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December 5, 2012 22:23
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Object.observer() デモ２
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| <!DOCTYPE html> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <title>Object.observer() demo2</title> | |
| <style> | |
| table, td, th { | |
| border: 2px #000000 solid; | |
| } | |
| </style> | |
| <script src="observer2.js"></script> | |
| </head> | |
| <body> | |
| <div id="event"><div>Event Code</div> | |
| <pre> | |
| var first_time = obj2.seen; // 時間参照イベント | |
| obj2.seen = new Date(); // 時間更新イベント | |
| var second_time = obj2.seen; // 時間参照イベント | |
| </pre> | |
| </div> | |
| <div id="seen"></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 obj2 = {_time: new Date(0)}; | |
| var notifier = Object.getNotifier(obj2); | |
| Object.defineProperties(obj2, { | |
| _time: { | |
| enumerable: false, | |
| configrable: false | |
| }, | |
| seen: { | |
| set: function(val) { | |
| var notifier = Object.getNotifier(this); | |
| notifier.notify({ | |
| type: 'time_updated', // 時間更新イベントの定義 | |
| name: 'seen', | |
| oldValue: this._time | |
| }); | |
| this._time = val; | |
| }, | |
| get: function() { | |
| var notifier = Object.getNotifier(this); | |
| notifier.notify({ | |
| type: 'time_read', // 時間参照イベントの定義 | |
| name: 'seen', | |
| oldValue: this._time | |
| }); | |
| return this._time; | |
| } | |
| } | |
| }); | |
| Object.observe(obj2, output); | |
| var seen = document.getElementById('seen'); | |
| var first_seen = document.createElement('div'); | |
| var first_time = obj2.seen; // 時間参照イベント | |
| first_seen.innerText = 'first_seen:' + first_time; | |
| seen.appendChild(first_seen); | |
| obj2.seen = new Date(); // 時間更新イベント | |
| var second_seen = document.createElement('div'); | |
| var second_time = obj2.seen; // 時間参照イベント | |
| second_seen.innerText = 'second_seen:' + second_time; | |
| seen.appendChild(second_seen); | |
| 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></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>'; | |
| table.appendChild(tr); | |
| }); | |
| } | |
| }); |
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