Remove date stamp when previous cell is cleared? - google-apps-script

Question

I have a script I currently use to add a date stamp when the low inventory is changed on an item. I want it to remove the date stamp when the inventory cell is cleared (if the item went out of stock).
Currently, even when I delete the date stamp and inventory, it automatically puts the date stamp back in.
Basically, I only want a date stamp if there is information in the previous cell & want the date to update every time I change the info in the previous cell.
I am very new to scripts. Is that possible? Here is the script I am using that I found online:
function onEdit() {
var s = SpreadsheetApp.getActiveSheet();
if( s.getName() == "Data" ) { //checks that we're on the correct sheet
var r = s.getActiveCell();
if( r.getColumn() == 4 ) { //checks the column
var nextCell = r.offset(0, 1);
nextCell.setValue(new Date());
}
}
}

Answer 1

You want to take some action based on whether the current cell contains information or not. You can get the current value in the cell with .getActiveCell().getValue() and use that with if else to conditionally take some actions. In the example below, we set a timestamp if the value is truthy and clear the timestamp cell if the value is falsy.
function onEdit() {
var s = SpreadsheetApp.getActiveSheet();
if (s.getName() !== "Data") return; // exit if not in "Data"
var r = s.getActiveCell();
if (r.getColumn() !== 4 ) return; // exit if not editing col D
var nextCell = r.offset(0, 1);
// make a stamp or remove the stamp based on current cell value
if (r.getValue())
nextCell.setValue(new Date())
else nextCell.clear();
}

Answer 2

Try this:
function onEdit(e) {
const sh=e.range.getSheet();
if(sh.getName()=="Data" && e.range.columnStart==4) {
const ts=Utilities.formatDate(new Date(),Session.getScriptTimeZone(),"E MMM dd, yyyy HH:mm:ss");
if(e.value) {
e.range.offset(0,1).setValue(ts);//if D is not blank
}else{
e.range.offset(0,1).setValue('');//if D is blank
}
}
}
Format Date