the server'

    // fields definition
    var tableColumns = [
        '__checkbox:id',
        {
            name: 'id',
            title: '',
            dataClass: 'text-center',
            callback: 'showDetailRow'
        },
        {
            name: 'name',
            sortField: 'name',
        },
        {
            name: 'email',
            sortField: 'email',
        },
        {
            name: 'nickname',
            sortField: 'nickname',
            callback: 'al