ZilaStar ICT
Jul 12 2022, 11:41:03
Category : JavaScript Tutorials
Creating a Calculator with JS
<html>
<head>
<title>Math Fun</title>
<script>
function registerEvents(){
document.mathWiz.operate.addEventListener('click', doTheMath, false);
}
function doTheMath(){
var first = parseInt(document.mathWiz.numberOne.value);
var second = parseInt(document.mathWiz.numberTwo.value);
var operator = document.mathWiz.operator.value;
switch (operator){
case "add":
var answer = first + second;
break;
case "substract":
var answer = first - second;
break;
case "multiply":
var answer = first * second;
break;
case "divide":
var answer = first / second;
break;
}
document.mathWiz.theResult.value = answer;
}
</script>
</head>
<body onload = "registerEvents();">
<form name="mathWiz">
<label>First Number: <input type="number" name="numberOne"></label><br />
<label>Second Number: <input type="number" name="numberTwo"></label><br />
<label>Operator:
<select name = "operator">
<option value="add"> + </option>
<option value="substract"> - </option>
<option value="multiply"> * </option>
<option value="divide"> / </option>
</select>
</label><br />
<input type="button" name="operate" value="Do the Math!"><br />
<label>Result: <input type="number" name="theResult">
</form>
</body>
</html>
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