在 JS 中滚动到视图

Question

我有一个HTML代码，有一个大table。我需要滚动才能访问所有行。

然后我将 thead 设为粘性标签。因为我到处都需要这个标签。 (position: sticky; top: 0;)

但是，当我想在 JavaScript 中使用 firstCell.scrollIntoView(); 时，firstCell 将被 thead 覆盖！

您可以在 this link

中查看示例

在此示例中，Target 是 Table 中的第一个 cell，并且通过单击按钮，它必须滚动到 Target 的视图中

但是 Target 会在 thead

的后面

我该如何解决这个问题？

Answer 1

滚动到视图后，检查头部底部是否与目标顶部重叠 getBoundingClientRects。如果是，则调用 window.scrollBy 差值。

const headTr = document.querySelector('thead tr');
document.querySelector('button').addEventListener('click', () => {
  const target = document.getElementById('target');
  target.scrollIntoView();
  const diff = target.getBoundingClientRect().top - target.getBoundingClientRect().bottom;
  if (diff < 0) {
    window.scrollBy(0, diff);
  }
});

<button style="position: fixed; top: 5px; right: 5px;">ScrollIntoView (for Target)</button>
<table>
  <thead>
    <tr style='position: sticky; top: 0;'>
      <td>XYZ</td>
      <td>XYZ</td>
      <td>XYZ</td>
      <td>XYZ</td>
      <td>XYZ</td>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td id=target style="color: red;">Target</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    <tr>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
      <td>abc</td>
    </tr>
    </tr>
  </tbody>
</table>

Answer 2

由于 thead 有一个固定位置，在计算可用 space 时不会考虑它的大小。

解决方法是使用 scrollIntoView({ behavior: 'smooth', block: 'end' }) 代替 scrollIntoView()。

这只有效，因为 thead 的高度等于 tr 的高度，所以如果它使滚动条与底部对齐，它就不会再被覆盖。

在 JS 中滚动到视图

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