I think this is due to the dynamic nature of the child datatables in the parentChild example.
Apologizes if this has been answered previously, but I did not find anything in the search.

The line in the below code that is the issue (I think) is ' var rows = DataTables_Table_0.rows({ selected: true }).indexes();' which does not work. I attempted using the ID from inspect since there is no obvious instantiation of the datatable in question (at least that I can see).

Any ideas?

Thanks in advance!

{
    label: 'Users:',
    name: 'users.site',
    type: 'datatable',
    editor: usersEditor,
    submit: false,
    optionsPair: {
        value: 'users.id'
    },
    config: {
        ajax: {
            url: '../controllers/NEWuser/users.php',
            type: 'post',
            data: function (d) {
                if (siteTable) {
                    var selected = siteTable.row({ selected: true });
                    if (selected.any()) {
                        d.site = selected.data().id;
                    }
                }
            }
        },
        buttons: [
            { extend: 'create', editor: usersEditor },
            { extend: 'edit', editor: usersEditor },
           //{ extend: 'remove', editor: usersEditor }
 
 
            {
            extend: 'selected',
            text: 'Delete',
            action: function (e, dt, node, config) {
 
 
                var rows = DataTables_Table_0.rows({ selected: true }).indexes();
 
                usersEditor
                    .hide(usersEditor.fields())
                    .one('close', function () {
                        setTimeout(function () {
                            // Wait for animation
                            usersEditor.show(usersEditor.fields());
                        }, 500);
                    })
                    .edit(rows, {
                        title: 'Delete',
                        message:
                            rows.length === 1
                                ? 'Are you sure you wish to delete this row?'
                                : 'Are you sure you wish to delete these ' +
                                  rows.length +
                                  ' rows',
                        buttons: 'Delete'
                    })
                    .val(
                        'removed_date',
                        new Date().toISOString().split('T')[0]
                    );
            }
        }                  
 
        ],
        columns: [
            {
                data: 'users.first_name',
                title: 'First name'
            },
            {
                data: 'users.last_name',
                title: 'Last name'
            },
            {
                data: 'users.phone',
                title: 'Phone'
            }
        ]
    }
}