Send automated email based on cell value changes in a range - email

Question

I'm working on a scoreboard automation process using Google Sheets, but I've come up with a little problem.
I want an automatic e-mail to be sent to a list of emails when a cell value in a range is met.
For example, when an user takes a test, if his/her scores is below 50%, it will instantly send an email to the teacher and the students.
The contents of the email should be able to edit easily based on different scores. For example, if the score is below 30% > send an warning email, if the score is above 60%, send a congratulations email
Other needs:
The script should be able to send notification instantly right after the user complete the test
The script should work when other users use the file, not just the owner of the file
I've used similar Appscripts, however if I use onEdit or onChange trigger, everytime any cell change, it send an email, which is way to many, I only want the email to be sent when the test taker complete a whole test.
The Link of a demo file is below, please take a look. Many thanks https://docs.google.com/spreadsheets/d/1s0IApxtJuUNbHhKRxEpFnJg_rd2_JAk-GjnSUP9VdJs/edit#gid=0
I don't know how to code so I cannot include a script here, I just think that it might be possible to use Google Appscript or some extensions.

Answer 1

Try (set a trigger on the onSpeEdit function when the edit happens)
function onSpeEdit(event) {
var sh = event.source.getActiveSheet();
var rng = event.source.getActiveRange();
if (rng.getColumn() >= 3 && rng.getColumn() <= 11) {
if (sh.getRange(rng.getRow(), 12).getValue() == 'Completed') {
var d = Utilities.formatDate(new Date(), Session.getScriptTimeZone(), "MMM dd yyyy hh:mm a");
if (sh.getRange(rng.getRow(), 13).getValue() > 0.5) {
MailApp.sendEmail({
to: sh.getRange(rng.getRow(), 2).getValue(),
cc: sh.getRange('B2').getValue(),
subject: "Congratulations",
body: sh.getRange(rng.getRow(), 14).getValue(),
});
sh.getRange(rng.getRow(), 15).setValue('sent # ' + d)
}
else if (sh.getRange(rng.getRow(), 13).getValue() < 0.3) {
MailApp.sendEmail({
to: sh.getRange(rng.getRow(), 2).getValue(),
cc: sh.getRange('B2').getValue(),
subject: "Warning",
body: sh.getRange(rng.getRow(), 14).getValue(),
});
sh.getRange(rng.getRow(), 15).setValue('sent # ' + d)
}
}
}
}