Please open the browser's debug tool and switch to the network panel to see what data returned from your server.

22222222.png  from firefox firebug



The upload folder is full. Please try a smaller file and/or contact an administrator.

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at controller  : _parentId have value

at view : _parentId is null

$("#t_tg").treegrid("options").url = "/Test/TestGridData";
$('#t_tg').treegrid("load");

--------

but ↓ is ok

$.post("/Test/TestGridData", function (data) {
    $('#t_tg').treegrid('loadData', { total: data.length, rows: data });
});