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    <p>There are many features that one can use if you read the source code, although the official line is: <code>if it's not in the documentation, it is not in the api and it's not supported so do not base your code around it as it may change</code></p> <p>That being said, there are a few things that really can be quite useful. One of my favourites undocumented features is this:</p> <p><strong>Referenced Elements have a uid</strong></p> <p>Any element that has either being created or is passed on through a selector, gets assigned a property <code>uid</code>, which is incremental and unique. Since MooTools 1.4.2, this is only readable via <code>Slick.uidOf(node)</code> and not via the old element attr <code>.uid</code>. You can now use the new <code>uniqueNumber</code> property of any MooTools Element object.</p> <p>How is that being used? For starters, Element Storage. It relies on the uid as the key in the <code>Storage</code> object inside a closure, which will have anything you have <code>.store</code>'d for that element. </p> <pre><code>element.store('foo', 'bar'); </code></pre> <p>translates to:</p> <pre><code>Storage[Slick.uidOf(element)].foo = 'bar'; </code></pre> <p>and </p> <pre><code>element.retrieve('foo'); // getter of the storage key element.eliminate('foo'); // delete Storage[Slick.uidOf(element)].foo </code></pre> <p>Initializing storage for an element you have created externally, eg, via <code>var foo = document.createElement('div')</code> and not Element constructor</p> <pre><code>Slick.uidOf(foo); // makes it compatible with Storage // same as: document.id(foo); </code></pre> <p>Things that are stored by the framework into Storage also include all <code>events</code> callbacks, <code>validators</code> instances, <code>Fx</code> instances (tween, morph etc) and so forth.</p> <p>What can you do knowing the UIDs of elements? Well, cloning an element does NOT get the element's storage or events. You can actually write a new <code>Element.cloneWithStorage</code> prototype that will also copy all of the stored values you may have, which is useful upto a point - instances that reference a particular element (such as, <code>Fx.Tween</code>) will continue referencing the old element, so it may have unexpected results. This can be useful in moving your own storage, though, all you need is a similar method that will record what you have stored and allow you to clone it. </p> <p>Example Storage puncture of another Element's data:</p> <pre><code>var foo = new Element('div'), uid = foo.uniqueNumber; foo.store('foo', 'foo only'); var bar = new Element('div'); console.log(bar.retrieve('foo')); // null bar.uniqueNumber = uid; // force overwrite of uid to the other el console.log(bar.retrieve('foo')); // foo only - OH NOES console.log(Object.keys(foo)); // ["uniqueNumber"] - oh dear. enumerable! </code></pre>
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