Hide columns in various sheets in Google Sheets on open - google-sheets

Question

I have a few scripts which, individually, all work. However I am unable to get them to all run on opening the sheet. At the moment, only the first script (hideColumn) runs on opening the sheet. The others all work when called directly from the menu I managed to create.
function onOpen() {
// get active spreadsheet
var ss = SpreadsheetApp.getActiveSpreadsheet();
// create menu
var menu = [{name: "Hide Overview Columns", functionName: "hideColumn"},
{name: "Hide Rebalancing Columns", functionName: "hideColumn2"},
{name: "Add/Hide Dividend Data for Chart", functionName: "hideColumn3"}];
// add to menu
ss.addMenu("Check", menu);
// execute function
function hideColumn(){
function hideColumn(){
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName("Overview");
// get data
var data = sheet.getDataRange();
// get number of columns
var lastCol = data.getLastColumn()+1;
Logger.log(lastCol);
// itterate through columns
for(var i=1; i<lastCol; i++) {
if(data.getCell(1, i).getValue() == 'HIDE') {
sheet.hideColumns(i);
}
}
}
function hideColumn2() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName("Rebalancing");
// get data
var data = sheet.getDataRange();
// get number of columns
var lastCol = data.getLastColumn()+1;
Logger.log(lastCol);
// itterate through columns
for(var i=1; i<lastCol; i++) {
if(data.getCell(2, i).getValue() == 'HIDE') {
sheet.hideColumns(i);
}
}
}
function showColumn3() {
// get active spreadsheet
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName("Dividends - Calculations");
// get data
var data = sheet.getDataRange();
// get number of columns
var lastCol = data.getLastColumn();
// show all columns
sheet.showColumns(1, lastCol);
}
function hideColumn3() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName("Dividends - Calculations");
// get data
var data = sheet.getDataRange();
// get number of columns
var lastCol = data.getLastColumn()+1;
Logger.log(lastCol);
// itterate through columns
for(var i=1; i<lastCol; i++) {
if(data.getCell(1, i).getValue() == 'HIDE') {
sheet.hideColumns(i);
}
}
}}}

Answer 1

we can help but won't code for you unless you showed us you tried!
Your best option is to have a look at the Google Apps Script documentation.
Here are the pages you need to check to do your script (you'll see it's well explained)
Create a menu
Hide a column
Get the content of a range
Create a loop to check several cell one by one in JS (Mozilla Doc)