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copied!<p><strong>Edit</strong>: I've been reading Closure: The Definitive Guide, and I just realized that you can simply add the <a href="http://code.google.com/closure/compiler/docs/js-for-compiler.html#tag-this" rel="nofollow noreferrer"><code>/** @this {Element} */</code> annotation</a> before your event handler to make Closure Compiler stop complaining.</p> <p>See the <a href="https://developers.google.com/closure/compiler/docs/error-ref#warn" rel="nofollow noreferrer">Closure Compiler warning reference</a>. The Closure Compiler gives this warning when you use <code>this</code> within a function that is not either annotated <code>/** @constructor */</code> or is within the <code>prototype</code> of a class. The compiler assumes that you'll never use <code>this</code> when a function is called in the context of another object (which is what event callbacks do).</p> <p>Some places that you might have to change to make Closure Compiler stop complaining with this warning:</p> <ul> <li>Don't use <code>link.onclick = ...</code> directly, because you have to mess with <code>this</code> and <code>e || window.event</code>. Instead, use jQuery to wrap the event handler, since <a href="http://api.jquery.com/category/events/event-object/" rel="nofollow noreferrer">jQuery's event object has <code>e.currentTarget</code></a>.</li> <li>If you're using <code>this</code> within a <code>jQuery.each</code>, replace <code>this</code> with the second parameter of your function. E.g., <code>jQuery.each([1, 2, 3], function(i, val) { ... val ... };</code>.</li> </ul>

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