    font-size:3em;
	opacity: 0.6;
	cursor: pointer;
    color: white;
}
.slider label.next { left: 560px; line-height: 320px }
.slider label.previous { left: 50px; line-height: 320px; transform: rotateY(180deg) }
.slider label.thumbnail {
	margin: 18px 0 0 18px;
	border: 3px solid #999;
	float: left;
	cursor: pointer;
	transition: all 0.5s;
	opacity: 0.6;
}
.slider label.thumbnail:hover { opacity: 0.8 }
.slider label.thumbnail img {
	display: block;
}
.slider input[name='slide_switch']:checked + label.thumbnail {
	border-color: #666;
	opacity: 1;
}
.slider input[name='slide_switch'] ~ label.next,
.slider input[name='slide_switch'] ~ label.previous
{
	z-index: -1
}
.slider input[name='slide_switch']:checked ~ label.next,
.slider input[name='slide_switch']:checked ~ label.previous {
	z-index: 1
}
.slider input[name='slide_switch'] ~ img {
	opacity: 0;
	transform: scale(1.1);
}
.slider input[name='slide_switch']:checked + label.thumbnail + img {
	opacity: 1;
	transform: scale(1);
}

<div class="slider">

  <div>
    <input type="radio" name="slide_switch" id="id1" />
    <label class="thumbnail" for="id1">
      <img src="http://thecodeplayer.com/uploads/media/3yiC6Yq.jpg" width="100" />
    </label>
    <img src="http://thecodeplayer.com/uploads/media/3yiC6Yq.jpg" />
    <label class="next" for="id2">></label>
  </div>

  <div>
    <input type="radio" name="slide_switch" id="id2" checked/>
    <label class="thumbnail" for="id2">
      <img src="http://thecodeplayer.com/uploads/media/40Ly3VB.jpg" width="100" />
    </label>
    <img src="http://thecodeplayer.com/uploads/media/40Ly3VB.jpg" />
    <label class="previous" for="id1">></label>
    <label class="next" for="id3">></label>
  </div>

  <div>
    <input type="radio" name="slide_switch" id="id3" />
    <label class="thumbnail" for="id3">
      <img src="http://thecodeplayer.com/uploads/media/00kih8g.jpg" width="100" />
    </label>
    <img src="http://thecodeplayer.com/uploads/media/00kih8g.jpg" />
    <label class="previous" for="id2">></label>
    <label class="next" for="id4">></label>
  </div>

  <div>
    <input type="radio" name="slide_switch" id="id4" />
    <label class="thumbnail" for="id4">
      <img src="http://thecodeplayer.com/uploads/media/2rT2vdx.jpg" width="100" />
    </label>
    <img src="http://thecodeplayer.com/uploads/media/2rT2vdx.jpg" />
    <label class="next" for="id5">></label>
    <label class="previous" for="id3">></label>
  </div>

  <div>
    <input type="radio" name="slide_switch" id="id5" />
    <label class="thumbnail" for="id5">
      <img src="http://thecodeplayer.com/uploads/media/8k3N3EL.jpg" width="100" />
    </label>
    <img src="http://thecodeplayer.com/uploads/media/8k3N3EL.jpg" />
    <label class="previous" for="id4">></label>
  </div>

</div>

---

解决方案2

替换这条规则

.slider input[name='slide_switch']:checked ~ label.next,
.slider input[name='slide_switch']:checked ~ label.previous {
    z-index: 1
}

有了这个

.slider input#id1:checked ~ label[for="id2"],
.slider input#id2:checked ~ label[for="id1"],
.slider input#id2:checked ~ label[for="id3"],
.slider input#id3:checked ~ label[for="id2"],
.slider input#id3:checked ~ label[for="id4"],
.slider input#id4:checked ~ label[for="id3"],
.slider input#id4:checked ~ label[for="id5"],
.slider input#id5:checked ~ label[for="id4"]
{
    z-index: 1;
}