使用 CSS3 伪元素格式化图表

Question

我正在使用无序列表构建祖先图表，但我无法让它在屏幕上正确显示。我开始使用来自 CSS3 Family Tree 的代码，尽管名称如此，但生成的是组织结构图而不是家谱。

出于测试的目的，我有 HTML 和 CSS 这样的：

.tree ul {
  padding-top: 20px;
  position: relative;
}
.tree li {
  display: inline-block;
  white-space: nowrap;
  vertical-align: top;
  margin: 0 -2px 0 -2px;
  text-align: center;
  list-style-type: none;
  position: relative;
  padding: 20px 5px 0 5px;
}
/*We will use ::before and ::after to draw the connectors*/

.tree li::before,
.tree li::after {
  content: '';
  position: absolute;
  top: 0;
  right: 50%;
  border-top: 1px solid #ccc;
  width: 50%;
  height: 20px;
}
.tree li::after {
  right: auto;
  left: 50%;
  border-left: 1px solid #ccc;
}
/*We need to remove left-right connectors from elements without 
any siblings*/

.tree li:only-child::after,
.tree li:only-child::before {
  display: none;
}
/*Remove space from the top of single children*/

.tree li:only-child {
  padding-top: 0;
}
/*Remove left connector from first child and 
right connector from last child*/

.tree li:first-child::before,
.tree li:last-child::after {
  border: 0 none;
}
/*Adding back the vertical connector to the last nodes*/

.tree li:last-child::before {
  border-right: 1px solid #ccc;
  border-radius: 0 5px 0 0;
  -webkit-border-radius: 0 5px 0 0;
  -moz-border-radius: 0 5px 0 0;
}
.tree li:first-child::after {
  border-radius: 5px 0 0 0;
  -webkit-border-radius: 5px 0 0 0;
  -moz-border-radius: 5px 0 0 0;
}
/*Time to add downward connectors from parents*/

.tree ul ul::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  border-left: 1px solid #ccc;
  width: 0;
  height: 20px;
}
.tree li a {
  border: 1px solid #ccc;
  padding: 5px 10px;
  text-decoration: none;
  color: #666;
  font-family: arial, verdana, tahoma;
  font-size: 11px;
  display: inline-block;
  border-radius: 5px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
}

<div class="tree">
  <ul>
    <li>
      <a href="#">Self</a>
      <ul>
        <li>
          <a href="#">Father</a>
          <ul>
            <li><a href="#">Grandfather</a>
            </li>
            <li>
              <a href="#">Grandmother</a>
            </li>
          </ul>
        </li>
        <li>
          <a href="#">Mother</a>
          <ul>
            <li><a href="#">Grandfather</a>
            </li>
            <li>
              <a href="#">Grandmother</a>
            </li>
          </ul>
        </li>
      </ul>
    </li>
  </ul>
</div>

CSS 几乎直接来自 CSS3 家谱。

这会生成如下所示的图表

但我需要倒过来，“自己”在最下面，最早的一代在最上面

我可以通过反转列表结构来反转方框，但我找不到修改 CSS 让连接器看起来正确的方法。

有没有办法修改::before和::after伪元素来得到我想要的？还是我的做法完全错误？

（也可以把“自己”放在左边，最早的一代放在右边，这样会更好。）

Answer 1

您可以重新排列 HTML，并进行一些 css 调整（即交换顶部和底部填充、交换顶部和底部位置并更改边框半径以匹配新排列）有效：

.tree ul {
  padding: 0 0 20px;
  position: relative;
}

.tree li {
  display: inline-block;
  white-space: nowrap;
  vertical-align: bottom;
  margin: 0 -2px 0 -2px;
  text-align: center;
  list-style-type: none;
  position: relative;
  padding: 0 5px 20px 5px;
}


/*We will use ::before and ::after to draw the connectors*/

.tree li::before,
.tree li::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 50%;
  border-bottom: 1px solid #ccc;
  width: 50%;
  height: 20px;
}

.tree li::after {
  right: auto;
  left: 50%;
  border-left: 1px solid #ccc;
}


/*We need to remove left-right connectors from elements without 
any siblings*/

.tree li:only-child::after,
.tree li:only-child::before {
  display: none;
}


/*Remove space from the top of single children*/

.tree li:only-child {
  padding: 0;
}


/*Remove left connector from first child and 
right connector from last child*/

.tree li:first-child::before,
.tree li:last-child::after {
  border: 0 none;
}


/*Adding back the vertical connector to the last nodes*/

.tree li:last-child::before {
  border-right: 1px solid #ccc;
  border-radius: 0 0 5px 0;
  -webkit-border-radius: 0 0 5px 0;
  -moz-border-radius: 0 0 5px 0;
}

.tree li:first-child::after {
  border-radius: 0 0 0 5px;
  -webkit-border-radius: 0 0 0 5px;
  -moz-border-radius: 0 0 0 5px;
}


/*Time to add downward connectors from parents*/

.tree ul ul::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  border-left: 1px solid #ccc;
  width: 0;
  height: 20px;
}

.tree li a {
  border: 1px solid #ccc;
  padding: 5px 10px;
  text-decoration: none;
  color: #666;
  font-family: arial, verdana, tahoma;
  font-size: 11px;
  display: inline-block;
  border-radius: 5px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
}

<div class="tree">
  <ul>
    <li>
      <ul>
        <li>
          <ul>
            <li><a href="#">Grandfather</a></li>
            <li><a href="#">Grandmother</a></li>
          </ul>
          <a href="#">Father</a>
        </li>
        <li>
          <ul>
            <li><a href="#">Grandfather</a></li>
            <li><a href="#">Grandmother</a></li>
          </ul>
          <a href="#">Mother</a>
        </li>
      </ul>
      <a href="#">Self</a>
    </li>
  </ul>
</div>

此外，这里有一个 jsfiddle，其中包含来自代码播放器网站的（反向）原始树。

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