如何动态更新数据表中的单元格？

Question

我正在使用this数据表。

我的代码如下所示

table = $('#invoices-table').DataTable({ ordering: false });
var currentPage = table.page();

rowNode = table.row.add([
    table_sr_no,
    '<a href="/view_debit_notes/' + data.id + '" class="view_debit_notes">' + data.debitnote_no + '</a>',
    '<td class="text-right">' + data.total + '</td>',
    'Serial No',
    '',
    '<a href="/seller/number">Active</a>',
    ''
]).draw();

var index = 0,
rowCount = table.data().length - 1,
insertedRow = table.row(rowCount).data(),
tempRow;

for (var i = rowCount; i > index; i--) {
    tempRow = table.row(i - 1).data();
    table.row(i).data(tempRow);
    table.row(i - 1).data(insertedRow);
}

table.page(currentPage).draw(false);

我正在使用以下代码在先前生成的表中的第一位置插入一行。

rowNode = table.row.add([
        table_sr_no,
        '<a href="/view_debit_notes/' + data.id + '" class="view_debit_notes">' + data.debitnote_no + '</a>',
        '<td class="text-right">' + data.total + '</td>',
        'Serial No',
        '',
        '<a href="/seller/number">Active</a>',
        ''
    ]).draw();

我认为我必须在下面的代码中做一些事情才能重新生成新序列号

for (var i = rowCount; i > index; i--) {
    tempRow = table.row(i - 1).data();
    table.row(i).data(tempRow);
    table.row(i - 1).data(insertedRow);
}

如何动态生成序列号（ table_sr_no ）？

我需要序列号，如下所示：

Answer 1

根据您的评论，我的理解是，您希望第一列或多或少像自动递增一样起作用，其中每个单元格包含一个引用其在表中位置的数字。您可以像这样将每行的第一个单元格设置为其父行的索引：

// select first cell in every row and iterate over them
$('#invoices-table tr td:first-child').each( function() {
    // get a reference to the datatable's cell and assign
    // the parent row's index as content
    table.cell(this).data($(this).parent().index()+1);
});
// redraw the table so new cell data will work with sorting and filtering
table.draw();

更新：

我将在此处提供另一种解决方案，因为我意识到上述操作将在分页/行当前不可见的表上失败。数据表提供了自己的each()方法，可以在集合中的节点上调用该方法。要使用它，您可以执行以下操作：

table.cells(':first-child').nodes().each(function(node, index) {
    table.cell(node).data(index + 1);
});

