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calculator.html
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calculator.html
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<html>
<head>
<link rel="stylesheet" type="text/css" href="style.css" />
<link
href="https://fonts.googleapis.com/css?family=Open+Sans:600,700"
rel="stylesheet"
/>
<title>A simple calculator</title>
<style>
body {
font-family: "Open Sans", sans-serif;
background-color: black;
}
#container {
width: 1000px;
height: 550px;
background-image: linear-gradient(
rgba(0, 0, 0, 0.3),
rgba(0, 0, 0, 0.3)
),
url(bgImg.jpg);
margin: 20px auto;
}
#calculator {
width: 320px;
height: 520px;
background-color: #eaedef;
margin: 0 auto;
top: 20px;
position: relative;
border-radius: 5px;
box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2),
0 6px 20px 0 rgba(0, 0, 0, 0.19);
}
#result {
height: 120px;
}
#history {
text-align: right;
height: 20px;
margin: 0 20px;
padding-top: 20px;
font-size: 15px;
color: #919191;
}
#output {
text-align: right;
height: 60px;
margin: 10px 20px;
font-size: 30px;
}
#keyboard {
height: 400px;
}
.operator,
.number,
.empty {
width: 50px;
height: 50px;
margin: 15px;
float: left;
border-radius: 50%;
border-width: 0;
font-weight: bold;
font-size: 15px;
}
.number,
.empty {
background-color: #eaedef;
}
.number,
.operator {
cursor: pointer;
}
.operator:active,
.number:active {
font-size: 13px;
}
.operator:focus,
.number:focus,
.empty:focus {
outline: 0;
}
button:nth-child(4) {
font-size: 20px;
background-color: #20b2aa;
}
button:nth-child(8) {
font-size: 20px;
background-color: #ffa500;
}
button:nth-child(12) {
font-size: 20px;
background-color: #f08080;
}
button:nth-child(16) {
font-size: 20px;
background-color: #7d93e0;
}
button:nth-child(20) {
font-size: 20px;
background-color: #9477af;
}
.back {
position: absolute;
right: 5%;
bottom: 5%;
}
.btn-back {
width: 60px;
height: 45px;
background-color: rgb(0, 0, 0);
border-radius: 5px;
padding: 10px 20px;
color: white;
}
a {
text-decoration: none;
}
</style>
</head>
<body>
<div id="container">
<div id="calculator">
<div id="result">
<div id="history">
<p id="history-value"></p>
</div>
<div id="output">
<p id="output-value"></p>
</div>
</div>
<div id="keyboard">
<button class="operator" id="clear">C</button>
<button class="operator" id="backspace">CE</button>
<button class="operator" id="%">%</button>
<button class="operator" id="/">÷</button>
<button class="number" id="7">7</button>
<button class="number" id="8">8</button>
<button class="number" id="9">9</button>
<button class="operator" id="*">×</button>
<button class="number" id="4">4</button>
<button class="number" id="5">5</button>
<button class="number" id="6">6</button>
<button class="operator" id="-">-</button>
<button class="number" id="1">1</button>
<button class="number" id="2">2</button>
<button class="number" id="3">3</button>
<button class="operator" id="+">+</button>
<button class="empty" id="empty"></button>
<button class="number" id="0">0</button>
<button class="empty" id="empty"></button>
<button class="operator" id="=">=</button>
</div>
</div>
</div>
<div class="back">
<a href="index.html" class="btn-back">back</a>
</div>
<script>
function getHistory() {
return document.getElementById("history-value").innerText;
}
function printHistory(num) {
document.getElementById("history-value").innerText = num;
}
function getOutput() {
return document.getElementById("output-value").innerText;
}
function printOutput(num) {
if (num == "") {
document.getElementById("output-value").innerText = num;
} else {
document.getElementById("output-value").innerText =
getFormattedNumber(num);
}
}
function getFormattedNumber(num) {
if (num == "-") {
return "";
}
var n = Number(num);
var value = n.toLocaleString("en");
return value;
}
function reverseNumberFormat(num) {
return Number(num.replace(/,/g, ""));
}
var operator = document.getElementsByClassName("operator");
for (var i = 0; i < operator.length; i++) {
operator[i].addEventListener("click", function () {
if (this.id == "clear") {
printHistory("");
printOutput("");
} else if (this.id == "backspace") {
var output = reverseNumberFormat(getOutput()).toString();
if (output) {
//if output has a value
output = output.substr(0, output.length - 1);
printOutput(output);
}
} else {
var output = getOutput();
var history = getHistory();
if (output == "" && history != "") {
if (isNaN(history[history.length - 1])) {
history = history.substr(0, history.length - 1);
}
}
if (output != "" || history != "") {
output = output == "" ? output : reverseNumberFormat(output);
history = history + output;
if (this.id == "=") {
var result = eval(history);
printOutput(result);
printHistory("");
} else {
history = history + this.id;
printHistory(history);
printOutput("");
}
}
}
});
}
var number = document.getElementsByClassName("number");
for (var i = 0; i < number.length; i++) {
number[i].addEventListener("click", function () {
var output = reverseNumberFormat(getOutput());
if (output != NaN) {
//if output is a number
output = output + this.id;
printOutput(output);
}
});
}
</script>
</body>
</html>