GoogleSheet script editor - onEdit event with conditions / if statement - if-statement

Question

guys!
I'm new to this website and also not good with coding. So I would really appreciate some help.
Right now I'm in need of a specific code to make a google sheet work perfectly.
To further explain:
I have a google sheet that a few information will be input by other co-workers. What I need is a code that will register the date in a specific cell and by whom the input was made on another cell.
So far this is what I have:
function onEdit(event) {
var sheet = event.source.getSheetByName("Input");
// Note: actRng = return the last cell of the row modified
var actRng = event.source.getActiveRange();
var index = actRng.getRowIndex();
var cindex = actRng.getColumnIndex();
// Note: date = return date
// Note: user = return the user email
var userCell = sheet.getRange(index,14);
var dateCell = sheet.getRange(index,2);
var inputdate = Utilities.formatDate(new Date(), "GMT+0200", "yyyy-MM-dd");
// Note(with hour): var inputdate = Utilities.formatDate(new Date(), "GMT+0200", "yy-MM-dd HH:mm");
//var user = event.user; // Note: event.user will not give you collaborator's Id
var user = Session.getEffectiveUser();
// Note: setValue = Insert in the cell the date when this row was modified
if (userCell.Value == null) {
userCell.setValue(user);
dateCell.setValue(inputdate)
}
}
My main problems/questions are:
I don't exactly need the last modifier, but the person who first input info on the cells. Therefore I tried that last IF (If the cell that is supposed to have the last modifier e-mail is blank, it means that nobody changed that row before, so the code should add the user on the userCell), although it is not working since every change I make it ignores the verification.
I also want to add that the event will only happen if you add values, if you delete them, nothing happens. (so far even when I delete cells, it counts as modification)
Most of the sheet is protected to avoid that people by accident erase some of the formulas, so the cells that this code changes are also protected. Is there a way to make the code bypass cell protection?
Please, help me identify what I'm doing wrong and hopefully I'll get this working perfectly! Thanks for the help !

Answer 1

If you want to prevent the script from firing when a cell is deleted, try:
var editedCell = SpreadsheetApp.getActiveSheet().getRange(e.range.getRow(), e.range.getColumn());
if (editedCell == "") {
return;
}
I would change Session.getEffectiveUser() to session.getActiveUser().
The last if statement is unnecessary. You want whoever most recently edited the field to be identified, along with the date.