您会注意到，这与我最初建议的非常相似，但是它具有访问 all 行而不是仅访问可见行的额外好处。

这是一个演示代码段：

var dataSet = [
  ["", "Tiger Nixon", "System Architect", "Edinburgh", "5421", "2011/04/25", "$320,800"],
  ["", "Garrett Winters", "Accountant", "Tokyo", "8422", "2011/07/25", "$170,750"],
  ["", "Ashton Cox", "Junior Technical Author", "San Francisco", "1562", "2009/01/12", "$86,000"],
  ["", "Cedric Kelly", "Senior Javascript Developer", "Edinburgh", "6224", "2012/03/29", "$433,060"],
  ["", "Airi Satou", "Accountant", "Tokyo", "5407", "2008/11/28", "$162,700"],
  ["", "Brielle Williamson", "Integration Specialist", "New York", "4804", "2012/12/02", "$372,000"],
  ["", "Herrod Chandler", "Sales Assistant", "San Francisco", "9608", "2012/08/06", "$137,500"],
  ["", "Rhona Davidson", "Integration Specialist", "Tokyo", "6200", "2010/10/14", "$327,900"],
  ["", "Colleen Hurst", "Javascript Developer", "San Francisco", "2360", "2009/09/15", "$205,500"],
  ["", "Sonya Frost", "Software Engineer", "Edinburgh", "1667", "2008/12/13", "$103,600"],
  ["", "Jena Gaines", "Office Manager", "London", "3814", "2008/12/19", "$90,560"],
  ["", "Quinn Flynn", "Support Lead", "Edinburgh", "9497", "2013/03/03", "$342,000"],
  ["", "Charde Marshall", "Regional Director", "San Francisco", "6741", "2008/10/16", "$470,600"],
  ["", "Haley Kennedy", "Senior Marketing Designer", "London", "3597", "2012/12/18", "$313,500"],
  ["", "Tatyana Fitzpatrick", "Regional Director", "London", "1965", "2010/03/17", "$385,750"],
  ["", "Michael Silva", "Marketing Designer", "London", "1581", "2012/11/27", "$198,500"],
  ["", "Paul Byrd", "Chief Financial Officer (CFO)", "New York", "3059", "2010/06/09", "$725,000"],
  ["", "Gloria Little", "Systems Administrator", "New York", "1721", "2009/04/10", "$237,500"],
  ["", "Bradley Greer", "Software Engineer", "London", "2558", "2012/10/13", "$132,000"],
  ["", "Dai Rios", "Personnel Lead", "Edinburgh", "2290", "2012/09/26", "$217,500"],
  ["", "Jenette Caldwell", "Development Lead", "New York", "1937", "2011/09/03", "$345,000"],
  ["", "Yuri Berry", "Chief Marketing Officer (CMO)", "New York", "6154", "2009/06/25", "$675,000"],
  ["", "Caesar Vance", "Pre-Sales Support", "New York", "8330", "2011/12/12", "$106,450"],
  ["", "Doris Wilder", "Sales Assistant", "Sidney", "3023", "2010/09/20", "$85,600"],
  ["", "Angelica Ramos", "Chief Executive Officer (CEO)", "London", "5797", "2009/10/09", "$1,200,000"],
  ["", "Gavin Joyce", "Developer", "Edinburgh", "8822", "2010/12/22", "$92,575"],
  ["", "Jennifer Chang", "Regional Director", "Singapore", "9239", "2010/11/14", "$357,650"],
  ["", "Brenden Wagner", "Software Engineer", "San Francisco", "1314", "2011/06/07", "$206,850"],
  ["", "Fiona Green", "Chief Operating Officer (COO)", "San Francisco", "2947", "2010/03/11", "$850,000"],
  ["", "Shou Itou", "Regional Marketing", "Tokyo", "8899", "2011/08/14", "$163,000"],
  ["", "Michelle House", "Integration Specialist", "Sidney", "2769", "2011/06/02", "$95,400"],
  ["", "Suki Burks", "Developer", "London", "6832", "2009/10/22", "$114,500"],
  ["", "Prescott Bartlett", "Technical Author", "London", "3606", "2011/05/07", "$145,000"],
  ["", "Gavin Cortez", "Team Leader", "San Francisco", "2860", "2008/10/26", "$235,500"],
  ["", "Martena Mccray", "Post-Sales support", "Edinburgh", "8240", "2011/03/09", "$324,050"],
  ["", "Unity Butler", "Marketing Designer", "San Francisco", "5384", "2009/12/09", "$85,675"]
];

$(document).ready(function() {
  var table = $('#example').DataTable({
    data: dataSet,
    columns: [
      {title: "Row ID"},
      {title: "Name"},
      {title: "Position"},
      {title: "Office"},
      {title: "Extn."},
      {title: "Start date"},
      {title: "Salary"}
    ]
  });
  $('button').on('click', function() {
    table.cells(':first-child').nodes().each(function(node, index) {
      table.cell(node).data(index + 1);
    });
    // redraw table and keep current pagination
    table.draw(false);
  });
});

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<script src="https://cdn.datatables.net/1.10.19/js/jquery.dataTables.min.js"></script>
<link href="https://cdn.datatables.net/1.10.19/css/jquery.dataTables.min.css" rel="stylesheet" />

<button>Click to reindex table</button><br><br>
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