tbodyのCSSテーブル読み込みオーバーレイ

Question

Tbodyの高さのみに対してこのテーブル読み込みオーバーレイを作成する方法：

table.loading {
    position: relative;
}
table.loading:after {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.1);
    background-image: url(../images/loading.gif);
    background-position: center;
    background-repeat: no-repeat;
    background-size: 50px 50px;
    content: "";
}

タグtbodyに「table-row-group」という表示があり、CSSからtbodyの高さを取得できません。

table {
  width: 100%;
}
table.loading {
  position: relative;
}
table.loading:after {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.1);
  background-image: url(data:image/gif;base64,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  background-position: center;
  background-repeat: no-repeat;
  background-size: 50px 50px;
  content: "";
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
  <thead>
    <tr>
      <th>Col 1</th>
      <th>Col 2</th>
      <th>Col 3</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>1x1</td>
      <td>1x2</td>
      <td>1x3</td>
    </tr>
    <tr>
      <td>2x1</td>
      <td>2x2</td>
      <td>2x3</td>
    </tr>
    <tr>
      <td>3x1</td>
      <td>3x2</td>
      <td>3x3</td>
    </tr>
  </tbody>
</table>
<br /><br />
<button onClick="$('table').addClass('loading')">Loading</button>

Answer 1

CSS 2.1仕様 から：

'position：relative'のtable-row-group、table-header-group、table-footer-groupへの影響、テーブル行、テーブル列グループ、テーブル列、テーブルセル、テーブルキャプションの要素は定義されていません。

可能な解決策：

• セットする display:table;tbodyおよびthead要素
• 適用position:relative;をtbody要素ではなくtable要素に
• :aftertableからtbodyまでの擬似要素。これにより、tbody要素の高さの100％を占めるようになります。

更新されたPlunker：https://plnkr.co/edit/qOwmd9xJvwYdJ37wsKWX?p=preview

Answer 2

テーブル内にオーバーレイを挿入し、それはテーブルに対して相対的に配置されています。

Tbodyに対して相対的に配置したい場合は、セレクターを

table.loading > tbody { /* ... */ }
table.loading > tbody:after { /* ... */}

table {
  width: 100%;
}
table.loading > tbody {
  position: relative;
}
table.loading > tbody:after {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.1);
  background-image: 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);
  background-position: center;
  background-repeat: no-repeat;
  background-size: 50px 50px;
  content: "";
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
  <thead>
    <tr>
      <th>Col 1</th>
      <th>Col 2</th>
      <th>Col 3</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>1x1</td>
      <td>1x2</td>
      <td>1x3</td>
    </tr>
    <tr>
      <td>2x1</td>
      <td>2x2</td>
      <td>2x3</td>
    </tr>
    <tr>
      <td>3x1</td>
      <td>3x2</td>
      <td>3x3</td>
    </tr>
  </tbody>
</table>
<br /><br />
<button onClick="$('table').addClass('loading')">Loading</button>

position: relativeに対するtable-row-groupの動作がCSS2.1で定義されていないため、これは一部のブラウザでは機能しない可能性があります。ただし、 CSS配置済みレイアウトモジュールレベル はそのナンセンスを削除し、Firefoxのような準拠ブラウザーがあれば動作するようになりました。