Question

我想计算表中“ TR”列的平均值，但无法使用jquery进行计算。

我的jquery代码：

 table = $("#beyannameTable").DataTable(
             {
                dom: 'Bfrtip',
                buttons: ['excel', 'print'],
                lengthChange: false,
                searching: false,
                paging: false,

                "ajax": {
                    "url": "/Raporlama/ITH_Operasyon",
                    "type": "GET",
                    "datatype": "json",
                    data: { tescilTrh1: $("#tescilTrh1").val(), tescilTrh2: $("#tescilTrh2").val() },
                },

                "columns": [
                    { "data": "Kullanici" },
                    { "data": "Ref" },
                    { "data": "Tescil_No" },
                    { "data": "UNVAN" },
                    { "data": "TescilTarihi" },
                    { "data": "GumrukAdi" },
                    { "data": "Cekildi_Tarih" },
                    { "data": "GumrukEvraklar_Tarih" },
                    { "data": "TR" }
                ]
            });

Answer 1

您可以使用.column().data()方法访问所需的列数据。如果您需要根据可见行动态地重新计算列平均值，则可以使用选择器修饰符{search: 'applied'}作为.column()中的第二个参数，并使用选项drawCallback来对每个列调用平均值重新计算重新绘制。

请在该方法的演示下方结帐：

//sample source data
const srcData = [
  {id: 1, name: 'Steve', age: 24},
  {id: 2, name: 'Chris', age: 31},
  {id: 3, name: 'Martha', age: 28},
  {id: 4, name: 'Sam', age: 33}
];
//DataTables initialization
$('#mytable').DataTable({
  dom: 'ft',
  data: srcData,
  columns: [
    {title: 'id', data: 'id'},
    {title: 'name', data: 'name'},
    {title: 'age', data: 'age'}
  ],
  drawCallback: () => $('#avgage').text(avgAge())
});
//average age calculation
function avgAge() {
  let columnData = $('#mytable').DataTable().column(2,{search:'applied'}).data().toArray();
  return Math.round(columnData.reduce((sum, item) => sum+=item)/columnData.length);
};
//Append <tfoot>
$('#mytable').append(`<tfoot><tr><td colspan="3">Average age: <span id="avgage">${avgAge()}</span></td></tr></tfoot>`);

<!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>
<table id="mytable"></table>
</body>
</html>

如何计算表格中TR列的平均值？

1 个答案: