结果分页时如何在数据表中实现行计数？

Question

我使用 DataTables 对包含用户数据的表进行分页和排序。

完整的数据集通过 .NET 应用程序来自 MySQL 数据库。

表的第一列必须包含（当前）行计数，以使计数“免疫”重新排列行（换句话说，排序）。这就是我使用基于 CSS 的行计数的原因，如下所示：

new DataTable('#employees', {
  info: false,
  paging: true,
  "aLengthMenu": [5, 10, 20],
  // "dom": 'rtip',
});

.dt-column-order:before {
  margin-bottom: 1px;
}

th {
  outline: none !important;
}

.dt-paging {
  margin-top: 15px !important;
}

.pagination {
  justify-content: flex-end;
}

/* CSS row count */
table {
  counter-reset: row-num;
}

table tbody tr {
  counter-increment: row-num;
}

table tbody tr td:first-child::before {
  content: counter(row-num) "";
}

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.slim.min.js"></script>
<script src="https://cdn.datatables.net/2.1.8/js/dataTables.min.js"></script>
<script src="https://cdn.datatables.net/2.1.8/js/dataTables.bootstrap5.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
<link href="https://cdn.datatables.net/2.1.8/css/dataTables.bootstrap5.min.css" rel="stylesheet" />

<div class="container-fluid my-2">
  <h2>Data Tables</h2>
  <table id="employees" class="table table-bordered table-striped mx-1">
    <thead>
      <tr>
        <th>No</th>
        <th>Name</th>
        <th>Position</th>
        <th>Office</th>
        <th>Age</th>
        <th>Start date</th>
        <th>Salary</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td></td>
        <td>Tiger Nixon</td>
        <td>System Architect</td>
        <td>Edinburgh</td>
        <td>61</td>
        <td>2011-04-25</td>
        <td>$320,800</td>
      </tr>
      <tr>
        <td></td>
        <td>Garrett Winters</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>63</td>
        <td>2011-07-25</td>
        <td>$170,750</td>
      </tr>
      <tr>
        <td></td>
        <td>Ashton Cox</td>
        <td>Junior Technical Author</td>
        <td>San Francisco</td>
        <td>66</td>
        <td>2009-01-12</td>
        <td>$86,000</td>
      </tr>
      <tr>
        <td></td>
        <td>Cedric Kelly</td>
        <td>Senior Javascript Developer</td>
        <td>Edinburgh</td>
        <td>22</td>
        <td>2012-03-29</td>
        <td>$433,060</td>
      </tr>
      <tr>
        <td></td>
        <td>Ștefan Popa</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>33</td>
        <td>2008-11-28</td>
        <td>$162,700</td>
      </tr>
      <tr>
        <td></td>
        <td>Brielle Williamson</td>
        <td>Integration Specialist</td>
        <td>New York</td>
        <td>61</td>
        <td>2012-12-02</td>
        <td>$372,000</td>
      </tr>
      <tr>
        <td></td>
        <td>Herrod Chandler</td>
        <td>Sales Assistant</td>
        <td>San Francisco</td>
        <td>59</td>
        <td>2012-08-06</td>
        <td>$137,500</td>
      </tr>
      <tr>
        <td></td>
        <td>Rhona Davidson</td>
        <td>Integration Specialist</td>
        <td>Tokyo</td>
        <td>55</td>
        <td>2010-10-14</td>
        <td>$327,900</td>
      </tr>
      <tr>
        <td></td>
        <td>Colleen Hurst</td>
        <td>Javascript Developer</td>
        <td>San Francisco</td>
        <td>39</td>
        <td>2009-09-15</td>
        <td>$205,500</td>
      </tr>
      <tr>
        <td></td>
        <td>Sonya Frost</td>
        <td>Software Engineer</td>
        <td>Edinburgh</td>
        <td>23</td>
        <td>2008-12-13</td>
        <td>$103,600</td>
      </tr>
      <tr>
        <td></td>
        <td>Jena Gaines</td>
        <td>Office Manager</td>
        <td>London</td>
        <td>30</td>
        <td>2008-12-19</td>
        <td>$90,560</td>
      </tr>
      <tr>
        <td></td>
        <td>Quinn Flynn</td>
        <td>Support Lead</td>
        <td>Edinburgh</td>
        <td>22</td>
        <td>2013-03-03</td>
        <td>$342,000</td>
      </tr>
    </tbody>
  </table>
</div>

