Google Apps Script Convert Positive into Negative Value When Pasting In Cell - google-apps-script

Question

How do I make a positive value be converted automatically into negative without adding formula to a cell when someone pastes/or added a value to a cell.
In this example I want that 5 2 and 3 be a negative value.

Answer 1

In your situation, how about using the simple trigger of onEdit as follows?
Sample script:
Please copy and paste the following script to the script editor of Spreadsheet and save the script. When you use this script, please put a positive value to a cell. By this, the positive value is converted to the negative value.
function onEdit(e) {
const value = e.range.getValue();
if (!isNaN(value) && value > 0) {
e.range.setValue(-value);
}
}
Note:
If you want to limit the sheet and the range, please tell me.
If you want to convert all cell values in a sheet by a script, how about the following script? When this script is run, the positive values in a sheet are converted to negative values.
function myFunction() {
const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Sheet1"); // Please set your sheet name.
const range = sheet.getDataRange();
const values = range.getValues().map(r => r.map(c => !isNaN(c) && c > 0 ? -c : c));
range.setValues(values);
}
Reference:
Simple Triggers
Added 1:
From your following additional request,
Is it possible to apply it with certain range only. Like to cell C45:AK76 and C84:AK115?
In this case, how about the following sample script?
Sample script:
function onEdit(e) {
const ranges = ["C45:AK76", "C84:AK115"]; // These ranges are from your reply.
const sheetName = "Sheet1"; // Please set your sheet name.
const { range } = e;
const sheet = range.getSheet();
const value = range.getValue();
const check = sheet.getRangeList(ranges).getRanges().some(r => {
const startRow = r.getRow();
const endRow = startRow + r.getNumRows() - 1;
const startCol = r.getColumn();
const endCol = startCol + r.getNumColumns() - 1;
return range.rowStart >= startRow && range.rowEnd <= endRow && range.columnStart >= startCol && range.columnEnd <= endCol;
});
if (sheet.getSheetName() != sheetName || !check || isNaN(value) || value < 0) return;
range.setValue(-value);
}
In this sample, the script is run when the cells "C45:AK76", "C84:AK115" are edited.
Added 2:
From your following additional request,
Im wondering if I can apply this to two other sheets with the same cell range?
In this case, how about the following sample script?
Sample script:
function onEdit(e) {
const ranges = ["C45:AK76", "C84:AK115"]; // These ranges are from your reply.
const sheetNames = ["Sheet1", "Sheet2",,,]; // Please set your sheet names.
const { range } = e;
const sheet = range.getSheet();
const value = range.getValue();
const check = sheet.getRangeList(ranges).getRanges().some(r => {
const startRow = r.getRow();
const endRow = startRow + r.getNumRows() - 1;
const startCol = r.getColumn();
const endCol = startCol + r.getNumColumns() - 1;
return range.rowStart >= startRow && range.rowEnd <= endRow && range.columnStart >= startCol && range.columnEnd <= endCol;
});
if (!sheetNames.includes(sheet.getSheetName()) || !check || isNaN(value) || value < 0) return;
range.setValue(-value);
}
Added 3:
From your following additional request,
If I paste for example these 3 different values into the cell., example the number 4 5 and 6. Instead of just having -4,-5, and -6. The result I'm getting is -4,-4 and -4.
In this case, how about the following sample script?
Sample script:
function onEdit(e) {
const ranges = ["C45:AK76", "C84:AK115"]; // These ranges are from your reply.
const sheetNames = ["Sheet1", "Sheet2",,,]; // Please set your sheet names.
const { range } = e;
const sheet = range.getSheet();
const values = range.getValues();
const check = sheet.getRangeList(ranges).getRanges().some(r => {
const startRow = r.getRow();
const endRow = startRow + r.getNumRows() - 1;
const startCol = r.getColumn();
const endCol = startCol + r.getNumColumns() - 1;
return range.rowStart >= startRow && range.rowEnd <= endRow && range.columnStart >= startCol && range.columnEnd <= endCol;
});
if (!sheetNames.includes(sheet.getSheetName()) || !check) return;
range.setValues(values.map(r => r.map(c => (!isNaN(c) && c > 0) ? -c : c)));
}