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June 25, 2022 10:08
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A dead simple calculator written in HTML, CSS and pure JS.
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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" /> | |
| <title>Dead simple JS Calculator</title> | |
| <style> | |
| body { | |
| background-color: whitesmoke; | |
| margin: 0; | |
| height: 100vh; | |
| display: flex; | |
| align-items: center; | |
| justify-content: center; | |
| } | |
| .container { | |
| font-size: 2.5em; | |
| } | |
| </style> | |
| <!-- Calculator CSS / START --> | |
| <style> | |
| .calc { | |
| --c-size: 2em; | |
| --c-gap: .4em; | |
| max-width: calc((var(--c-size) + var(--c-gap) * 2) * 4); | |
| display: grid; | |
| grid-template-columns: repeat(4, 1fr); | |
| gap: var(--c-gap); | |
| justify-items: center; | |
| } | |
| .calc > * { | |
| height: var(--c-size); | |
| background: #fff; | |
| border-radius: 1em; | |
| font-size: 1em; | |
| } | |
| .calc > input { | |
| width: calc(var(--c-size) * 3); | |
| padding: 0 .75em; | |
| text-align: right; | |
| border: none; | |
| grid-column: 1 / 4; | |
| } | |
| .calc > button { | |
| width: var(--c-size); | |
| text-align: center; | |
| border: none; | |
| } | |
| .calc > button:nth-child(4n + 2) { | |
| background: #4a90e2; | |
| color: #fff; | |
| } | |
| .calc > button:active { | |
| background: red; | |
| color: #fff; | |
| } | |
| </style> | |
| <!-- Calculator CSS / END --> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <!-- Calculator HTML / START --> | |
| <div class="calc"> | |
| <input type="text" /> | |
| <button>C</button> | |
| <button>7</button> | |
| <button>8</button> | |
| <button>9</button> | |
| <button>÷</button> | |
| <button>4</button> | |
| <button>5</button> | |
| <button>6</button> | |
| <button>×</button> | |
| <button>1</button> | |
| <button>2</button> | |
| <button>3</button> | |
| <button>-</button> | |
| <button>.</button> | |
| <button>0</button> | |
| <button>=</button> | |
| <button>+</button> | |
| </div> | |
| <!-- Calculator HTML / END --> | |
| </div> | |
| <!-- Calculator JS / START --> | |
| <script> | |
| (function () { | |
| const display = document.querySelector(".calc > input") | |
| document.querySelectorAll(".calc > button").forEach((e) => { | |
| if ("=" === e.innerText) | |
| e.onclick = () => | |
| (display.value = eval( | |
| display.value | |
| .replace(/÷/g, "/") | |
| .replace(/×/g, "*") | |
| .replace(/[^\d-/*+.]/g, "") | |
| )) | |
| else if ("C" === e.innerText) e.onclick = () => (display.value = "") | |
| else e.onclick = () => (display.value += e.innerText) | |
| }) | |
| })() | |
| </script> | |
| <!-- Calculator JS / END --> | |
| </body> | |
| </html> |
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Live preview HERE! 😄