DROPDOWN LIST VALIDATION: HELP PLEASE!

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Mar 28, 2022 Mar 28, 2022

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I HAVE 4 OF THE SAME DROPDOWNS AND I NEED THE PERSON TO CHOOSE 1 OPTION FROM EACH. THE NUMBER HE CHOOSES CANNOT BE REPEATED IN THE OTHERS. THAT IS TO SAY, THE OPTIONS ARE THE NUMBERS FROM 1 TO 4. IF IN THE FIRST ONE HE CHOOSES 1, IN THE OTHERS HE CAN ONLY CHOOSE THE NUMBERS 2, 3 AND 4. AT THE END EACH ONE OF THE 4 NUMBERS MUST BE IN A DROPDOWN. HOW SHOULD THE JAVA SCRIPT LOOK LIKE?

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