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December 5, 2012 22:20
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Object.observer() デモ１
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| <!DOCTYPE html> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <title>Object.observer() demo1</title> | |
| <style> | |
| table, td, th { | |
| border: 2px #000000 solid; | |
| } | |
| </style> | |
| <script src="observer1.js"></script> | |
| </head> | |
| <body> | |
| <div id="event"><div>Event Code</div> | |
| <pre> | |
| obj.b = 2; // プロパティ新規作成 | |
| obj.a = 2; // プロパティ更新 | |
| Object.defineProperties(obj, {a: { enumerable: false}}); // プロパティ設定変更 | |
| delete obj.b; // プロパティ削除 | |
| </pre> | |
| </div> | |
| <div id="results"></div> | |
| </body> | |
| </html> |
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| window.addEventListener('DOMContentLoaded',function() { | |
| if (!Object.observe) { | |
| alert('Object.observe not supported in your browser. Please use Chrome Dev Channel and enable Experimental JavaScript'); | |
| return; | |
| } | |
| var obj = {a: 1}; | |
| Object.observe(obj, output); | |
| obj.b = 2; // プロパティ新規作成 | |
| obj.a = 2; // プロパティ更新 | |
| Object.defineProperties(obj, {a: { enumerable: false}}); // プロパティ設定変更 | |
| delete obj.b; // プロパティ削除 | |
| function output(changes) { | |
| var results = document.getElementById('results'); | |
| var table = document.createElement('table'); | |
| results.appendChild(table); | |
| var caption = document.createElement('caption'); | |
| caption.innerText = 'Observed Events List'; | |
| table.appendChild(caption); | |
| var thead = document.createElement('thead'); | |
| thead.innerHTML = '<tr><th>index</th><th>type</th><th>name</th><th>oldValue</th><th>currentValue</th></tr>'; | |
| table.appendChild(thead); | |
| changes.forEach(function(change, i) { | |
| var tr = document.createElement('tr'); | |
| tr.innerHTML = '<td>' + i + '</td><td>' + change.type + '</td><td>' + change.name + '</td><td>' + change.oldValue + '</td><td>' + change.object[change.name] + '</td>'; | |
| table.appendChild(tr); | |
| }); | |
| } | |
| }); |
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