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    <p><em>What I'll write here is true for <strong>jQuery events</strong>,<br> For vanilla javascript events read @T.J. Crowder comment at the bottom of the answer</em></p> <hr> <p><code>return false</code> inside a callback prevents the default behaviour. For example, in a <code>submit</code> event, it doesn't submit the form.</p> <p><code>return false</code> also stops bubbling, so the parents of the element won't know the event occurred. </p> <p><strong><code>return false</code> is equivalent to <code>event.preventDefault()</code> + <code>event.stopPropagation()</code></strong></p> <p>And of course, all code that exists after the <code>return xxx</code> line won't be executed. (as with all programming languages I know)</p> <p>Maybe you find this helpful:<br> <a href="https://stackoverflow.com/q/9730849/601179">Stop event bubbling - increases performance?</a></p> <hr> <p>A <em>"real"</em> demo to explain the difference between <code>return false</code> and <code>event.preventDefault()</code>:</p> <p><strong>Markup:</strong></p> <pre><code>&lt;div id="theDiv"&gt; &lt;form id="theForm" &gt; &lt;input type="submit" value="submit"/&gt; &lt;/form&gt; &lt;/div&gt;​ </code></pre> <p><strong>JavaScript:</strong> </p> <pre><code>$('#theDiv').submit(function() { alert('DIV!'); }); $('#theForm').submit(function(e) { alert('FORM!'); e.preventDefault(); });​ </code></pre> <p>Now... when the user submit the form, the first handler is the form submit, which <code>preventDefault()</code> -> the form won't be submitted, but the event bubbles to the div, triggering it's submit handler.</p> <p><a href="http://jsfiddle.net/zwY5p/" rel="nofollow noreferrer"><strong>Live DEMO</strong></a></p> <p>Now, if the form submit's handler would cancel the bubbling with <code>return false</code>:</p> <pre><code>$('#theDiv').submit(function() { alert('DIV!'); }); $('#theForm').submit(function(event) { alert('FORM!'); return false; // Or: event.preventDefault(); event.stopPropagation(); });​ </code></pre> <p>The div wouldn't even know there was a form submission.</p> <p><a href="http://jsfiddle.net/zwY5p/9/" rel="nofollow noreferrer"><strong>Live DEMO</strong></a></p> <hr> <p><strong>What does <code>return false</code> do in vanilla javascript events</strong></p> <blockquote> <p>return false from a DOM2 handler (<code>addEventListener</code>) does nothing at all (neither prevents the default nor stops bubbling; from a Microsoft DOM2-ish handler (<code>attachEvent</code>), it prevents the default but not bubbling; from a DOM0 handler (<code>onclick="return ..."</code>), it prevents the default (provided you include the return in the attribute) but not bubbling; from a jQuery event handler, it does both, because that's a jQuery thing. Details and live tests here – <strong>T.J. Crowder</strong></p> </blockquote>
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    1. POWhat does "return false;" do?
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    1. POWhat does "return false;" do?
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    1. CO+1 for answering the actual question, even as an afterthought
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    2. CO+1 Yeah, I was about to write about `stopPropagation` but saw you've already mentioned it :)
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    3. CODoes that mean if you have `e.preventDefault();` you don't need `return false;` if they both do the same thing?
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