AddEventListener: Disable select option based on value inserted

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Hi,

I’d like to disable an option on a select (x[2]) based on value inserted on a number input field (x[1]).

if (x[1] >= 45) {
	for (let opt of x[2].options) {
		(opt.value == 3500).addAttr('disabled', 'disabled');
	}
}

x[1] is a Number input field
x[2] is a Select input

Above function doesn’t seem to work

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