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input[type="calc"]
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| <!DOCTYPE html> | |
| <html> | |
| <head lang="en"> | |
| <meta charset="UTF-8"> | |
| <title></title> | |
| </head> | |
| <body> | |
| <h1>input[type="calc"]</h1> | |
| <p>Usable for complicated input that require a calculator.</p> | |
| <p> | |
| <input type="calc" placeholder="Supports calculations, eg: (5 * 5 + 100) / 5" size="100"> | |
| </p> | |
| <p> | |
| <input type="text" placeholder="Normal text input" size="100"> | |
| </p> | |
| <script> | |
| (function() { | |
| function inputCalc(ev) { | |
| var el = ev.target; | |
| if(!(el.nodeName == 'INPUT' && el.getAttribute('type') == 'calc')) { | |
| return; | |
| } | |
| var val = el.value | |
| .replace(/,/g, '.') // replace commas with dots | |
| .replace(/[a-z]/gi, ''); // simple sanitizing to remove JS calls | |
| try { | |
| var result = new Function('return '+ val)(); | |
| if(!isNaN(result)) { | |
| el.value = result; | |
| } else { | |
| throw new Error('Result is not a number.'); | |
| } | |
| } catch(err) { | |
| el.value = el.defaultValue; | |
| } | |
| } | |
| window.addEventListener("blur", inputCalc, true); | |
| })(); | |
| </script> | |
| </body> | |
| </html> |
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