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    <p>[<b>edit</b>] Let's add this disclaimer: this use of <code>switch</code> is considered EVIL or ABUSIVE. Some Disciples Of The Javascript also consider the use of <em>ternaries</em> as a major SIN. So beware of using them, because <a href="http://www.reddit.com/r/javascript/comments/eoq10/the_javascript_cockroach_from_hell/" rel="nofollow">hell</a> may await you, so the Gospel goes.</p> <p>You can use <code>switch</code> like this <sup><b>1</b></sup>:</p> <pre><code>switch (true) { case (parseInt(charCode) &gt;= 65 &amp;&amp; parseInt(charCode) &lt;=90): //UPPERCASE alert("UP"); break; case (parseInt(charCode) &gt;= 97 &amp;&amp; parseInt(charCode) &lt;=122): //LOWERCASE alert("LO"); break; case (parseInt(charCode) &gt;= 48 &amp;&amp; parseInt(charCode) &lt;=57): //NNUMBERS alert("NUM"); break; default: break } </code></pre> <p>it's pretty bulky. You don't have to use <code>parseInt</code> if you derive <code>charCode</code> came from <code>event.keyCode</code>. If you need to use <code>parseInt</code>, don't forget to provide the <a href="http://www.devguru.com/technologies/ecmascript/quickref/parseint.html" rel="nofollow">radix</a>, or better still, use <code>Number</code> to convert to a number.</p> <p>Anyway using a <a href="http://en.wikipedia.org/wiki/Ternary" rel="nofollow">ternary</a> is an alternative for this:</p> <pre><code>alert( charCode &gt;= 65 &amp;&amp; charCode &lt;= 90 ? 'UP' : charCode &gt;= 97 &amp;&amp; charCode &lt;= 122 ? 'LO' : charCode &gt;= 48 &amp;&amp; charCode &lt;= 57 ? 'NUM' : 'OTHER' ); </code></pre> <p>[<strong><em>edit</em></strong>] Let's see if the following alternative can satisfy the church of Javascript Coders...</p> <p>Another alternative is using a <code>RegExp</code> with the character derived from the <code>keyCode</code>:</p> <pre><code>var chr = String.fromCharCode(charCode), alertval = /[a-z]/.test(chr) ? 'LO' : /[A-Z]/.test(chr) ? 'UP' : /[0-9]/.test(chr) ? 'NUM' : 'OTHER'; alert(alertval); </code></pre> <p>As a last alternative (man, javascript is <em>so</em> versatile!) I present:</p> <pre><code>var check = String.fromCharCode(charCode) .replace(/([a-z])|([A-Z])|([0-9])|(.+)/, function(a,b,c,d) { return b ? 'LO' : c ? 'UP' : d ? 'NUM' : 'OTH'; }); </code></pre> <p><sup><b>1</b></sup> <a href="http://getmockery.com/blog/archives/80" rel="nofollow">some notes</a> on that 'trick'</p>
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    1. COWhat ... a ... *horrible* ...idea. :-) Still, though, it should *work*, cases *are* evaluated in order.
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    2. COThanks, I remembered that's how to do it. It is the exact correct method and far better than a string of ugly if else statements.
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    3. CO@thebounder: Ugliness, like beauty, is in the eye of the beholder. :-)
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