How to create a basic calculator in javascript
Javascript Calculator
Code demo
Code demo
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Calculator in javascript</title>
<meta name="viewport" content="width=device-width,
initial-scale=1">
<style>
#tBox{font:700 18px arial;}
</style>
</head>
<body>
<div>
<input type="text" id="fBox" onclick="getSetValue('fBox')">
<input type="text" id="sBox" onclick="getSetValue('sBox')">
= <span id="tBox"></span>
<br>
<input type="button" id="1" value="1" onclick="setValue('1')">
<input type="button" id="2" value="2" onclick="setValue('2')">
<input type="button" id="3" value="3" onclick="setValue('3')">
<input type="button" id="4" value="4" onclick="setValue('4')">
<input type="button" id="5" value="5" onclick="setValue('5')">
<input type="button" id="6" value="6" onclick="setValue('6')">
<input type="button" id="7" value="7" onclick="setValue('7')">
<input type="button" id="8" value="8" onclick="setValue('8')">
<input type="button" id="9" value="9" onclick="setValue('9')">
<input type="button" id="0" value="0" onclick="setValue('0')">
<br>
<input type="button" value="Add" onclick="Add()">
<input type="button" value="Minus" onclick="Minus()">
<input type="button" value="Multiply" onclick="Multiply()">
<input type="button" value="Divide" onclick="Divid()">
<input type="reset" value="Reset" onclick="Reset()">
</div>
<script>
var setId = 'fBox';
function getSetValue(boxName){
setId = boxName;
}
function setValue(val){
var oldVale = document.getElementById(setId).value;
document.getElementById(setId).value = oldVale + val;
}
function Add(){
var firstValue = document.getElementById('fBox').value;
var secondValue = document.getElementById('sBox').value;
document.getElementById('tBox').innerHTML = Number(firstValue) + Number(secondValue);
}
function Minus(){
var firstValue = document.getElementById('fBox').value;
var secondValue = document.getElementById('sBox').value;
document.getElementById('tBox').innerHTML = Number(firstValue) - Number(secondValue);
}
function Multiply(){
var firstValue = document.getElementById('fBox').value;
var secondValue = document.getElementById('sBox').value;
document.getElementById('tBox').innerHTML = Number(firstValue) * Number(secondValue);
}
function Divid(){
var firstValue = document.getElementById('fBox').value;
var secondValue = document.getElementById('sBox').value;
document.getElementById('tBox').innerHTML = Number(firstValue) / Number(secondValue);
}
function Reset(){
document.getElementById('fBox').value = '';
document.getElementById('sBox').value = '';
document.getElementById('tBox').innerHTML = '';
}
</script>
</body>
</html>
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