Accept a-z and 0-9 (restrict a-z to be lowercase without accents like ñ or ó)
<p>Using JQuery: While the user types, Im trying to find a way to restrict a field to only accept a-z and 0-9, restricting a-z be lowercase without accents like ñ or ó.</p>

<pre><code>&lt;input type="text" value="" id="signup_username" name="signup_username"&gt;
</code></pre>

<p>Thanks in advance.</p>
