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    <p>jQuery has the hasClass() function that returns true if any element in the wrapped set contains the specified class</p> <pre><code>if (!$(this).hasClass("selected")) { //do stuff } </code></pre> <p><a href="http://jsbin.com/ugaxe" rel="noreferrer">Take a look at my example of use</a></p> <ul> <li>If you hover over a div, it fades as normal speed to 100% opacity if the div does not contain the 'selected' class</li> <li>If you hover out of a div, it fades at slow speed to 30% opacity if the div does not contain the 'selected' class</li> <li>Clicking the button adds 'selected' class to the red div. The fading effects no longer work on the red div</li> </ul> <p>Here is the code for it</p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"&gt; &lt;head&gt; &lt;script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js"&gt;&lt;/script&gt; &lt;title&gt;Sandbox&lt;/title&gt; &lt;meta http-equiv="Content-type" content="text/html; charset=utf-8" /&gt; &lt;style type="text/css" media="screen"&gt; body { background-color: #FFF; font: 16px Helvetica, Arial; color: #000; } &lt;/style&gt; &lt;!-- jQuery code here --&gt; &lt;script type="text/javascript"&gt; $(function() { $('#myButton').click(function(e) { $('#div2').addClass('selected'); }); $('.thumbs').bind('click',function(e) { alert('You clicked ' + e.target.id ); } ); $('.thumbs').hover(fadeItIn, fadeItOut); }); function fadeItIn(e) { if (!$(e.target).hasClass('selected')) { $(e.target).fadeTo('normal', 1.0); } } function fadeItOut(e) { if (!$(e.target).hasClass('selected')) { $(e.target).fadeTo('slow', 0.3); } } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="div1" class="thumbs" style=" background-color: #0f0; margin: 10px; padding: 10px; width: 100px; height: 50px; clear: both;"&gt; One div with a thumbs class &lt;/div&gt; &lt;div id="div2" class="thumbs" style=" background-color: #f00; margin: 10px; padding: 10px; width: 100px; height: 50px; clear: both;"&gt; Another one with a thumbs class &lt;/div&gt; &lt;input type="button" id="myButton" value="add 'selected' class to red div" /&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><strong>EDIT:</strong></p> <p>this is just a guess, but are you trying to <a href="http://jsbin.com/adana" rel="noreferrer">achieve something like this</a>? </p> <ul> <li>Both divs start at 30% opacity</li> <li>Hovering over a div fades to 100% opacity, hovering out fades back to 30% opacity. Fade effects only work on elements that don't have the 'selected' class</li> <li>Clicking a div adds/removes the 'selected' class</li> </ul> <p>jQuery Code is here-</p> <pre><code>$(function() { $('.thumbs').bind('click',function(e) { $(e.target).toggleClass('selected'); } ); $('.thumbs').hover(fadeItIn, fadeItOut); $('.thumbs').css('opacity', 0.3); }); function fadeItIn(e) { if (!$(e.target).hasClass('selected')) { $(e.target).fadeTo('normal', 1.0); } } function fadeItOut(e) { if (!$(e.target).hasClass('selected')) { $(e.target).fadeTo('slow', 0.3); } } &lt;div id="div1" class="thumbs" style=" background-color: #0f0; margin: 10px; padding: 10px; width: 100px; height: 50px; clear: both; cursor:pointer;"&gt; One div with a thumbs class &lt;/div&gt; &lt;div id="div2" class="thumbs" style=" background-color: #f00; margin: 10px; padding: 10px; width: 100px; height: 50px; clear: both; cursor:pointer;"&gt; Another one with a thumbs class &lt;/div&gt; </code></pre>
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    1. COdoesn't work for some reason :( $(".thumbs").hover(function(){ if (!($(this).hasClass(".selected")){ $(this).stop().fadeTo("normal", 1.0); },function(){ $(this).stop().fadeTo("slow", 0.3); } }); and it breaks my entire code, none of the JS works with that added
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    2. COdoes hasClass require the .? hasClass('selected') instead of hasClass('.selected')
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    3. CORuss' example may work if you use "selected" instead of ".selected"?
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