JS Calculator

Developer
Hantz Pierre
Size
4,859 Kb
Views
28,336
  1. JS Calculator Previews
  2. JS Calculator HTML Codes
  3. JS Calculator CSS Codes
  4. JS Calculator JS Codes

How do I make an js calculator?

What is a js calculator? How do you make a js calculator? This script and codes were developed by Hantz Pierre on 07 September 2022, Wednesday.

JS Calculator Previews
IQ Test

JS Calculator - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>JS Calculator</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <div id="calculator">	<div class="top">	<span class="clear">C</span>	<div class="screen"></div>	</div>	<div class="keys">	<span>7</span>	<span>8</span>	<span>9</span>	<span class="operator">+</span>	<span>4</span>	<span>5</span>	<span>6</span>	<span class="operator">-</span>	<span>1</span>	<span>2</span>	<span>3</span>	<span class="operator">÷</span>	<span>0</span>	<span>.</span>	<span class="eval">=</span>	<span class="operator">x</span>	</div>
</div> <script src='https://code.jquery.com/jquery-2.2.4.min.js'></script> <script src="js/index.js"></script>
</body>
</html>

JS Calculator - Script Codes CSS Codes

* {	margin: 0;	padding: 0;	box-sizing: border-box;	font: normal 25px Arial, sans-serif; -webkit-touch-callout: none; -webkit-user-select: none; user-select: none;
}
html {	height: 100%;	background: url(https://33.media.tumblr.com/d4a884274dff05760e01bd3bdcc6defb/tumblr_nb1ulnMaP91st5lhmo1_1280.jpg);	background-size: cover;
}
#calculator {	width: 325px;	height: auto;	overflow:hidden;	margin: 100px auto;	padding: 20px 20px 9px;	position:relative;	background: rgba(0,0,0,0.3);	border-radius: 3px;	box-shadow: 0px 10px 15px rgba(0, 0, 0, 0.2);
}
.top span.clear {	position:absolute; z-index:6;
}
.top .screen {	height: 80px;	width: 100%;	position:absolute; top:0; left:0;	padding: 20px 10px;	background: rgba(0, 0, 0, 0.2);	font-size: 27px; font-weight:normal;	line-height: 40px;	color: white;	text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);	text-align: right;	letter-spacing: 1px;
}
.keys, .top {overflow: hidden;}
.keys span, .top span.clear {	float: left;	position: relative;	top: 0;	cursor: pointer;	width: 66px;	height: 56px;	background: rgba(0,0,0,0.5);	border-radius: 3px;	box-shadow: 0px 4px rgba(0, 0, 0, 0.2);	margin: 0 7px 11px 0;	color: #ccc;	line-height: 56px;	text-align: center;	user-select: none;	transition: all 0.2s ease;
}
.keys span.operator {	background: rgba(250,100,0,0.3);	margin-right: 0;
}
.keys span.eval {	color: #888e5f;
}
.top span.clear {	background: transparent;	box-shadow: none;	color: #aaa; width:56px; left:5px
}
.keys span:hover {	background: rgba(255,255,255,0.8);	color: #333;
}
.keys span.eval:hover {	background: #abb850;	color: #ffffff;
}
.top span.clear:hover { border-radius:190px;	background: rgba(0,0,0,0.1);	color: white;
}
.keys span:active {	box-shadow: 0px 0px rgba(0, 0, 0, 0.2);	top: 4px;
}
.keys span.eval:active {	box-shadow: 0px 0px #717a33;	top: 4px;
}
.top span.clear:active {	top: 4px;	box-shadow: 0px 0px #d3545d;
}

JS Calculator - Script Codes JS Codes

'use strict';
// Get all the keys from document
var keys = document.querySelectorAll('#calculator span');
var operators = ['+', '-', 'x', '÷'];
var decimalAdded = false;
// Add onclick event to all the keys and perform operations
for (var i = 0; i < keys.length; i++) {	keys[i].onclick = function (e) {	// Get the input and button values	var input = document.querySelector('.screen');	var inputVal = input.innerHTML;	var btnVal = this.innerHTML;	// Now, just append the key values (btnValue) to the input string and finally use javascript's eval function to get the result	// If clear key is pressed, erase everything	if (btnVal == 'C') {	input.innerHTML = '';	decimalAdded = false;	}	// If eval key is pressed, calculate and display the result	else if (btnVal == '=') {	var equation = inputVal;	var lastChar = equation[equation.length - 1];	// Replace all instances of x and ÷ with * and / respectively. This can be done easily using regex and the 'g' tag which will replace all instances of the matched character/substring	equation = equation.replace(/x/g, '*').replace(/÷/g, '/');	// Final thing left to do is checking the last character of the equation. If it's an operator or a decimal, remove it	if (operators.indexOf(lastChar) > -1 || lastChar == '.') equation = equation.replace(/.$/, '');	if (equation) input.innerHTML = eval(equation);	decimalAdded = false;	}	// Basic functionality of the calculator is complete. But there are some problems like	// 1. No two operators should be added consecutively.	// indexOf works only in IE9+	else if (operators.indexOf(btnVal) > -1) {	// Operator is clicked	// Get the last character from the equation	var lastChar = inputVal[inputVal.length - 1];	// Only add operator if input is not empty and there is no operator at the last	if (inputVal != '' && operators.indexOf(lastChar) == -1) input.innerHTML += btnVal;	// Allow minus if the string is empty	else if (inputVal == '' && btnVal == '-') input.innerHTML += btnVal;	// Replace the last operator (if exists) with the newly pressed operator	if (operators.indexOf(lastChar) > -1 && inputVal.length > 1) {	// Here, '.' matches any character while $ denotes the end of string, so anything (will be an operator in this case) at the end of string will get replaced by new operator	input.innerHTML = inputVal.replace(/.$/, btnVal);	}	decimalAdded = false;	}	// Now only the decimal problem is left. We can solve it easily using a flag 'decimalAdded' which we'll set once the decimal is added and prevent more decimals to be added once it's set. It will be reset when an operator, eval or clear key is pressed.	else if (btnVal == '.') {	if (!decimalAdded) {	input.innerHTML += btnVal;	decimalAdded = true;	}	}	// if any other key is pressed, just append it	else {	input.innerHTML += btnVal;	}	};
}
JS Calculator - Script Codes
JS Calculator - Script Codes
Home Page Home
Developer Hantz Pierre
Username universe360
Uploaded September 07, 2022
Rating 3
Size 4,859 Kb
Views 28,336
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