If you set the 'layout:[]' property for the pagination, nothing displays on the page bar. If you only want to display page information on the bottom of the datagrid, please try to use the 'footer' instead.
$('#dg').datagrid({
footer: $('<div>0 rows</div>'),
onLoadSuccess: function(data){
var f = $(this).datagrid('getPanel').panel('footer');
f.html(data.rows.length+' rows');
}
})