Created
February 25, 2016 04:38
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Vanilla JS Calculator
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| var buttons = document.querySelectorAll('.button'); | |
| var output = document.querySelector('.output'); | |
| var action = null; | |
| var current = 0; | |
| var actions = { | |
| '±': ' - ', | |
| '%': ' % ', | |
| '÷': ' / ', | |
| '×': ' * ', | |
| '−': ' - ', | |
| '+': ' + ', | |
| }; | |
| for (button in buttons) { | |
| buttons[button].onclick = function (e) { | |
| var input = e.target.innerText; | |
| var num = parseInt(input); | |
| if (isNaN(num)) { | |
| if (input === 'C') { | |
| console.log('clear'); | |
| action = null; | |
| current = 0; | |
| output.innerText = 0; | |
| } else { | |
| if (action && action !== '=') { | |
| var calculation = current + actions[action] + output.innerText; | |
| console.log('calculate', calculation); | |
| output.innerText = eval(calculation); | |
| } | |
| current = parseInt(output.innerText); | |
| action = input; | |
| } | |
| } else { | |
| if (current === parseInt(output.innerText)) { | |
| output.innerText = num; | |
| } else { | |
| output.innerText += num; | |
| } | |
| } | |
| console.log({ | |
| action: action, | |
| current: current, | |
| input: input, | |
| }); | |
| }; | |
| } | |
| document.addEventListener('keypress', function (e) { | |
| if (e.which > 47 && e.which < 58) { | |
| console.log('numbers!'); | |
| } | |
| }); |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Vanilla JS Calculator</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <link rel="stylesheet" href="styles.css"> | |
| </head> | |
| <body> | |
| <div class="calculator"> | |
| <div class="output">0</div> | |
| <div class="button">C</div> | |
| <div class="button">±</div> | |
| <div class="button">%</div> | |
| <div class="button accent">÷</div> | |
| <div class="button">7</div> | |
| <div class="button">8</div> | |
| <div class="button">9</div> | |
| <div class="button accent">×</div> | |
| <div class="button">4</div> | |
| <div class="button">5</div> | |
| <div class="button">6</div> | |
| <div class="button accent">−</div> | |
| <div class="button">1</div> | |
| <div class="button">2</div> | |
| <div class="button">3</div> | |
| <div class="button accent">+</div> | |
| <div class="button double">0</div> | |
| <div class="button">.</div> | |
| <div class="button submit">=</div> | |
| </div> | |
| <script src="calculator.js"></script> | |
| </body> | |
| </html> |
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| @import url(https://fonts.googleapis.com/css?family=Montserrat); | |
| body { | |
| background: #3e4149; | |
| color: rgba(255,255,255,.2); | |
| font: 200% Montserrat; | |
| height: 100vh; | |
| margin: 0; | |
| text-align: center; | |
| } | |
| .calculator { | |
| height: 100%; | |
| margin: 0 auto; | |
| max-width: 375px; | |
| } | |
| .output { | |
| box-sizing: border-box; | |
| color: #fd999a; | |
| font-size: 48pt; | |
| height: 25%; | |
| padding: 10% 5% 5%; | |
| text-align: right; | |
| } | |
| .button { | |
| box-sizing: border-box; | |
| cursor: pointer; | |
| float: left; | |
| height: 15%; | |
| padding: 5%; | |
| transition: .5s; | |
| width: 25%; | |
| } | |
| .button:hover { | |
| background: #444f59; | |
| color: #fff; | |
| } | |
| .double { | |
| width: 50%; | |
| } | |
| .accent:hover { | |
| color: #fd999a; | |
| } | |
| .submit:hover { | |
| background: #fd999a; | |
| } |
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