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
This question has been asked before but as an absolute beginner with JavaScript I don't know how to apply this to my code. 
之前已经问过这个问题，但是作为JavaScript的绝对入门者，我不知道如何将其应用于我的代码。 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. 我希望在表的页脚中同时显示“ G”字段和“ AB”字段的总和。
Here's my code 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>
1 个解决方案
解决方案1
1 已采纳 2019-05-08 15:19:39
I normally do not suggest to populate DataTable with HTML source, I find this way tedious and slow. 我通常不建议用HTML源代码填充DataTable，我觉得这种方式既乏味又缓慢。
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: 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选项来填充您的总计：
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]);
}
Above requires you to append <tfoot> section to the static HTML part you prepare server-side: 上面的要求您将<tfoot>部分附加到准备在服务器端的静态HTML部分：
<tfoot>
<tr>
<th colspan="2">Totals:</th>
<th></th>
<th></th>
</tr>
</tfoot>
So, complete example might look something, like this: 因此，完整的示例可能看起来像这样：
<!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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