css - 使用第 n 个类型的计数器

Question

是否有可能有这样的计数器nth-type：

td:nth-of-type(counter(section)):before { 
     content: "Date"counter(section); 
     counter-increment: section;
}

计数器初始化为

#myTable  tr { 
    border: 1px solid #ccc; 
    counter-reset: section;counter-increment: section;
}

我正在尝试做的是 - 检查是否tr有类 iR，如果有，结构如下所示：

table.myTable td:nth-of-type(1):before { content: "Date"; }
table.myTable td:nth-of-type(2):before { content: "Fajr"; }
table.myTable td:nth-of-type(3):before { content: "Fr"; }
table.myTable td :nth-of-type(4):before { content: "Se"; }
table.myTable td:nth-of-type(5):before { content: "Dr"; }
table.myTable td:nth-of-type(6):before { content: " "; }
table.myTable td:nth-of-type(7):before { content: "A"; }
table.myTable td:nth-of-type(8):before { content: " "; }
table.myTable td:nth-of-type(9):before { content: "Mb"; }
table.myTable td:nth-of-type(10):before { content: " "; }
table.myTable td:nth-of-type(11):before { content: "I"; }
table.myTable td:nth-of-type(12):before { content: ""; }

如果不是它会是这样的

table.myTable td:nth-of-type(1):before { content: "Date"; }
table.myTable td:nth-of-type(2):before { content: "Fr"; }
table.myTable td :nth-of-type(3):before { content: "Se"; }
table.myTable td:nth-of-type(4):before { content: "Dr"; }
table.myTable td:nth-of-type(5):before { content: "A"; }
table.myTable td:nth-of-type(6):before { content: "Mb"; }
table.myTable td:nth-of-type(7):before { content: "I"; }

这是 jsfiddle 我试图做的事情 https://jsfiddle.net/wj5gnafm/1/

Answer 1

根据现在提供的小提琴，您甚至不需要counter. 您应该能够通过使用我在原始答案中提到的类和否定选择器来实现这一点。下面是一个示例片段。

td {
  border: 1px solid;
}
table tr.iRow td:nth-of-type(1):before {
  content: 'Date ';
}
table tr.iRow td:nth-of-type(2):before {
  content: 'Fr ';
}
table tr.iRow td:nth-of-type(3):before {
  content: '';
}
table tr.iRow td:nth-of-type(4):before {
  content: 'Se ';
}
table tr.iRow td:nth-of-type(5):before {
  content: 'Dr ';
}
table tr.iRow td:nth-of-type(6):before {
  content: '';
}
table tr.iRow td:nth-of-type(7):before {
  content: 'A ';
}
table tr.iRow td:nth-of-type(8):before {
  content: '';
}
table tr.iRow td:nth-of-type(9):before {
  content: 'Mb ';
}
table tr.iRow td:nth-of-type(10):before {
  content: '';
}
table tr.iRow td:nth-of-type(11):before {
  content: 'I ';
}
table tr.iRow td:nth-of-type(12):before {
  content: '';
}
table tr:not(.iRow) td:nth-of-type(1):before {
  content: 'Date ';
}
table tr:not(.iRow) td:nth-of-type(2):before {
  content: 'Fr ';
}
table tr:not(.iRow) td:nth-of-type(3):before {
  content: 'Se ';
}
table tr:not(.iRow) td:nth-of-type(4):before {
  content: 'Dr ';
}
table tr:not(.iRow) td:nth-of-type(5):before {
  content: 'A ';
}
table tr:not(.iRow) td:nth-of-type(6):before {
  content: 'Mb ';
}
table tr:not(.iRow) td:nth-of-type(7):before {
  content: 'I ';
}

<table>
  <tr class='iRow'>
    <td>A</td>
    <td>B</td>
    <td>C</td>
    <td>D</td>
    <td>E</td>
    <td>F</td>
    <td>G</td>
    <td>H</td>
    <td>I</td>
    <td>J</td>
    <td>K</td>
    <td>L</td>
  </tr>
  <tr>
    <td>A</td>
    <td>B</td>
    <td>C</td>
    <td>D</td>
    <td>E</td>
    <td>E</td>
    <td>E</td>
  </tr>
</table>

---

原始问题的答案：

正如我在对该问题的评论中提到的，您不能将计数器的值作为参数传递给nth-of-type（或任何其他nth-*）选择器。

您可以通过counter-increment仅在所需的类存在时（通过使用类选择器）并使用:not([classname])来增加另一个计数器来实现您的预​​期输出。

显示值时，使用选择器中的类或类否定，然后根据需要显示值。下面是一个示例片段。

table {
  counter-reset: section, section-other;
}
table, tr, td {
  border: 1px solid;
}
table tr.iRow {
  counter-increment: section;
  background: sandybrown; /* just for distinction */
}
table .iRow td:nth-of-type(1):before {
  content: "Foo." counter(section)" ";
}
table .iRow td:nth-of-type(2):before {
  content: "Bar." counter(section)" ";
}
table .iRow td:nth-of-type(3):before {
  content: "Baz." counter(section)" ";
}
table tr:not(.iRow) {
  counter-increment: section-other;
  background: wheat; /* just for distinction */
}
table tr:not(.iRow) td:nth-of-type(1):before {
  content: "ooF." counter(section-other)" ";
}
table tr:not(.iRow) td:nth-of-type(2):before {
  content: "raB." counter(section-other)" ";
}
table tr:not(.iRow) td:nth-of-type(3):before {
  content: "zaB." counter(section-other)" ";
}

<table>
  <tr class='iRow'>
    <td>A</td><td>B</td><td>C</td>
  </tr>
  <tr class='iRow'>
    <td>A</td><td>B</td><td>C</td>
  </tr>
  <tr>
    <td>A</td><td>B</td><td>C</td>  
  </tr>
  <tr class='iRow'>
    <td>A</td><td>B</td><td>C</td>  
  </tr>
  <tr>
    <td>A</td><td>B</td><td>C</td>  
  </tr>
  <tr class='iRow'>
    <td>A</td><td>B</td><td>C</td>  
  </tr>
  <tr>
    <td>A</td><td>B</td><td>C</td>  
  </tr>
  <tr>
    <td>A</td><td>B</td><td>C</td>  
  </tr>
</table>