Conversion from Decimal to octal, binary and hexadecimal in javascript

Question

I have a form where a user enters a decimal number and then from the dropdown menu he chooses if he wants to convert it either to binary, octal or hexadecimal by clicking on a c

Answer 1

I see some error

it's not getElementbyId ==> is getElementById, bad use of the context(this) ... in your function Answer (this) is pointing to to the button .. I think you need to change the value on the input, right

try this:

function Answer(e) {
    e.preventDefault();
    var input = document.getElementById('input');
    if (document.getElementById('selectid').value ==="binary") {
        input.value = Number(input.value).toString(2);
    }
    else if  (document.getElementById('selectid').value ==="octal") {
        input.value = Number(input.value).toString(8);
    }
    else if  (document.getElementById('selectid').value ==="hexadecimal") {
        input.value = Number(input.value).toString(16);
    }
}   

Note: add id='input' to the input on the HTML part