How to Include more sheets to write incremental number - google-apps-script

Question

I am using this function which works upon submitting the entry via Google Forms. Currently the below script is adding increment number to the Sheet1 Last empty row
I want to include two more sheets where same incremental number will be added to last empty row.
Column will be same where increment number is pasting that is Column A but Sheet1 data starts from Row2 and Sheet2 and Sheet3 Data starts from row6.
Your help will be much appreciated.
function uPDATEiT() {
var aiColumnName = 'A'; //Sheet1,Sheet2,Sheet3 same column
var requieredColName = 'C' //it is just for Sheet1
var ss = SpreadsheetApp.getActiveSpreadsheet()
var worksheet = ss.getSheetByName('Sheet1','Sheet2','Sheet3')
var aiColRange = worksheet.getRange(aiColumnName + '1:' + aiColumnName + '1000');
var aiCol = aiColRange.getValues();
var aiColIndex = aiColRange.getColumn();
var reqCol = worksheet.getRange(requieredColName + '1:' + requieredColName + '1000').getValues();
var maxSeq = 0;
for (var i = 0; i <= aiCol.length; i++) {
if (parseInt(aiCol[i], 10) > maxSeq) { maxSeq = aiCol[i]; }
}
for (var i = 0; i <= aiCol.length; i++) {
if (('' + reqCol[i]).length > 0 && ('' + aiCol[i]).length === 0) {
maxSeq++;
worksheet.getRange(i + 1, aiColIndex).setValue(maxSeq);
}
}
}

Answer 1

You can use this formula in Sheet2!A4 and Sheet3!A4:
={"ID's";ARRAYFORMULA(IF(B5:B<>"",vlookup(B5:B,{'Data Sheet (Sheet1)'!$B$2:$B,'Data Sheet (Sheet1)'!$A$2:$A},2,false),""))}
What it does?
Check if column B is not empty, then get the id from Sheet1 based on the matched name(column B) as a key in the vlookup()
Output:
Original Sheet2:
Sheet 2 using the formula:
Update
If you just want to append your maxSeq in Sheet2, you can use this:
Code:
function uPDATEiT() {
var aiColumnName = 'A'; //Sheet1,Sheet2,Sheet3 same column
var requieredColName = 'C' //it is just for Sheet1
var ss = SpreadsheetApp.getActiveSpreadsheet()
var worksheet = ss.getSheetByName('Data Sheet (Sheet1)')
var sheet2 = ss.getSheetByName('Sheet2')
Logger.log(worksheet)
Logger.log(sheet2.getLastRow())
var aiColRange = worksheet.getRange(aiColumnName + '1:' + aiColumnName + '1000');
var aiCol = aiColRange.getValues();
var aiColIndex = aiColRange.getColumn();
var reqCol = worksheet.getRange(requieredColName + '1:' + requieredColName + '1000').getValues();
var maxSeq = 0;
for (var i = 0; i <= aiCol.length; i++) {
if (parseInt(aiCol[i], 10) > maxSeq) { maxSeq = aiCol[i]; }
}
for (var i = 0; i <= aiCol.length; i++) {
if (('' + reqCol[i]).length > 0 && ('' + aiCol[i]).length === 0) {
maxSeq++;
worksheet.getRange(i + 1, aiColIndex).setValue(maxSeq);
sheet2.getRange(sheet2.getLastRow()+1,aiColIndex).setValue(maxSeq);
}
}
}
Get the last row in the sheet that contains data using getLastRow() , then increment it by 1.
Output: