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    <p>Use <a href="https://developer.mozilla.org/en-US/docs/DOM/element.classList" rel="noreferrer"><code>element.classList</code></a> <code>.contains</code> method:</p> <pre><code>element.classList.contains(class); </code></pre> <p>This works on all current browsers and there are polyfills to support older browsers too. </p> <hr> <p><strong>Alternatively</strong>, if you work with older browsers and don't want to use polyfills to fix them, using <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/indexOf" rel="noreferrer"><code>indexOf</code></a> is correct, but you have to tweak it a little:</p> <pre><code>function hasClass(element, className) { return (' ' + element.className + ' ').indexOf(' ' + className+ ' ') &gt; -1; } </code></pre> <p>Otherwise you will also get <code>true</code> if the class you are looking for is part of another class name.</p> <p><a href="http://jsfiddle.net/fkling/zBKCC/" rel="noreferrer"><strong>DEMO</strong></a></p> <p>jQuery uses a similar (if not the same) method.</p> <hr> <p><strong>Applied to the example:</strong></p> <p>As this does not work together with the switch statement, you could achieve the same effect with this code:</p> <pre><code>var test = document.getElementById("test"), classes = ['class1', 'class2', 'class3', 'class4']; test.innerHTML = ""; for(var i = 0, j = classes.length; i &lt; j; i++) { if(hasClass(test, classes[i])) { test.innerHTML = "I have " + classes[i]; break; } } </code></pre> <p>It's also less redundant ;)</p>
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    1. COAwesome, but how do I use that in combination with the switch statement so that I can change the output based on which classes the div contains?
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      1. USdaGUY
    2. CO@daGUY: What do you want to do with the switch statement anyway? E.g. The second `div` has two classes but it would only output `I have class1` as you are using `break`. If you want to output every class an element has, then you can just take the `className` and split it on white spaces. Or what is your actual goal?
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    3. CO@Felix Kling: I need the innerHTML of the div to change between four different strings depending on which class it contains. I just used "I have class1", etc. as examples - the real strings are all different. I will only be showing one string at a time, not combining any (hence the breaks after each case). I just want it to still work even if the matching class is one of multiple classes on the div.
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