Changing the string in an input form while the user typing

I want to change the text in an input form to "*" as the user is typing. I have figured out how to change the text to asterisks and it shows in the console as asterisks but I can't get to change the text while the user is typing. Here is my code:

const cardNumber = document.getElementById("input");
const reg = new RegExp("^[0-9]*$");
cardNumber.addEventListener("keyup", function changeChar(){
    if(cardNumber.value.length <= 12){
        for(i=0; i<cardNumber.value.length; i++){
            const newValue = cardNumber.value[i].replace(reg, "*");//Replaces the number with an asterisk
            console.log(newValue);//Outputs as asterisks on the console
            cardNumber.value[i].innerHTML = newValue;//This doesn't seem to do the trick
        }

    }
});

I tried changing the value of the text with .value and .innerHTML method but it didn't work out. I expect the text to change to asterisks as the user is typing.

Via Active questions tagged javascript - Stack Overflow https://ift.tt/UjF2Rak

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