Delete cell if cell C7 is empty - google-apps-script

Question

I'm working with Google Apps Script and I am trying to write a simple code (I believe it is going to be simple....)
So what I am trying to achieve is the following:
If cell C7 is empty, I want cell A20:A to clear.
I have tried
.isBlank()
"C7" === ""
but none of them seems to work. Can anyone help me solve it? I learned python but apparently Java seems to not function the same way.
Maybe a little help please?
My trial code is this. I think nothing is wrong but why won't it work?
function myFunction() {
var sheet = SpreadsheetApp.getActive().getSheetByName("sheet1");
if(sheet.getRange(7, 3).getValue() == ''){
sheet.getRange("A20:A").removeCheckboxes();
}
}
Okay. I decided to share the entire onEdit(e) function I have right now.
function onEdit(e) {
first();
second();
function first() {
const sheet = SpreadsheetApp.getActiveSheet();
const sName = sheet.getName();
if (sName === "sheet1") {
const len = sheet.getRange('B20:B').getValues().filter(row => row[0] != '').length;
if (e.range.getColumn() === 3 && e.range.getRow() === 7) {
const range = sheet.getRange(20,1,len,1);
sheet.getRange('A20:A').removeCheckboxes();
range.insertCheckboxes().uncheck();
}
if (e.range.getRow() > 19 && e.range.getColumn() === 1 && e.range.getValues()[0][0] === true) {
sheet.getRange('A20:A').uncheck();
e.range.check();
}
}
}
function second() {
var sheet = SpreadsheetApp.getActive().getSheetByName("sheet1");
var range = e.source.getActiveRange();
if(e.range.getRow() == 7 && range.getColumn() == 3) {
if(sheet.getRange("C7").getValue() == "") {
Logger.log("C7 is empty");
sheet.getRange('A20:A').clearContent();
}
}
}
}
A very dear person from stackoverflow has helped me right the first half of the function. Thank you and shout out to dear friend!!
Second part of the function I very much referenced dear Mateusz. Thank you so much for the help.
However, I still have a problem of not being able to clear the cell whenever cell C7 is empty. Can anyone spot the problem???

Answer 1

You can do it like this:
function myFunction() {
var sheet = SpreadsheetApp.getActive().getSheetByName("sheet1");
if(sheet.getRange(7, 3).getValue() == '')
{
Logger.log("C7 is empty");
sheet.getRange(20,1,sheet.getLastRow(),1).clearContent();
}else{
Logger.log("C7 is not empty");
}
}
code for checking every time C7 cell is edited:
function onEdit(e) {
var sheet = SpreadsheetApp.getActive().getSheetByName("sheet1");
var range = e.source.getActiveRange();
if(e.range.getRow() == 7 && range.getColumn() == 3)
{
if(sheet.getRange(7, 3).getValue() == '')
{
Logger.log("C7 is empty");
sheet.getRange(20,1,sheet.getLastRow(),1).clearContent();
}else{
Logger.log("C7 is not empty");
}
}
}
code to check ecery time a cell is edited:
function onEdit(e) {
var sheet = SpreadsheetApp.getActive().getSheetByName("sheet1");
if(sheet.getRange(7, 3).getValue() == '')
{
Logger.log("C7 is empty");
sheet.getRange(20,1,sheet.getLastRow(),1).clearContent();
}else{
Logger.log("C7 is not empty");
}
}