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copied!<p>Use Dojo 1.6. Dijit's has a new "watch" functionality that does what you want nicely. It allows other objects (i.e. the observers) to dynamically add callbacks which will be triggered when properties in the class change.</p> <p>However, you really don't want an observer pattern. What you want is to do something when status is set on your class. This is deterministic; you are not saying that an arbitrary number of observer objects are now interested in what status is set to.</p> <p>In this case, you can simly define an "_attributeMap" in the class, which autotically maps certain properties/attributes to attributes of DOM elements inside that class. In your example, you can declare and attribute map on the status attribute mapping to the style of the class. </p> <p>You can also provide a _setXxxAttr function to add more functionalities instead of straight mapping.</p> <p>Your example is not proper Dojo. It should be this:</p> <pre><code>dojo.declare("ELEMENT", null, { id: 0, status: '', /*constructor: no need. automatic.*/ _setStatusAttr: function(value) { this.status = value; dojo.style("someDomNode", "background-color", value === 'foo' ? "yellow" : "blue"); } }); var newelement = new ELEMENT({id:123, status:'hello'}); newelement.get("id"); // Get id = 123 newelement.set("status", 'foo'); // Set status to 'foo'. _setStatusAttr is automatically run. newelement.get("status"); // Get status = 'foo' </code></pre> <p>In Dojo lingo, <code>_setXxxAttr</code> automatically redirects on the <code>set("xxx", value)</code> call.</p>

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