html - 一个表格 <td> 宽度基于另一个表格 <td> 使用 html/css 的宽度

Question

我的代码如下。尝试为 DIV 创建一个垂直滚动条，并使我的表头固定，这是有效的。 <强> FIDDLE

但是，table2 的第一列包含动态数据，并且此单元格的宽度会根据正在填充的数据进行调整。

我需要将我的 Head1 宽度(来自 table1)设置为等于 table2 column1 的宽度。

希望有一个简单且更好的方法来实现这一点

<table id="table1">
    <thead>
        <tr>
            <th>Head1</th>
            <th>Head2</th>
            <th>Head3</th>
        </tr>
    </thead>
</table>
<div style="max-height: 200px; overflow: auto;">
    <table id="table2">
        <tbody>
            <tr> <td>Contains Dynamic data</td> <td>content</td> <td>content</td> </tr>
            <tr> <td>content</td> <td>content</td> <td>content</td> </tr>
            <tr> <td>content</td> <td>content</td> <td>content</td> </tr>
            <tr> <td>content</td> <td>content</td> <td>content</td> </tr>
        </tbody>
    </table>
</div>

Answer 1

通过小技巧，我假设您知道列中最长的字符串是什么，如果是这样，您可以将它放到跨度中，它会“扩展”您的标题，但您会隐藏它。

可以使用javascript来实现，搜索特定列中最长的文本，并将其放在该列的头部。

const headerContainers = document.querySelectorAll('#head-row  div');

const maxLengthPerColumn = Array.from(headerContainers).map(_ => '');

Array.from(document.querySelectorAll('#test tr'))
  .forEach((row) => Array.from(row.querySelectorAll('td')).forEach((td, index) => {
    maxLengthPerColumn[index] = maxLengthPerColumn[index].length < td.textContent.length ? td.textContent : maxLengthPerColumn[index];
  }));

maxLengthPerColumn.forEach((longText, index) => {
  const span = document.createElement('span');
  span.textContent = longText;
  headerContainers[index].appendChild(span);
});

thead th div {
  height: 1em;
  overflow: hidden;
  text-align: left;
}

thead th span {
  font-weight: normal;
  display: block;
}

<div>Page content goes here. </div>
<table>
  <thead>
    <tr id="head-row">
      <th>
        <div>Head1</div>
      </th>
      <th>
        <div>Head2</div>
      </th>
      <th>
        <div>Head3</div>
      </th>
    </tr>
  </thead>
</table>
<div style="max-height: 200px; overflow: auto;">
  <table id="test">
    <tbody>
      <tr>
        <td>Contains Dynamic data</td>
        <td>content</td>
        <td>content</td>
      </tr>
      <tr>
        <td>content</td>
        <td>content Longer text</td>
        <td>content</td>
      </tr>
      <tr>
        <td>content</td>
        <td>content</td>
        <td>content</td>
      </tr>
      <tr>
        <td>content</td>
        <td>content</td>
        <td>content</td>
      </tr>
      <tr>
        <td>content</td>
        <td>content</td>
        <td>content</td>
      </tr>
      <tr>
        <td>content</td>
        <td>content</td>
        <td>content</td>
      </tr>
      <tr>
        <td>content</td>
        <td>content</td>
        <td>content</td>
      </tr>
      <tr>
        <td>content</td>
        <td>content</td>
        <td>content</td>
      </tr>
      <tr>
        <td>content</td>
        <td>content</td>
        <td>content</td>
      </tr>
      <tr>
        <td>content</td>
        <td>content</td>
        <td>content</td>
      </tr>
    </tbody>
  </table>
</div>
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