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html+javascript to do flat permutations
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <title> flat permutation </title> | |
| <script> | |
| function myMain(event){ | |
| document.getElementById("topbox").innerHTML = "<h1> HELLO </h1>"; | |
| document.getElementById('answertext').addEventListener('keydown', (ev) => { | |
| if (ev.key === 'Enter') { | |
| update_perm(parseInt(ev.target.value)); | |
| } | |
| }); | |
| } | |
| function update_perm(val){ | |
| console.log("Foo"); | |
| const a = Array.apply(null, Array(val)).map(function (_, i){return i;}); | |
| const b = Array(); | |
| while( a.length > 0 ){ | |
| var idx = Math.floor(Math.random()*a.length); | |
| b.push(a[idx]); | |
| a.splice(idx,1); | |
| } | |
| document.getElementById("topbox").innerHTML = "<h1>"+b.toString()+"</h1>"; | |
| } | |
| // Tell the page to run myMain after the page (HTML) is loaded | |
| document.addEventListener('DOMContentLoaded', myMain, false); | |
| </script> | |
| </head> | |
| <body> | |
| <div id="topbox"></div> | |
| <div id="shortcuts"> | |
| <button onclick="update_perm(2)">2</button> | |
| <button onclick="update_perm(3)">3</button> | |
| <button onclick="update_perm(4)">4</button> | |
| <button onclick="update_perm(5)">5</button> | |
| <button onclick="update_perm(6)">6</button> | |
| <button onclick="update_perm(7)">7</button> | |
| </div> | |
| <br> | |
| <div id="answerbox"> | |
| <input id="answertext" type="text" id="ans"> | |
| </div> | |
| </body> | |
| </html> |
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