I have created simple formula in google sheets which is going to be shared with many people. Sheet will be secured except few columns. I want to let those people edit cell's color in those columns. However, I don't want another person to change cell's color if it was already changed. Is there a way to block cell so it won't be allowing color changing? I found such a script:
function onEdit() {
// This script prevents cells from being updated. When a user edits a cell on the master sheet,
// it is checked against the same cell on a helper sheet. If the value on the helper sheet is
// empty, the new value is stored on both sheets.
// If the value on the helper sheet is not empty, it is copied to the cell on the master sheet,
// effectively undoing the change.
// The exception is that the first few rows and the first few columns can be left free to edit by
// changing the firstDataRow and firstDataColumn variables below to greater than 1.
// To create the helper sheet, go to the master sheet and click the arrow in the sheet's tab at
// the tab bar at the bottom of the browser window and choose Duplicate, then rename the new sheet
// to Helper.
// To change a value that was entered previously, empty the corresponding cell on the helper sheet,
// then edit the cell on the master sheet.
// You can hide the helper sheet by clicking the arrow in the sheet's tab at the tab bar at the
// bottom of the browser window and choosing Hide Sheet from the pop-up menu, and when necessary,
// unhide it by choosing View > Hidden sheets > Helper.
// See https://productforums.google.com/d/topic/docs/gnrD6_XtZT0/discussion
// modify these variables per your requirements
var masterSheetName = "master" // sheet where the cells are protected from updates
var helperSheetName = "Helper" // sheet where the values are copied for later checking
var firstDataRow = 1; // only take into account edits on or below this row
var firstDataColumn = 1; // only take into account edits on or to the right of this column
var ss = SpreadsheetApp.getActiveSpreadsheet();
var masterSheet = ss.getActiveSheet();
if (masterSheet.getName() != masterSheetName) return;
var masterCell = masterSheet.getActiveCell();
if (masterCell.getRow() < firstDataRow || masterCell.getColumn() < firstDataColumn) return;
var helperSheet = ss.getSheetByName(helperSheetName);
var helperCell = helperSheet.getRange(masterCell.getBackgroundColor());
var newValue = masterCell.getBackgroundColor();
var oldValue = helperCell.getBackgroundColor();
var green = "#00FF00"
var red = "#FF0000"
if (oldValue == green) {
masterCell.setBackgroundColor(green);
} else {
helperCell.setBackgroundColor(red);
}
}
But it doesn't work. Any idea?