html - 具有 transform 属性的元素内的子元素 z-index

标签 html css z-index css-transforms

我遇到了一个问题，我想知道你们是否可以帮助我解决这个问题。

如代码片段所示，我有一些元素

transform: translate(0,0);

然后，在它们内部，我有一个“下拉”元素，当您单击按钮时会显示该元素。

当这个下拉列表的一部分隐藏在其他元素后面时，问题就来了，我发现这是因为它的父元素有这个转换属性。

enter image description here

我的代码有更多的东西，代码片段只是一个例子。我无法摆脱转换属性。

我想知道是否有任何解决方案。我正在尝试仅使用 CSS 来解决它。

干杯!

$(document).ready(function() {
  $('button[name="button"]').click(function(e) {
    $(e.currentTarget).parent().find('.template-options-dropdown').toggleClass('open');
  });
});
.boxes {
  list-style-type: none;
}

.boxes >li {
  float: left;
  width: 100px;
  height: 100px;
  background-color: red;
  margin: 5px;
  transform: translate(0, 0);
}

.download-container {
  background: rgba(40, 39, 39, 0.8);
  bottom: 0;
  position: absolute;
  text-align: center;
  width: 100%;
}

.download-container .dropdown-container {
  display: inline-block;
  position: relative;
}

.download-container .dropdown-container button {
  background: #0bb9ab;
  color: #fff;
  padding: 6px 12px;
}

.template-options-dropdown {
  list-style-type: none;
  text-align: left;
  padding: 0;
  position: absolute;
  background-color: #111;
  visibility: hidden;
}

.template-options-dropdown.open {
  visibility: visible;
}

.template-options-dropdown li a {
  color: white;
  text-decoration: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="boxes">
  <li>
    <div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div>
  </li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
</ul>

最佳答案

不幸的是，可能没有纯 CSS 解决方案 - CSS3 转换创建了一个新的堆栈上下文 - 请参阅相关文档描述和 this thread另一种效果:

If the property has a value different than none, a stacking context will be created.

Source: MDN

您可以轻松地将 translate(0,0) 替换为 position: relative 并添加一个大于零的 z-index 到 .template-options-dropdown 解决问题。

$(document).ready(function() {
  $('button[name="button"]').click(function(e) {
    $(e.currentTarget).parent().find('.template-options-dropdown').toggleClass('open');
  });
});
.boxes {
  list-style-type: none;
}

.boxes >li {
  float: left;
  width: 100px;
  height: 100px;
  background-color: red;
  margin: 5px;
  /*transform: translate(0, 0);*/
  position: relative; /*ADDED*/
}

.download-container {
  background: rgba(40, 39, 39, 0.8);
  bottom: 0;
  position: absolute;
  text-align: center;
  width: 100%;
}

.download-container .dropdown-container {
  display: inline-block;
  position: relative;
}

.download-container .dropdown-container button {
  background: #0bb9ab;
  color: #fff;
  padding: 6px 12px;
}

.template-options-dropdown {
  list-style-type: none;
  text-align: left;
  padding: 0;
  position: absolute;
  background-color: #111;
  visibility: hidden;
  z-index: 2;/*ADDED*/
}

.template-options-dropdown.open {
  visibility: visible;
}

.template-options-dropdown li a {
  color: white;
  text-decoration: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="boxes">
  <li>
    <div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div>
  </li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
</ul>

一个 hacky 解决方案，它弄乱了包装 - 您可以添加更多转换:

  1. 为 ul 添加 scaleY(-1) 使列表向后排列，因为具有较高索引的列表项位于第一个列表项之上指数较低。

  2. 向 li 添加一个反转 scaleY(-1) 使世界恢复正常。

  3. 同时清除 li float 。

请看下面的演示:

$(document).ready(function() {
  $('button[name="button"]').click(function(e) {
    $(e.currentTarget).parent().find('.template-options-dropdown').toggleClass('open');
  });
});
.boxes {
  list-style-type: none;
  transform: scaleY(-1);/*ADDED*/
}
.boxes:after {/*ADDED*/
  content: '';
  clear: both;
  display: block;
}

.boxes >li {
  float: left;
  width: 100px;
  height: 100px;
  background-color: red;
  margin: 5px;
  transform: translate(0, 0) scaleY(-1);/*ADDED*/
}

.download-container {
  background: rgba(40, 39, 39, 0.8);
  bottom: 0;
  position: absolute;
  text-align: center;
  width: 100%;
}

.download-container .dropdown-container {
  display: inline-block;
  position: relative;
}

.download-container .dropdown-container button {
  background: #0bb9ab;
  color: #fff;
  padding: 6px 12px;
}

.template-options-dropdown {
  list-style-type: none;
  text-align: left;
  padding: 0;
  position: absolute;
  background-color: #111;
  visibility: hidden;
}

.template-options-dropdown.open {
  visibility: visible;
}

.template-options-dropdown li a {
  color: white;
  text-decoration: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="boxes">
  <li>
    <div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div>
  </li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
</ul>

如果 translate(0,0) 仍然无法删除，您别无选择，只能使用 javascript:

  1. 通过给定一个等于列表中索引的 z-index 来反转列表堆叠。

  2. 将position:relative添加到li

请看下面的演示:

$(document).ready(function() {

  // ADDED
  $($('ul.boxes > li').get().reverse()).each(function(index){
     $(this).css('z-index', index);
  });

  $('button[name="button"]').click(function(e) {
    $(e.currentTarget).parent().find('.template-options-dropdown').toggleClass('open');
  });
});
.boxes {
  list-style-type: none;
}

.boxes >li {
  float: left;
  width: 100px;
  height: 100px;
  background-color: red;
  margin: 5px;
  transform: translate(0, 0);
  position: relative;/*ADDED*/
}

.download-container {
  background: rgba(40, 39, 39, 0.8);
  bottom: 0;
  position: absolute;
  text-align: center;
  width: 100%;
}

.download-container .dropdown-container {
  display: inline-block;
  position: relative;
}

.download-container .dropdown-container button {
  background: #0bb9ab;
  color: #fff;
  padding: 6px 12px;
}

.template-options-dropdown {
  list-style-type: none;
  text-align: left;
  padding: 0;
  position: absolute;
  background-color: #111;
  visibility: hidden;
}

.template-options-dropdown.open {
  visibility: visible;
}

.template-options-dropdown li a {
  color: white;
  text-decoration: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="boxes">
  <li>
    <div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div>
  </li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
</ul>

关于html - 具有 transform 属性的元素内的子元素 z-index，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46249594/

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