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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>iOS style calculator</title>
<link href="https://fonts.googleapis.com/css?family=Roboto:300,400" rel="stylesheet">
<style>
.container {
background: yellow;
display: grid;
grid-template-columns: repeat(4, 1fr);
grid-template-rows: 2fr 1fr 1fr 1fr 1fr 1fr;
height: 70vh;
width: 25vw;
font-family: Roboto;
font-weight: 300;
}
.result {
display: flex;
align-items:flex-end;
justify-content: flex-end;
padding: 10px;
font-size: 3em;
background: #161616;
grid-column-start: 1;
grid-column-end: 5;
color: #fff;
}
.button {
display: flex;
align-items: center;
justify-content: center;
background: #C6C7CA;
border: 1px solid #666;
cursor: pointer;
font-size: 1.2em;
}
.button:active {
opacity: 0.96;
}
.isGray {
background: #CDCDCF;
}
.isOrange {
background: #FF9000;
}
.zero {
grid-column-start: 1;
grid-column-end: 3;
justify-content: flex-start;
padding-left: 35px;
}
</style>
</head>
<body>
<div class="container">
<div class="result" id="result">0</div>
<div class="button isGray" id="reset" onclick="calc(this);">AC</div>
<div class="button isGray" id="revertNumber" onclick="calc(this);">+/-</div>
<div class="button isGray" id="percent" onclick="calc(this);">%</div>
<div class="button isOrange" id="divide" onclick="calc(this);">/</div>
<div class="button" id="7" onclick="calc(this);">7</div>
<div class="button" id="8" onclick="calc(this);">8</div>
<div class="button" id="9" onclick="calc(this);">9</div>
<div class="button isOrange" id="multiply" onclick="calc(this);">X</div>
<div class="button" id="4" onclick="calc(this);">4</div>
<div class="button" id="5" onclick="calc(this);">5</div>
<div class="button" id="6" onclick="calc(this);">6</div>
<div class="button isOrange" id="substract" onclick="calc(this);">-</div>
<div class="button" id="1" onclick="calc(this);">1</div>
<div class="button" id="2" onclick="calc(this);">2</div>
<div class="button" id="3" onclick="calc(this);">3</div>
<div class="button isOrange" id="add" onclick="calc(this);">+</div>
<div class="button zero" id="0" onclick="calc(this);">0</div>
<div class="button" id="decimal" onclick="calc(this);">,</div>
<div class="button isOrange" id="equals" onclick="calc(this);">=</div>
</div>
<script type="text/javascript">
let screen = document.getElementById("result");
let lastClicked = "";
let cursor = "";
function calc(num) {
let calcEvent = num.id;
switch (calcEvent) {
case "reset":
lastclicked = "";
cursor = "";
screen.innerHTML = 0;
break;
case "revertNumber":
lastclicked = "";
cursor = "";
screen.innerHTML -= eval(screen.innerHTML * 2);
break;
case "percent":
screen.innerHTML = eval(screen.innerHTML / 100);
break;
case "divide":
if (lastClicked != "divide" && cursor != "symbol") {
screen.innerHTML = screen.innerHTML + "/";
lastClicked = "divide";
cursor = "symbol";
} else if (cursor == "symbol") {
screen.innerHTML = screen.innerHTML.slice(0, -1) + "/";
lastClicked = "divide";
cursor = "symbol";
} else {
screen.innerHTML = screen.innerHTML + "/";
lastClicked = "divide";
cursor = "symbol";
}
break;
case "multiply":
if (lastClicked != "multiply" && cursor != "symbol") {
screen.innerHTML = screen.innerHTML + "*";
lastClicked = "multiply";
cursor = "symbol";
} else if (cursor == "symbol") {
screen.innerHTML = screen.innerHTML.slice(0, -1) + "*";
lastClicked = "multiply";
cursor = "symbol";
} else {
screen.innerHTML = screen.innerHTML + "*";
lastClicked = "multiply";
cursor = "symbol";
}
break;
case "substract":
if (lastClicked != "substract" && cursor != "symbol") {
screen.innerHTML = screen.innerHTML + "-";
lastClicked = "substract";
cursor = "symbol";
} else if (cursor == "symbol") {
screen.innerHTML = screen.innerHTML.slice(0, -1) + "-";
lastClicked = "substract";
cursor = "symbol";
} else {
screen.innerHTML = screen.innerHTML + "-";
lastClicked = "substract";
cursor = "symbol";
}
break;
case "add":
if (lastClicked != "add" && cursor != "symbol") {
screen.innerHTML = screen.innerHTML + "+";
lastClicked = "add";
cursor = "symbol";
} else if (cursor == "symbol") {
screen.innerHTML = screen.innerHTML.slice(0, -1) + "+";
lastClicked = "add";
cursor = "symbol";
} else {
screen.innerHTML = screen.innerHTML + "+";
lastClicked = "add";
cursor = "symbol";
}
break;
case "decimal":
lastclicked = "";
cursor = "";
screen.innerHTML = screen.innerHTML + ".";
break;
case "0":
lastclicked = "";
cursor = "";
if (screen.innerHTML != 0) {
screen.innerHTML = screen.innerHTML + 0;
}
break;
case "1":
case "2":
case "3":
case "4":
case "5":
case "6":
case "7":
case "8":
case "9":
lastclicked = "";
cursor = "";
if (screen.innerHTML != 0 || screen.innerHTML == "0.") {
screen.innerHTML = screen.innerHTML + num.id;
} else {
screen.innerHTML = num.id;
}
break;
case "equals":
screen.innerHTML = eval(screen.innerHTML);
if (screen.innerHTML == "Infinity") {
screen.innerHTML = "Error";
} else if (screen.innerHTML == "NaN") {
screen.innerHTML = "Error";
}
}
}
</script>
</body>
</html>