Calculation in script and send result to a cell of active row - google-apps-script

Question

The "stock/average" sheet calculates the average purchase price. F is Products and H is the purchase price.
I need to calculate and save profit/loss of each sale in the E column after every sale. Like: the purchase price of the first product is 14200 (First image # stock/average, column H, second product) so 2800 should be put here. I can do it using vlookup or query but the purchase price gets changed with each purchase so I need to do it using the script and preserve the result.
Link to Spreadsheet:
Please help.

Answer 1

The code in this answer is presented in two parts:
Section One - Add this to your IF statement.
var thissheet = range.getSheet();
var edditedCol = range.columnStart;
var edittedRow = range.rowStart;
var productdetails = sheet.getRange(edittedRow,1,1,5).getValues();
var product = productdetails[0][0];
var qty = productdetails[0][1];
var sellprice = productdetails[0][2];
// Logger.log("DEBUG: product = "+product+", qty:"+qty+", sellprice="+sellprice);
var avg = getcost(product);
var net = +sellprice-(+avg*qty);
var netprofit = Math.round(net * 100) / 100
sheet.getRange(edittedRow,5).setValue(netprofit);
// Logger.log("DEBUG: net profit = "+netprofit);
This identifies the edited row and column, and get the values for the appropriate
- Product
- Qty
- Total sales value
- calls a separate function to return the average cost for the relevant product,
- calculates the net profit,
- updates the value in the "Profit" Column on the sheet.
Section Two - a sub-routine gets the average cost from the "stock/average" Sheet.
function getcost(product){
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheetname = "stock/average";
var sheet = ss.getSheetByName(sheetname);
var Fvals = sheet.getRange("F5:F").getValues();
var Flast = Fvals.filter(String).length;
var sarange = sheet.getRange(5,6,Flast,7);
// Logger.log("DEBUG: sarange = "+sarange.getA1Notation());
var data = sarange.getValues();
// convert the 2D array to a 1D array for the "Product" column.
var colA = new Array()
for(i=0;i<data.length;++i){
colA.push(data[i][0]) ;// taking index 0 means I'll get column A of each row and put it in the new array
}
// find the posityion of the editted product on the "stack/average" sheet
var pos = colA.indexOf(product);
// get the average cost for this line.
var avgcost = data[pos][2];
// Logger.log("DEBUG: the average cost = "+avgcost);
return avgcost;
}