How to restrict edit script to run in specific column _google sheets - google-apps-script

Question

I am running a script in sheets to allow multiple selection. The script works but when i go to edit a cell somewhere else on the sheet the information disappears. I need to run this script only for column 5, so if something is documented elsewhere, it wont keep disappearing.
function onEdit(e) {
var oldValue;
var newValue;
var ss=SpreadsheetApp.getActiveSpreadsheet();
var activeCell = ss.getActiveCell();
if(activeCell.getColumn() == 5 && ss.getActiveSheet().getName()=="TRACKER- Relaunch")
newValue=e.value;
oldValue=e.oldValue;
if(!e.value) {
activeCell.setValue("");
}
else {
if (!e.oldValue) {
activeCell.setValue(newValue);
}
else {
if(oldValue.indexOf(newValue) <0) {
activeCell.setValue(oldValue+','+newValue);
}
else {
activeCell.setValue(oldValue);
}
}
}
}

Answer 1

Wrap your function in an if statement which checks that the changed cell is in the 5th columns and that you are in the correct sheet.
function onEdit( event ){
const columnOfCell = event.columnStart;
const currentSheetName = SpreadsheetApp.getActiveSheet().getName();
const targetSheetName = "TRACKER- Relaunch";
if( columnOfCell === 5 && currentSheetName === targetSheetName){
// work your magic here
}
}

Answer 2

Try this:
function onEdit(e) {
var sh=e.range.getSheet();
if(e.range.columnStart==5 && sh.getName()=="TRACKER- Relaunch") {
if(!e.value) {//this doesn't make much sense
e.range.setValue("");
}else if(!e.oldValue) {//nor does this
e.range.setValue(e.value);
}else if(e.oldValue.indexOf(e.value)==-1) {
e.range.setValue(e.oldValue + ',' + e.value);
}else{
e.range.setValue(e.oldValue);
}
}
}