Parsing long command-line arguments not working with getopt - bash

Question

I want to parse long command-line arguments for a large script as part of my current project. I have never tried getopt before but want to try the first time to make the script look tidy.
Before trying to push getopt on that large project script, I thought of checking it first on a sample script.
In the following example script, parsing short command-line arguments work fine but not the long command-line arguments:
#!/bin/bash
options=$(getopt -o d:f:t: -l domain -l from -l to -- "$#")
[ $? -eq 0 ] || {
echo "Incorrect options provided"
exit 1
}
eval set -- "$options"
while true; do
case "$1" in
-d|--domain)
DOMAIN=$2;
shift
;;
-f|--from)
FROM=$2;
shift
;;
-t|--to)
TO=$2;
shift
;;
--)
shift
break
;;
*)
echo "Invalid options!!";
exit 1
;;
esac
shift
done
echo "Domain is $DOMAIN"
echo "From address is $FROM"
echo "To address is $TO"
exit 0;
Output:
# ./getopt_check.bash -d hello.com -f from#test.com -t to#test.com
Domain is hello.com
From address is from#test.com
To address is to#test.com
# ./getopt_check.bash --domain hello.com -f from#test.com -t to#test.com
Invalid options!!
# ./getopt_check.bash --domain hello.com --from from#test.com --to to#test.com
Invalid options!!
I am expecting the same output as well when parsing long command arguments:
Domain is hello.com
From address is from#test.com
To address is to#test.com
When debugging:
# bash -x getopt_check.bash --domain hello.com -f from#test.com -t to#test.com
++ getopt -o d:f:t: -l domain -l from -l to -- --domain hello.com -f from#test.com -t to#test.com
+ options=' --domain -f '\''from#test.com'\'' -t '\''to#test.com'\'' -- '\''hello.com'\'''
+ '[' 0 -eq 0 ']'
+ eval set -- ' --domain -f '\''from#test.com'\'' -t '\''to#test.com'\'' -- '\''hello.com'\'''
++ set -- --domain -f from#test.com -t to#test.com -- hello.com
+ true
+ case "$1" in
+ DOMAIN=-f
+ shift
+ shift
+ true
+ case "$1" in
+ echo 'Invalid options!!'
Invalid options!!
+ exit 1
Here, the issue is passing case switch OR choice -d|--domain ?.

Answer 1

I guess its your getopt syntax. Use :
getopt -o d:f:t: -l domain:,from:,to: -- "$#"
Instead of :
getopt -o d:f:t: -l domain -l from -l to -- "$#"