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    <p>To elaborate a little and add some more relevant info (it took me a little while to figure out the accepted answer, and I'm clearly not alone looking at the other answers, also, the accepted answer only works for <em>one type</em> of Raphael object: it solves the original question, this is a more complete resource).</p> <hr> <h2>Detecting Raphael elements</h2> <p>Using <code>x.constructor.prototype == Raphael.el</code>, you're taking <code>x</code>, the variable that might be a Raphael <strong><em>element</em></strong> (circle, path etc - <strong>not</strong> a Raphael <code>set</code> or <code>paper</code> object) and comparing the prototype of the function that constructed it with the prototype for Raphael elements in Raphael itself (Raphael is a function object, el is a defined property of it).</p> <p>This works, but it also won't find raphael objects based on different prototypes to Raphael.el, like sets and paper objects: </p> <hr> <h2>Detecting Raphael sets</h2> <p>If you wanted to test if something was a Raphael set, the set prototype is in <code>Raphael.st</code> so you could test if a variable is a Raphael set using: </p> <p><code>someSet.constructor.prototype == Raphael.st</code></p> <hr> <h2>Detecting Raphael paper objects</h2> <p>As for the equivalent for sniffing Raphael <strong>paper</strong> objects, since they are created using <code>Raphael()</code> function, you can use: </p> <p><code>paper.constructor.prototype == Raphael.prototype</code></p> <hr> <p>The above three are basically the same as... </p> <p><code>someSet.constructor.prototype == paper.circle().constructor.prototype</code> </p> <p>...or... </p> <p><code>someSet.constructor.prototype == paper.set().constructor.prototype</code></p> <p>...or... </p> <p><code>someSet.constructor.prototype == Raphael().constructor.prototype</code></p> <p>...but without <em>actually running those functions</em>, so avoiding wasted processing (and avoiding Raphael() complaining that it hasn't been passed an ID).</p> <hr> <h2>Detecting sub-types of object (e.g. rectangle, circle...)</h2> <p>None of the above works for subtypes of Raphael elements - e.g. if you compare a circle with <code>R.rect().constructor.prototype</code>, it returns <strong><code>true</code></strong>.</p> <p>This is because both circles and rectangles are made using the <em>element</em> prototype defined in <code>Raphael.el</code>. For these, however, Raphael makes it easy:</p> <p><code>someRectangle.type == "rect"</code></p> <p><code>someCircle.type == "circle"</code></p> <p>...etc..</p>
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    1. POHow can I check if something is a Raphael object?
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    1. COThanks for the much more complete answer. I've given you the green check. :)
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    2. CODon't know if it is new but elements like sets now have a type property. You can do yourSet.type == "set".
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