Checkbox to approve entry on Google sheets and trigger an approval email - google-apps-script

Question

Currently im having a prompt window popup that collects the S. No of the entry and then approves that entry and sends out an approval email. Instead of this, i wanna have a check box that one checks to approve the entry and a function is triggered
function function1() {
var sheet= SpreadsheetApp.openById("xxxx").getSheetByName("payments");
var ui = SpreadsheetApp.getUi();
var result = ui.prompt('Please enter the S. No of the entry you want to approve', ui.ButtonSet.OK_CANCEL);
var button = result.getSelectedButton();
var sno = result.getResponseText();
for (var i=1; i<=100 ; i++)
{
Logger.log(sheet.getRange(i,1).getValue());
if(sno == sheet.getRange(i,1).getValue())
{
var index = i;
}
}
Logger.log(index);
var invitem = sheet.getRange(index,5).getValue();
var invdesc = sheet.getRange(index,6).getValue();
var reqby = sheet.getRange(index,3).getValue();
var amount = sheet.getRange(index,8).getValue();
if (button == ui.Button.OK)
{
var subject = 'Payment release request approved';
var body = '<p>Hello</p> <p>This particular payment release is approved from my end</p> <p>Invoice Item: '+ invitem +'</p> <p>Description: '+ invdesc +'</p> <p>Requested By: '+reqby+' </p> <p>Requested By: '+amount+' </p> <p> </p> <p><em>This is an automated email triggerred post approval</em></p>'
var email= 'finance#xxxx.xxx';
GmailApp.sendEmail(email, subject, "Requires HTML", {
htmlBody: body})
sheet.getRange(index,16).setValue("Approved").setBackground('#008000');
}
}

Answer 1

Okay here's a function and an installable trigger create function
function onMyEdit(e) {
const sh = e.range.getSheet();
if(sh.getName() == 'Your sheet name' && e.range.columnStart == '15' && e.value == "TRUE") {
let snum = sh.getRange(e.range.rowStart,1).getValue();
ApproveAndSendEmail({snum:snum});
}
}
function createTrigger() {
const ss = SpreadsheetApp.getActive();
if(ScriptApp.getProjectTriggers().filter(t => t.getHandlerFunction() == "onMyEdit").length == 0) {
ScriptApp.newTrigger('onMyEdit').forSpreadsheet(ss).onEdit().create();
}
}