googlesheet script question about mapping specific range - google-apps-script

Question

I have this onEdit function that goes over the sheet, looks at the cell value under NAME column, finds its position in another cell under LIST column and outputs this position in the POSITION column.
I am trying to find a way to limit this in a specific range, more specifically to exclude the 1st row (row 1) from this indexing, since if i add a row above the LIST, NAME and POSITION the function fails with TypeError: Cannot read property 'toString' of undefined.
Heres my function -
const ss = SpreadsheetApp.getActive();
const sh = ss.getSheetByName('sheet1');
const [hA, ...vs] = sh.getDataRange().getValues();
function onEdit() {
var r = ss.getActiveCell();
if( r.getColumn() > 7 ) {
let idx = {};
hA.forEach((h, i) => { idx[h] = i; });
let vO1 = vs.map((r, i) => {
var tes = [r[idx['LIST']].toString().split(',').indexOf( r[idx['NAME']] ) +1]
return (tes == 0) ? [''] : tes;
});
sh.getRange(2, idx['POSITION'] + 1, vO1.length, vO1[0].length).setValues(vO1);
}
}

Answer 1

Only 1 row before labels:
const [header, hA, ...vs] = sh.getDataRange().getValues();
Alternative:
const values = sh.getDataRange().getValues();
values.shift();
const [hA, ...vs] = values;
Mutiple rows (specify labelRow):
const labelRow = 2;
const values = sh.getDataRange().getValues();
const [hA, ...vs] = values.slice(labelRow - 1);
Alternative:
const labelRow = 2;
const rows = sh.getLastRow() - labelRow + 1;
const [hA, ...vs] = sh.getRange(label, 1, rows, sh.getLastColumn()).getValues();
There are bugs on your code.
return (tes == 0) ? [''] : tes; should be:
return (tes == [0]) ? [''] : tes;
sh.getRange(2, idx['POSITION'] + 1, vO1.length, vO1[0].length).setValues(vO1); should be (make sure to define labelRow):
sh.getRange(labelRow + 1, idx['POSITION'] + 1, vO1.length, vO1[0].length).setValues(vO1);