Autocomplete multiple dependent dropdowns lists - google-apps-script

Question

In this sheet, I have multiple dependent dropdown lists. These dropdown lists evaluate if they have multiple or only one option available. If I only have one option, it will autocomplete with the single possible value.
This is an example of the sheet: https://docs.google.com/spreadsheets/d/13fIO3OgAALDVx5PmX6mx0RMdES4PUdsSBU9aBOQhwuk/edit?usp=sharing
The problem is that when I chose a client that only has one project, this project is completed automatically but the task isn't.
This is an example of what I want when I will select Client 3 in column A
Code I use:
var mainWsName = "Page 1";
var optionsWsName = "Data";
var firstLevelColumn = 1;
var secondLevelColumn = 2;
var thirdLevelColumn = 5;
var ws = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(mainWsName);
var wsOptions = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Data");
var options = wsOptions.getRange(2,1,wsOptions.getLastRow()-1,7).getValues();
function onEdit(e){
var ws = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(mainWsName);
var row = e.range.getRow();
var col = e.range.getColumn();
var activeCell = e.range;
var val = activeCell.getValue();
var r = activeCell.getRow();
var c = activeCell.getColumn();
var wsName = activeCell.getSheet().getName()
if(wsName === mainWsName && c === firstLevelColumn && r > 3){
applyFirstLevelValidation(val,r)
}else if(wsName === mainWsName && c === secondLevelColumn && r > 3){
applySecondLevelValidation(val,r)
}
if(c === 1 && r > 3 && wsName === mainWsName && val === "intern"){
e.source.getActiveSheet().getRange(row,6).setValue("Not");
}else if(c === 1 && r > 3 && wsName === mainWsName && val !== ""){
e.source.getActiveSheet().getRange(row,6).setValue("Yes");
}else if(c === 1 && r > 3 && wsName === mainWsName && val === ""){
e.source.getActiveSheet().getRange(row,6).clearContent();
ws.getRange(r,secondLevelColumn).clearDataValidations();
}
}
function applyFirstLevelValidation(val,r){
if(val === ""){
ws.getRange(r,secondLevelColumn).clearContent();
ws.getRange(r,secondLevelColumn).clearDataValidations();
ws.getRange(r,thirdLevelColumn).clearContent();
ws.getRange(r,thirdLevelColumn).clearDataValidations();
} else{
ws.getRange(r,secondLevelColumn).clearContent();
ws.getRange(r,secondLevelColumn).clearDataValidations();
ws.getRange(r,thirdLevelColumn).clearContent();
ws.getRange(r,thirdLevelColumn).clearDataValidations();
var filteredOptions = options.filter(function(o){ return o[0] === val });
var listToApply = filteredOptions.map(function(o){ return o[1] });
var cell = ws.getRange(r,secondLevelColumn);
applyValidationToCell(listToApply,cell);
var rule = SpreadsheetApp.newDataValidation().requireValueInList(listToApply).build();//creo el dropdown
if(listToApply[1] || null){
applyValidationToCell(listToApply,cell);
}else{
cell.setDataValidation(rule).setValue(listToApply[0] || null);
}
}
}
function applySecondLevelValidation(val,r){
if(val === ""){
ws.getRange(r,thirdLevelColumn).clearContent();
ws.getRange(r,thirdLevelColumn).clearDataValidations();
} else{
ws.getRange(r,thirdLevelColumn).clearContent();
var firstLevelColValue = ws.getRange(r,firstLevelColumn).getValue();
var filteredOptions = options.filter(function(o){ return o[0] === firstLevelColValue && o[1] === val });
var listToApply = filteredOptions.map(function(o){ return o[2] });
var cell = ws.getRange(r,thirdLevelColumn);
applyValidationToCell(listToApply,cell);
var rule = SpreadsheetApp.newDataValidation().requireValueInList(listToApply).build();
cell.setDataValidation(rule).setValue(listToApply[0] || null);
}
}
function applyValidationToCell(list,cell) {
var rule = SpreadsheetApp.newDataValidation().requireValueInList(list).build();
cell.setDataValidation(rule);
}

Answer 1

Although I'm not sure whether I could correctly understand your question, for example, is the following modification the result you expect? In this modification, please modify the function of applyFirstLevelValidation as follows.
From:
if(listToApply[1] || null){
applyValidationToCell(listToApply,cell);
}else{
cell.setDataValidation(rule).setValue(listToApply[0] || null);
}
To:
if (listToApply[1] || null) {
applyValidationToCell(listToApply, cell);
} else {
cell.setDataValidation(rule).setValue(listToApply[0] || null);
applySecondLevelValidation(listToApply[0], r); // <--- Added
}