When i run my script nothing happens - arrays

Question

So i recently found this google drive script and tried to use it.
The script should normally get file names and url on my google drive folder and copy them in a spreadsheet.
When i click Run, I get no error and nothing happens in my drive.
Is there variables i should change to make it work ?
PS : I'm very new to coding and can't seem to find what is wrong with this code
Thanks in advance for your help !
Here is the code :
function myFunction() {
function listFilesInFolder(foldername) {
// If we have not been provided a foldername, assume we will interact with user.
var interactive = (typeof foldername === 'undefined');
// Get name of folder to list
if (interactive) {
foldername = Browser.inputBox("List files in folder", "Enter folder name", Browser.Buttons.OK_CANCEL);
}
if (foldername === '') return; // No name provided, exit quietly
var folders = DriveApp.getFoldersByName(foldername);
if (!folders.hasNext()) {
if (interactive) Browser.msgBox("Folder not found.");
return;
}
var folder = folders.next();
var contents = folder.getFiles();
var file, data, sheet = SpreadsheetApp.getActiveSheet();
sheet.clear();
sheet.appendRow(["Name", "Date", "Size", "URL", /*"Download",*/ "Description", "Type"]);
// Loop over files in folder, using file iterator
while (contents.hasNext()) {
file = contents.next();
if (file.getMimeType() == MimeType.GOOGLE_SHEETS) { // "SPREADSHEET"
// Skip displaying spreadsheets - I don't know why...
continue;
}
data = [
file.getName(),
file.getDateCreated(),
file.getSize(),
file.getUrl(),
//"https://docs.google.com/uc?export=download&confirm=no_antivirus&id=" + file.getId(),
file.getDescription(),
niceFileType( file.getMimeType() )
];
sheet.appendRow(data);
}
}
}

Answer 1

Two issues. This needs to be ran in a script attached to a spreadsheet and you have a nested function.
Your code:
function myFunction() {
function listFilesInFolder(foldername) {
...
}
}
remove the outer function decleration and its matching closing bracket. The code will run.
It should look like:
function listFilesInFolder(foldername) {
...
}

Answer 2

Try this modified code in spreadsheet instead:
function myfunction(){
//Declaring the function listFolders to temp
var temp = function listFolders(foldername) {
// If we have not been provided a foldername, assume we will interact with user.
var interactive = (typeof foldername === 'undefined');
// Get name of folder to list
if (interactive) {
foldername = Browser.inputBox("List files in folder", "Enter folder name", Browser.Buttons.OK_CANCEL);
}
if (foldername === '') return; // No name provided, exit quietly
var folders = DriveApp.getFoldersByName(foldername);
if (!folders.hasNext()) {
if (interactive) Browser.msgBox("Folder not found.");
return;
}
var folder = folders.next();
var contents = folder.getFiles();
var file, data, sheet = SpreadsheetApp.getActiveSheet();
sheet.clear();
sheet.appendRow(["Name", "Date", "Size", "URL", /*"Download",*/ "Description", "Type"]);
// Loop over files in folder, using file iterator
while (contents.hasNext()) {
file = contents.next();
if (file.getMimeType() == MimeType.GOOGLE_SHEETS) { // "SPREADSHEET"
// Skip displaying spreadsheets - I don't know why...
continue;
}
data = [
file.getName(),
file.getDateCreated(),
file.getSize(),
file.getUrl(),
//"https://docs.google.com/uc?export=download&confirm=no_antivirus&id=" + file.getId(),
file.getDescription(),
file.getMimeType()
];
sheet.appendRow(data);
}
}
// calls the function listFolders below
temp()
}