这个解决方案有一个问题：每当结果集足够大以至于需要分页时，每页的行数都会从 1 开始。

所以，我实际上需要基于 JavaScript 的行计数，这不会重置每个页面的计数。我没有找到一种方法可以将其插入到数据表中。

问题

有内置的 DataTables 解决方案吗？
如果没有，解决问题的可行方案是什么？

Answer 1

在示例中，事件侦听器被添加到

document

，因为 

<table>

 以及层次结构中更高的元素可能被销毁和创建。无论如何，尝试获取正确的页面并通过查找当前位于 

<button>

 中的 

<li class="active">

 来获取索引号是很棘手的。现在正确的索引是正确的，我使用了一个包含 3 个数字的数组，这 3 个数字是每页的起始行号。最后，我得到了一个 CSS 变量 

--start

 来更改 

counter-set

 的值，这也是分配给 

counter-reset

 的 

<table>

 的第二个值。因此，每次页面更改时，该值都会从 0 更改为 5，再更改为 10。

new DataTable('#employees', {
  info: false,
  paging: true,
  "aLengthMenu": [5, 10, 20],
  // "dom": 'rtip',
});

document.addEventListener("click", adjCounters);

function adjCounters(e) {
  const clk = e.target;

  if (clk.matches("button")) {
    const act = document.querySelector(".active .page-link")
    const ref = [0, 5, 10];
    const idx = Number(act.getAttribute("data-dt-idx"));
    act.style.cssText += "outline:3px red dashed";
    console.log(idx)
    const pgs = ref[idx];

    const table = document.querySelector("table");
    table.style.setProperty("--start", pgs);
  }
}

:root {
  --start: 0
}

.dt-layout-full {
  padding: 0 !important;
}

.dt-column-order:before {
  margin-bottom: 1px;
}

th {
  outline: none !important;
}

.dt-paging {
  margin-top: 15px !important;
}

.pagination {
  justify-content: flex-end;
}

/* CSS row count */
table {
  counter-reset: row-num var(--start)
}

table tbody tr {
  counter-increment: row-num;
}

table tbody tr td:first-child::before {
  content: counter(row-num) "";
}

.as-console-wrapper {
  left: auto !important;
  top: 0;
  width: 60%;
}

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.slim.min.js"></script>
<script src="https://cdn.datatables.net/2.1.8/js/dataTables.min.js"></script>
<script src="https://cdn.datatables.net/2.1.8/js/dataTables.bootstrap5.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
<link href="https://cdn.datatables.net/2.1.8/css/dataTables.bootstrap5.min.css" rel="stylesheet" />

<div class="container-fluid my-2">
  <h2>Data Tables</h2>
  <table id="employees" class="table table-bordered table-striped mx-1">
    <thead>
      <tr>
        <th>No</th>
        <th>Name</th>
        <th>Position</th>
        <th>Office</th>
        <th>Age</th>
        <th>Start date</th>
        <th>Salary</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td></td>
        <td>Tiger Nixon</td>
        <td>System Architect</td>
        <td>Edinburgh</td>
        <td>61</td>
        <td>2011-04-25</td>
        <td>$320,800</td>
      </tr>
      <tr>
        <td></td>
        <td>Garrett Winters</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>63</td>
        <td>2011-07-25</td>
        <td>$170,750</td>
      </tr>
      <tr>
        <td></td>
        <td>Ashton Cox</td>
        <td>Junior Technical Author</td>
        <td>San Francisco</td>
        <td>66</td>
        <td>2009-01-12</td>
        <td>$86,000</td>
      </tr>
      <tr>
        <td></td>
        <td>Cedric Kelly</td>
        <td>Senior Javascript Developer</td>
        <td>Edinburgh</td>
        <td>22</td>
        <td>2012-03-29</td>
        <td>$433,060</td>
      </tr>
      <tr>
        <td></td>
        <td>Ștefan Popa</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>33</td>
        <td>2008-11-28</td>
        <td>$162,700</td>
      </tr>
      <tr>
        <td></td>
        <td>Brielle Williamson</td>
        <td>Integration Specialist</td>
        <td>New York</td>
        <td>61</td>
        <td>2012-12-02</td>
        <td>$372,000</td>
      </tr>
      <tr>
        <td></td>
        <td>Herrod Chandler</td>
        <td>Sales Assistant</td>
        <td>San Francisco</td>
        <td>59</td>
        <td>2012-08-06</td>
        <td>$137,500</td>
      </tr>
      <tr>
        <td></td>
        <td>Rhona Davidson</td>
        <td>Integration Specialist</td>
        <td>Tokyo</td>
        <td>55</td>
        <td>2010-10-14</td>
        <td>$327,900</td>
      </tr>
      <tr>
        <td></td>
        <td>Colleen Hurst</td>
        <td>Javascript Developer</td>
        <td>San Francisco</td>
        <td>39</td>
        <td>2009-09-15</td>
        <td>$205,500</td>
      </tr>
      <tr>
        <td></td>
        <td>Sonya Frost</td>
        <td>Software Engineer</td>
        <td>Edinburgh</td>
        <td>23</td>
        <td>2008-12-13</td>
        <td>$103,600</td>
      </tr>
      <tr>
        <td></td>
        <td>Jena Gaines</td>
        <td>Office Manager</td>
        <td>London</td>
        <td>30</td>
        <td>2008-12-19</td>
        <td>$90,560</td>
      </tr>
      <tr>
        <td></td>
        <td>Quinn Flynn</td>
        <td>Support Lead</td>
        <td>Edinburgh</td>
        <td>22</td>
        <td>2013-03-03</td>
        <td>$342,000</td>
      </tr>
    </tbody>
  </table>
</div>