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POObject.watch() for all browsers?
 

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    <p><strong>Please be sure to read all the comments below. Object.Watch and Object.Observe are both deprecated. See Elliot B's comment for an updated (as of Jun 2018) method.</strong></p> <hr> <p>I was looking for an easy way to monitor an object or variable for changes, and I found <code>Object.watch()</code>, that's supported in Mozilla browsers, but not IE. So I started searching around to see if anyone had written some sort of equivalent. </p> <p>About the only thing I've found has been <a href="http://plugins.jquery.com/watch/" rel="noreferrer">a jQuery plugin</a>, but I'm not sure if that's the best way to go. I certainly use jQuery in most of my projects, so I'm not worried about the jQuery aspect...</p> <p>Anyway, the question: Can someone show me a working example of that jQuery plugin? I'm having problems making it work... </p> <p>Or, does anyone know of any better alternatives that would work cross browser?</p> <p><strong>Update after answers</strong>:</p> <p>Thanks everyone for the responses! I tried out the code posted here: <a href="http://webreflection.blogspot.com/2009/01/internet-explorer-object-watch.html" rel="noreferrer">http://webreflection.blogspot.com/2009/01/internet-explorer-object-watch.html</a></p> <p>But I couldn't seem to make it work with IE. The code below works fine in Firefox, but does nothing in IE. In Firefox, each time <code>watcher.status</code> is changed, the <code>document.write()</code> in <code>watcher.watch()</code> is called and you can see the output on the page. In IE, that doesn't happen, but I can see that <code>watcher.status</code> is updating the value, because the last <code>document.write()</code> call shows the correct value (in both IE and FF). But, if the callback function isn't called, then that's kind of pointless... :)</p> <p>Am I missing something?</p> <pre><code>var options = {'status': 'no status'}, watcher = createWatcher(options); watcher.watch("status", function(prop, oldValue, newValue) { document.write("old: " + oldValue + ", new: " + newValue + "&lt;br&gt;"); return newValue; }); watcher.status = 'asdf'; watcher.status = '1234'; document.write(watcher.status + "&lt;br&gt;"); </code></pre>
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    1. COIIRC you can use onPropertyChange in IE
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    2. COReplace document.write() with alert(). It should work just fine.
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