Hi,
I have correct your code. Please see below.
<!DOCTYPE html>
<html>
<head>
<body>
<form>Value One: <input type="text" name="valueOne" id="valueOne"> <br>
Value Two: <input type="text" name="valueTwo" id="valueTwo"> <br>
Value Three: <input type="text" name="valueThree" id="valueThree"> <br>
<div id="result"></div>
<input type="button" value="Submit" önclick="javascript:myCalc(document.getElementById('valueOne').value, document.getElementById
('valueTwo').value, document.getElementById('valueThree').value)">
</form>
<script>
function myCalc(valueOne, valueTwo, valueThree)
{
if (valueOne == 0) {
document.getElementById("result").innerHTML = 'Result: '+ (parseFloat(valueTwo) + parseFloat(valueThree));
} else if (valueTwo == 0) {
document.getElementById("result").innerHTML = 'Result: '+ (parseFloat(valueOne) + parseFloat(valueThree));
} else {
document.getElementById("result").innerHTML = 'Result: '+ (parseFloat(valueOne) + parseFloat(valueTwo));
}
}
</script>
</body>
</html>