Json to Tree conversion.

gistfile1.txt

var tree = [];

var transData = function (a, idStr, pidStr, childrenStr){
    var r = [], hash = {}, id = idStr, pid = pidStr, children = childrenStr, i = 0, j = 0, len = a.length;
    for(; i < len; i++){
        hash[a[i][id]] = a[i];
    }
    for(; j < len; j++){
        var aVal = a[j], hashVP = hash[aVal[pid]];
        if (hashVP) {
            !hashVP[children] && (hashVP[children] = []);
            hashVP[children].push(aVal);
        } else {
            r.push(aVal);
        }
    }
    return r;
}

tree = transData(res.data, 'id', 'parentid', 'children');