Created
September 8, 2014 17:57
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| window.addEventListener('load', function main() { | |
| var plaintext, ciphertext, range; | |
| function crypt(str, n) { | |
| var i, c, result = ''; | |
| for (i = 0; i < str.length; i++) { | |
| c = str.charCodeAt(i); | |
| result += String.fromCharCode( | |
| c >= 0x41 & c < 0x41 + 26 ? (c - 0x41 + n) % 26 + 0x41 : | |
| c >= 0x61 & c < 0x61 + 26 ? (c - 0x61 + n) % 26 + 0x61 : | |
| c | |
| ); | |
| } | |
| return result; | |
| } | |
| plaintext = document.getElementById('plaintext'); | |
| ciphertext = document.getElementById('ciphertext'); | |
| range = document.getElementById('range'); | |
| function update() { | |
| ciphertext.value = crypt(plaintext.value, parseInt(range.value, 10)); | |
| } | |
| plaintext.addEventListener('keyup', update); | |
| range.addEventListener('mousemove', update); | |
| }, false); |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Caesar Cipher</title> | |
| <style> | |
| body { | |
| width: 30em; | |
| margin: 0 auto; | |
| font-family: Consolas, Meiryo, monospace; | |
| line-height: 2em; | |
| } | |
| h1, h2, a { | |
| color: #888; | |
| } | |
| h1::before, h2::before { | |
| position: absolute; | |
| margin-left: -.75em; | |
| color: #ccc; | |
| } | |
| h1::before { | |
| content: '+'; | |
| } | |
| h2::before { | |
| content: '-'; | |
| } | |
| a { | |
| padding: .2em 0; | |
| border-bottom: 2px dotted #888; | |
| text-decoration: none; | |
| } | |
| a:hover { | |
| color: #555; | |
| background: #ccc; | |
| } | |
| input { | |
| vertical-align: middle; | |
| } | |
| textarea { | |
| padding: 1em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>Caesar Cipher</h1> | |
| <h2>Plaintext</h2> | |
| <textarea id="plaintext" rows="10" cols="60"></textarea> | |
| <h2>Ciphertext</h2> | |
| <textarea id="ciphertext" rows="10" cols="60" readonly></textarea> | |
| <label>Right Shift (0 - 26): <input type="range" id="range" min="0" max="26" value="0"></label> | |
| <p>code: <a href="caesar.js">caesar.js</a></p> | |
| <script src="caesar.js"></script> | |
| </body> | |
| </html> |
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