Google Sheets run the script in all sheets - google-apps-script

Question

I am trying to implement the following function on Open sheet but I want to change the tab color on all the sheets. With this function, it allows me to change color only to single tab.
function getFirstEmptyRow() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheetname = "Section A";
var sheet = ss.getSheetByName(sheetname);
var column = sheet.getRange('F:F');
var values = column.getValues(); // get all data in one call
var ct = 0;
while ( values[ct][0] != "" ) {
ct++;
}
Logger.log("Row "+ ct);
var ax=sheet.getRange(ct, 7).getValue();
if(ax == ""){
sheet.setTabColor("ff0000")
} else {
sheet.setTabColor(null)
}
}

Answer 1

Try this:
function onOpen() {
var sheets = SpreadsheetApp.getActiveSpreadsheet().getSheets();
sheets.forEach(s => s.setTabColor("ff0000"));
}
It hard to tell from the provided code, probably you need this:
function onOpen() {
var sheets = SpreadsheetApp.getActiveSpreadsheet().getSheets();
for (var sheet of sheets) {
var data = sheet.getDataRange().getValues(); // get all data
var col_G = data.map(x => x[6]); // get column G
var last_cell = col_G.pop(); // get last cell of column F
if (last_cell == '') sheet.setTabColor("ff0000");
}
}
Or even shorter:
function onOpen() {
var sheets = SpreadsheetApp.getActiveSpreadsheet().getSheets();
for (var sheet of sheets) {
var data = sheet.getDataRange().getValues();
if (data.pop()[6] == '') sheet.setTabColor("ff0000");
}
}
It will make a tab red if in last row that of the table the cell in column G is empty.
If you have several sheets that you want to change you can filter them by names this way:
var names = ['Sheet1', 'Sheet2', 'Sheet3'];
var sheets = SpreadsheetApp.getActiveSpreadsheet().getSheets();
sheets = sheets.filter(s => names.includes(s.getName()));
// the rest of a code

Answer 2

I'm assuming you want to change the tab color for all sheets if the value in column F of the last row of any sheet is blank. There are other values in that row. I've include onOPen, onEdit and onChange.
function onOpen(e) {
// onOpen is a simple trigger and doesn't need to be installed
// don't really use e in this scenario
getFirstEmptyRow();
}
function onEdit(e) {
// onEdit is a simple trigger and doesn't need to be installed
var sheet = e.range.getSheet();
if( e.range.getRow() === sheet.getDataRange().getLastRow() ) {
if( e.range.getColumn() === 6 ) {
if( e.value === "" ) getFirstEmptyRow();
}
}
}
function onChange(e) {
// onChange is an installed trigger
// don't really use e in this scenario
getFirstEmptyRow();
}
function getFirstEmptyRow() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheets = ss.getSheets();
var i=0;
var sheet = null;
var value = null;
var color = null;
for( i=0; i<sheets.length; i++ ) {
sheet = sheets[i];
value = sheet.getRange(sheet.getDataRange().getLastRow(),7).getValue();
color = value === "" ? "ff0000" : null;
sheet.setTabColor(color);
}
}