Listing folders in specified folder - netsuite

Question

I'm trying this code to list the files inside cabinet's folder in NetSuite, but I can list only the files. I need to list the folders inside the folder with the ID: 28
The code I'm using:
var folder = 28;
var filters = new Array();
filters[0] = new nlobjSearchFilter('internalid', null, 'is', folder);
var columns = new Array();
var filename = new nlobjSearchColumn('name', 'file');
var fileid = new nlobjSearchColumn('internalid', 'file');
columns[0] = filename;
columns[1] = fileid;
var searchResult = nlapiSearchRecord('folder', null , filters , columns);
if(searchResult) {
for (var i = 0 ; i < searchResult.length; i++) {
alert(searchResult[i].getValue(filename)+searchResult[i].getValue(fileid));
};
};
The result:
warning File1.txt1938 11/22/2016 17:30:08.693
warning File2.txt1636 11/22/2016 17:30:08.693
warning File3.txt1939 11/22/2016 17:30:08.693
warning File4.txt4601 11/22/2016 17:30:08.693
this is correct, but it's listing only files, not folders?
Thanks!

Answer 1

Perform a UserEvent BeforeLoad function. All files have a parent folder ID.
// pass in the internal id of the file's parent folder
var folder = 415 // the folder ID we care about
var filters = new Array();
filters[0] = new nlobjSearchFilter('internalid', null, 'is', folder);
//file name and file internal ID
var columns = new Array();
var filename = new nlobjSearchColumn('name', 'file');
var fileid = new nlobjSearchColumn('internalid', 'file');
columns[0] = filename;
columns[1] = fileid;
// perform the search and loop through the findings
var searchResult = nlapiSearchRecord('folder', null , filters , columns);
if(searchResult) {
for (var i = 0 ; i < searchResult.length; i++) {
var f = searchResult[i];
//do what you want with f here
};
};
Credit: http://blog.prolecto.com/2014/01/09/get-netsuite-list-of-files-from-folder/

Answer 2

I was able to list the subfolders of folder with this code:
var folder = 3232;
var filters = new Array();
filters[0] = new nlobjSearchFilter('parent', null, 'is', folder);
var columns = new Array();
var filename = new nlobjSearchColumn('name');
var fileid = new nlobjSearchColumn('internalid');
columns[0] = filename;
columns[1] = fileid;
var searchResult = nlapiSearchRecord('folder', null , filters , columns);
if(searchResult) {
for (var i = 0 ; i < searchResult.length; i++) {
alert(searchResult[i].getValue(filename)+searchResult[i].getValue(fileid));
};
};