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copied!<p>It looks like there are a couple of things going on. First, as <a href="https://stackoverflow.com/users/726938/jayp">jayp</a> points out in his comment, you aren't defining what <code>myText</code> is.</p> <p>Secondly, I think you're over-complicating this a bit. How about trying something like this:</p> <p>Give your text input an <code>ID</code>, something like <code><input type="text" id="myText" /></code></p> <p>Then use something like this:</p> <pre><code>// Assign our text input to a variable var myText = document.getElementById("myText"); // Capture keyDown events myText.onkeydown = function(e) { // "38" is the up arrow key if (e.keyCode == 38) { // increment the value in the text input myText.value++; // "40" is the down arrow key } else if (e.keyCode == 40) { // decrement the value in the text input myText.value--; } } </code></pre> <p>This is a pretty simplified example, but should get you pointed in the right direction. Hope it helps.</p> <p><a href="http://jsfiddle.net/bVJYF/" rel="nofollow noreferrer">See a working example at JSFiddle</a></p> <p><strong>Edit:</strong></p> <p>It's not working in your case because the script is trying to find the <code>input</code> element <em>before</em> the page is fully loaded. You can move your script to the bottom of the page like this:</p> <pre><code><html> <head></head> <body> <input type="text" id="myText" /> <script type="text/javascript" src="number.js"></script> </body> </html> </code></pre>

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