JAVASCRIPT

datatables modify rows

const table = $("#tableId").DataTable();

table.rows().every( function() {
	const node = this.node(); // html node -- tr
  	const row = $(node).find('td:eq(2)'); // 3rd (0-index) column -- td
}

edit data in datatable

Javascript
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var editor; // use a global for the submit and return data rendering in the examples
 
$(document).ready(function() {
    editor = new $.fn.dataTable.Editor( {
        ajax: "../php/staff.php",
        table: "#example",
        fields: [ {
                label: "First name:",
                name: "first_name"
            }, {
                label: "Last name:",
                name: "last_name"
            }, {
                label: "Position:",
                name: "position"
            }, {
                label: "Office:",
                name: "office"
            }, {
                label: "Extension:",
                name: "extn"
            }, {
                label: "Start date:",
                name: "start_date",
                type: "datetime"
            }, {
                label: "Salary:",
                name: "salary"
            }
        ]
    } );
 
    // Activate an inline edit on click of a table cell
    $('#example').on( 'click', 'tbody td:not(:first-child)', function (e) {
        editor.inline( this );
    } );
 
    $('#example').DataTable( {
        dom: "Bfrtip",
        ajax: "../php/staff.php",
        order: [[ 1, 'asc' ]],
        columns: [
            {
                data: null,
                defaultContent: '',
                className: 'select-checkbox',
                orderable: false
            },
            { data: "first_name" },
            { data: "last_name" },
            { data: "position" },
            { data: "office" },
            { data: "start_date" },
            { data: "salary", render: $.fn.dataTable.render.number( ',', '.', 0, '$' ) }
        ],
        select: {
            style:    'os',
            selector: 'td:first-child'
        },
        buttons: [
            { extend: "create", editor: editor },
            { extend: "edit",   editor: editor },
            { extend: "remove", editor: editor }
        ]
    } );
} );