Each month, populate spreadsheet data to next column [script needed] - excel

Question

I am developing a "Dashboard" [Sample Sheet Here] in which a number of data points are automatically calculated using formulas in Column C (NOTE: formulas not included in sample sheet).
I would like to create a monthly log of Column C data, in which cell values are copied to the next blank column of the corresponding Row
I have previously used the following script to log changes vertically, and could use a hand with repurposing for my desired outcome.
function onEdit(event) {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var s = event.source.getActiveSheet();
var r = event.source.getActiveRange();
if(s.getName() == "Action Items" && r.getColumn() == 2 && r.getValue()) {
var row = r.getRow();
var numColumns = s.getLastColumn();
var targetSheet = ss.getSheetByName("Portion Tracking");
if(targetSheet.getLastRow() == targetSheet.getMaxRows()) {
targetSheet.insertRowAfter(targetSheet.getLastRow());
}
//Changes Start Here
var myRow = targetSheet.getLastRow()+1;
s.getRange(row, 1).copyTo(targetSheet.getRange(myRow,1));
s.getRange(row, 2).copyTo(targetSheet.getRange(myRow,2));
s.getRange(row, 3).copyTo(targetSheet.getRange(myRow,3));
}
}

Answer 1

AppendColumn()
I played around with this idea once and using a function I took from here and some of my own carving. I've comeup with an appendColumn() function.
Anyway it sounded like something you might want to have. You can take a look at it and in the meantime I'll take a look at your code.
function appendColumn(columnA)
{
var ss=SpreadsheetApp.getActive();
var sh=ss.getActiveSheet();
var rg=sh.getDataRange();
var vA=rg.getValues();
var vB=transpose(vA);
sh.clear();
sh.getRange(1,1,vB.length,vB[0].length).setValues(vB);
sh.appendRow(columnA);
vD=sh.getDataRange().getValues();
sh.clear();
vE=transpose(vD);
sh.getRange(1,1,vE.length,vE[0].length).setValues(vE);;
}
function transpose(a)
{
return Object.keys(a[0]).map(function (c) { return a.map(function (r) { return r[c]; }); });
}
To test it I just called it like this.
function testAppendColumn()
{
appendColumn(['',1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]);
}
I'd like to see the source data. But assuming it has not changed then I'm guessing that this technique will work for you.
function onEdit(event)
{
var ss = event.source;
var s = event.source.getActiveSheet();
var r = event.range;
if(s.getName() == "Action Items" && r.getColumn() == 2 && r.getValue())
{
var row = r.getRow();
var numColumns = s.getLastColumn();
var targetSheet = ss.getSheetByName("Portion Tracking");
if(targetSheet.getLastRow() == targetSheet.getMaxRows())
{
targetSheet.insertRowAfter(targetSheet.getLastRow());
}
//Changes Start Here
var myCol = targetSheet.getLastColumn()+1;
s.getRange(row, 1).copyTo(targetSheet.getRange(1,myCol));
s.getRange(row, 2).copyTo(targetSheet.getRange(2,myCol));
s.getRange(row, 3).copyTo(targetSheet.getRange(3,myCol));
}
}
I don't understand the logic of connecting this to onEdit trigger but I'll assume that you do.