使用数据表页脚回调的多列总数

Question

我正在尝试使用包含数值的多列实现数据table。

我想在 table 页脚中显示每列的总和。

我从here中得到了一些启发。

Answer 1

以下是专注于在页脚行中创建多列总计的最小解决方案。您需要重新应用 CSS、复选框和整体 HTML 结构：

$(document).ready(function() {

  var table = $('#example').DataTable( {
    initComplete: function(settings, json) {
      // calculate the sum when table is first created:
      doSum();
    }
  } );

  $('#example').on( 'draw.dt', function () {
    // re-calculate the sum whenever the table is re-displayed:
    doSum();
  } );

  // This provides the sum of all records:
  function doSum() {
    // get the DataTables API object:
    var table = $('#example').DataTable();
    // set up the initial (unsummed) data array for the footer row:
    var totals = ['','Totals',0,0,0,0,0,0,0,''];
    // iterate all rows - use table.rows( {search: 'applied'} ).data()
    // if you want to sum only filtered (visible) rows:
    totals = table.rows( ).data()
      // sum the amounts:
      .reduce( function ( sum, record ) {
        for (let i = 2; i <= 8; i++) {
          sum[i] = sum[i] + numberFromString(record[i]);
        } 
        return sum;
      }, totals ); 
    // place the sum in the relevant footer cell:
    for (let i = 1; i <= 8; i++) {
      var column = table.column( i );
      $( column.footer() ).html( formatNumber(totals[i]) );
    }
  }

  function numberFromString(s) {
    return typeof s === 'string' ?
      s.replace(/[$,]/g, '') * 1 :
      typeof s === 'number' ?
      s : 0;
  }

  function formatNumber(n) {
     return n.toLocaleString(); // or whatever you prefer here
  }

} );

<!doctype html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Demo</title>
  <script src="https://code.jquery.com/jquery-3.5.0.js"></script>
  <script src="https://cdn.datatables.net/1.10.22/js/jquery.dataTables.js"></script>
  <link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/1.10.22/css/jquery.dataTables.css">
  <link rel="stylesheet" type="text/css" href="https://datatables.net/media/css/site-examples.css">

</head>

<body>

<div style="margin: 20px;">

    <table id="example" class="display dataTable cell-border" style="width:100%">
                                                <thead>
        <tr>
            <th class="text-center"><input type="checkbox" class="selectAll" name="selectAll" value="all"></th>
            <th>ID</th>
            <th>Fee1</th>
            <th>Fee2</th>
            <th>Fee3</th>
            <th>Fee4</th>
            <th>Fee5</th>
            <th>Fee6</th>
            <th>Sub Total</th>
            <th>Copy</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td></td>
            <td>AF-01</td>
            <td>100,001</td>
            <td>100,002</td>
            <td>100,003</td>
            <td>100,004</td>
            <td>100,005</td>
            <td>100,006</td>
            <td>100,007</td>
            <td></td>
        </tr>
        <tr>
              <td></td>
              <td>AF-01</td>
              <td>100,000</td>
              <td>100,000</td>
              <td>100,000</td>
              <td>100,000</td>
              <td>100,000</td>
              <td>100,000</td>
              <td>100,000</td>
              <td></td>
          </tr>
    </tbody>
  <tfoot>
            <tr>
                <th></th>
                <th></th>
                <th></th>
                <th></th>
                <th></th>
                <th></th>
                <th></th>
                <th></th>
                <th></th>
                <th></th>
            </tr>
        </tfoot>
    </table>

</div>



</body>
</html>

我在代码中添加了注释 - 但有一点需要注意：如果您想调整总和以使其反映可见（未过滤）数据，您可以替换为：

table.rows( ).data()

有了这个：

table.rows( {search: 'applied'} ).data()

使用数据表页脚回调的多列总数

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