在数据表中添加字段的总和 [英] Adding the sum of a field in Datatables
问题描述
这个问题曾经被问过，但是作为JavaScript的绝对初学者，我不知道如何将其应用于我的代码.我希望在表的页脚中同时显示"G"字段和"AB"字段的总和.
This question has been asked before but as an absolute beginner with JavaScript I don't know how to apply this to my code. I would like the sum for both the 'G' field and sum for the 'AB' field to be displayed in the footer of my table.
这是我的代码
<div align="center">
<table id = 'battingtbl' class="display compact nowrap">
<thead>
<tr>
<th>YEAR</th>
<th>AGE</th>
<th>G</th>
<th>AB</th>
</tr>
</thead>
<tbody>
{% for stat in playerdata.masterbatting_set.all %}
<tr>
<td>{{ stat.year }}</td>
<td>{{ stat.age }}</td>
<td>{{ stat.g }}</td>
<td>{{ stat.ab }}</td>
</tr>
{% endfor %}
</tbody>
</table>
<script>
$(document).ready(function () {
$('#battingtbl').DataTable({
"searching": true,
"pageLength": 40,
"scrollX": true,
"paging": false,
"info": false,
})
});
</script>
推荐答案
我通常不建议使用HTML源代码填充DataTable，我觉得这种方式既乏味又缓慢.
I normally do not suggest to populate DataTable with HTML source, I find this way tedious and slow.
但是，假设您希望在每次重新绘制时重新计算这些总计(表过滤)，我建议使用 drawCallback 选项来填充总计:
However, assuming you want those totals to get recalculated upon each re-draw (table filtering), I'd suggest to employ drawCallback option to populate your totals:
drawCallback: () => {
// grab DataTables insurance into the variable
const table = $('#battingtbl').DataTable();
// extract all the data for all visible columns
const tableData = table.rows({search:'applied'}).data().toArray();
// summarize row data for columns 3,4 (indexes 2, 3)
const totals = tableData.reduce((total, rowData) => {
total[0] += parseFloat(rowData[2]);
total[1] += parseFloat(rowData[3]);
return total;
// starting point for reduce() totals for 2 columns equal to zero each
}, [0,0]);
// populate footer cells for columns 3, 4 (indexes 2, 3) with corresponding array total
$(table.column(2).footer()).text(totals[0]);
$(table.column(3).footer()).text(totals[1]);
}
以上要求您将<tfoot>部分附加到您准备在服务器端准备的静态HTML部分:
Above requires you to append <tfoot> section to the static HTML part you prepare server-side:
<tfoot>
<tr>
<th colspan="2">Totals:</th>
<th></th>
<th></th>
</tr>
</tfoot>
因此，完整的示例可能看起来像这样:
So, complete example might look something, like this:
<!doctype html>
<html>
<head>
<script type="application/javascript" src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script type="application/javascript" src="https://cdn.datatables.net/1.10.19/js/jquery.dataTables.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/1.10.19/css/jquery.dataTables.min.css">
</head>
<body>
<div align="center">
<table id = 'battingtbl' class="display compact nowrap">
<thead>
<tr>
<th>YEAR</th>
<th>AGE</th>
<th>G</th>
<th>AB</th>
</tr>
</thead>
<tbody>
<tr>
<td>2016</td>
<td>24</td>
<td>15</td>
<td>6</td>
</tr>
<tr>
<td>2018</td>
<td>32</td>
<td>5</td>
<td>7</td>
</tr>
<tr>
<td>2016</td>
<td>28</td>
<td>14</td>
<td>9</td>
</tr>
<tr>
<td>2015</td>
<td>25</td>
<td>9</td>
<td>7</td>
</tr>
</tbody>
<tfoot>
<tr>
<th colspan="2">Totals:</th>
<th></th>
<th></th>
</tr>
</tfoot>
</table>
<script>
$(document).ready(function () {
$('#battingtbl').DataTable({
"searching": true,
"pageLength": 40,
"scrollX": true,
"paging": false,
"info": false,
drawCallback: () => {
const table = $('#battingtbl').DataTable();
const tableData = table.rows({
search: 'applied'
}).data().toArray();
const totals = tableData.reduce((total, rowData) => {
total[0] += parseFloat(rowData[2]);
total[1] += parseFloat(rowData[3]);
return total;
}, [0, 0]);
$(table.column(2).footer()).text(totals[0]);
$(table.column(3).footer()).text(totals[1]);
}
})
});
</script>
</body>
</html>
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