表格标题位置：粘性和边框问题

Question

在 这篇文章 之后，我有一个表格，我正在尝试获取粘性标题。除了我的表格样式在顶部和底部有带边框的标题。

我不明白的部分是应用于 th 的顶部/底部边框与表格的其余部分一起滚动，而不是留在“卡住”的标题单元格中。有什么可以做的吗？

可以在此处找到工作示例： https ://codepen.io/smlombardi/pen/MNKqQY?editors=1100#0

 let string = ''
console.log("oj")
for(let i=0; i<100; i++) {
  string += `
        <tr>
          <td>Malcolm Reynolds</td>
          <td>Captain</td>
          <td>9035749867</td>
          <td>mreynolds</td>
        </tr>
  `
}
document.getElementsByTagName('tbody')[0].innerHTML += string

 .table-sticky-container {
  height: 200px;
  overflow-y: scroll;
  border-top: 1px solid green;
  border-bottom: 1px solid green;
}

.table-sticky {

  th {
    position: sticky;
    top: 0;
    z-index: 2;
    border-top: 1px solid red !important;
    border-bottom: 2px solid red !important;
  }
}

 <div class="table-sticky-container">
  <table class="table table-sticky">
    <thead class="thead-light">
      <tr>
        <th scope="col">Name</th>
        <th scope="col">Title</th>
        <th scope="col">ID</th>
        <th scope="col">Username</th>
      </tr>
    </thead>
    <tbody>
      <tr>
          <td>Malcolm Reynolds</td>
          <td>Captain</td>
          <td>9035749867</td>
          <td>mreynolds</td>
        </tr>
    </tbody>
  </table>
</div>

原文由 Steve 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

你可以加

.table {
  border-collapse: separate;
}

但不幸的是，它看起来很糟糕，更好的解决方案是使用伪元素添加变通方法。

 th:after,
th:before {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
}

th:before {
  top: -1px;
  border-top: 1px solid red;
}

th:after {
  bottom: -1px;
  border-bottom: 2px solid red;
}

 .table-sticky-container {
  height: 200px;
  overflow-y: scroll;
  border-top: 1px solid green;
  border-bottom: 1px solid green;
}

.table-sticky th {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 2;
}

th:after,
th:before {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
}

th:before {
  top: -1px;
  border-top: 1px solid red;
}

th:after {
  bottom: -1px;
  border-bottom: 2px solid red;
}

 <link rel='stylesheet' href='https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css'>

<div class="table-sticky-container">
    <table class="table table-sticky">
      <thead class="thead-light">
        <tr>
          <th scope="col">Name</th>
          <th scope="col">Title</th>
          <th scope="col">ID</th>
          <th scope="col">Username</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>Malcolm Reynolds</td>
          <td>Captain</td>
          <td>9035749867</td>
          <td>mreynolds</td>
        </tr>
        <tr>
          <td>Zoe Washburne</td>
          <td>First Officer</td>
          <td>8908980980</td>
          <td>zwashburne</td>
        </tr>
        <tr>
          <td>Kaylee Frye</td>
          <td>Engineer</td>
          <td>6678687678</td>
          <td>kfrye</td>
        </tr>
        <tr>
          <td>Malcolm Reynolds</td>
          <td>Captain</td>
          <td>9035749867</td>
          <td>mreynolds</td>
        </tr>
        <tr>
          <td>Zoe Washburne</td>
          <td>First Officer</td>
          <td>8908980980</td>
          <td>zwashburne</td>
        </tr>
        <tr>
          <td>Kaylee Frye</td>
          <td>Engineer</td>
          <td>6678687678</td>
          <td>kfrye</td>
        </tr>
      </tbody>
    </table>
  </div>

第二种解决方案

.table {
  border-collapse: collapse;
}

.table-sticky thead th {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 2;
  box-shadow: inset 0 1px 0 red, inset 0 -2px 0 red;
}

原文由 Grzegorz T. 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 2

你可以加

.table {
  border-collapse: separate;
  border-spacing: 0;
}

原文由 SarthakC 发布，翻译遵循 CC BY-SA 4.0 许可协议