Insert specific number of rows in a google sheet - google-apps-script

Question

I am trying to insert a specific number of cells into a Google sheet based on a number that is saved as a range. For example, the number in the range is 52, so on sheet 'Master' I want to insert 52 rows after row A3. This range is found on the sheet 'Staff' and changes according to how many staff were present each day, therefore, making it dynamic.
I am looking for some gscript to do this. I have been able to do this using a macro in Excel VBA but would like to move this from Excel to Google Sheets. The VBA code looks like this:
Sheets("Master").Select
Range("A3").EntireRow.Resize(Range("staff_count").Value).Insert CopyOrigin:=xlFormatFromRightOrBelow
Would be very grateful if anyone could help.
Thanks

Answer 1

You want to insert a given number of rows after row 3 on "Master". The number of rows is the value of a range on another sheet "Staff". This value will change from day to day.
In the following example, the range on Staff is cell "B1" and its value is 52.
There are several methods of doing this. In this example, I've used insertRowsAfter(afterPosition, howMany)doc. However, you could also use insertRows(rowIndex, numRows) doc.
function so5910073802() {
var ss = SpreadsheetApp.getActiveSpreadsheet()
var mastersheetname = "Master";
var master = ss.getSheetByName(mastersheetname);
var staffsheetname = "Staff";
var staff = ss.getSheetByName(staffsheetname);
// Staff range and value
var staffAttendRange = staff.getRange("B1");
var staffAttendValue = staffAttendRange.getValue(); // value = 52
// Logger.log("DEBUG: Staff attendance = "+staffAttendValue);
// Master variables
var headerRows = 3;
// insert the rows on Master based on value from Staff
master.insertRowsAfter(headerRows, staffAttendValue);
}
Before vs After
The value on row 4 and row 56 is =row()
BEFORE
AFTER