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POMonitor All JavaScript Object Properties (magic getters and setters)
 

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    <p>How do I emulate PHP-style __get() and __set() magic getter/setters in JavaScript? A lot of people say that this is currently impossible. I am almost certain that it is possible because projects like nowjs (<a href="http://nowjs.com" rel="nofollow noreferrer">http://nowjs.com</a>) do something like this.</p> <p>I know that you can utilize <a href="https://developer.mozilla.org/en/JavaScript/Reference/Operators/Special/get" rel="nofollow noreferrer">get</a> and <a href="https://developer.mozilla.org/en/JavaScript/Reference/Operators/Special/set" rel="nofollow noreferrer">set</a>, but these don't work when you're not sure what the property name will be. For example, <strong>what if you wanted an event handler to execute when a new property is created</strong>?</p> <p>Example of what I'd want to do:</p> <pre><code>var obj = {}; notify(obj, function(key, value) { //key is now the name of the property being set. //value is the value of the property about to be set console.log("setting " + key + " to " + value); }); obj.foo = 2; //prints "setting foo to 2" obj.bar = {a: 2}; //prints "setting bar to [Object]" //Notice that notify() worked even though 'foo' and 'bar' weren't even defined yet! </code></pre> <p>(The question is similar to the following questions:</p> <ul> <li><a href="https://stackoverflow.com/questions/6216553/is-there-a-way-to-monitor-changes-to-an-object">Is there a way to monitor changes to an object?</a></li> <li><a href="https://stackoverflow.com/questions/994143/JavaScript-getter-for-all-properties">JavaScript getter for all properties</a></li> </ul> <p>)</p> <p><strong>EDIT:</strong> It looks like this feature is called "dynamic proxies" and should appear in the ECMAScript "Harmony" standard (probably ES6). You can read more <a href="http://wiki.ecmascript.org/doku.php?id=harmony:proxies" rel="nofollow noreferrer">here</a>. A new 'Proxy' Object is introduced with a couple methods (I.e. Create() and createFunction() ).</p> <p>One could do this:</p> <pre><code>//Constructing an object proxy (proto is optional) var proxy = Proxy.create(handler, proto); proxy.foo = 2; //Triggers 'set' function in the handler (read about it) </code></pre> <p>Bottom line here: it doesn't work in most browsers, but an implementation is available for Node.js: <a href="https://github.com/samshull/node-proxy" rel="nofollow noreferrer">node-proxy</a>.</p>
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    1. COThis feature called proxies is part of ECMAScript 6 not 5.
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    2. COGood catch. Revised my post. Thanks!
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