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copied!<p>I believe that your issue in case of <code>AlphaNumericAttribute</code> is that you did not added JavaScript adapter for your <code>alphanumeric</code> type of validator. </p> <p>You surely have somehting like this in your code:</p> <pre><code>$.validator.unobtrusive.adapters.add('ssn', function(options) { /*...*/ }); </code></pre> <p>Above code declares client side adapter for <code>SsnAttribute</code>. Note that it has name <code>ssn</code> which is the same as set in <code>ValidationType</code> property of <code>ModelClientValidationRule</code>.</p> <p>To fix issue with <code>AlphaNumericAttribute</code> you should return <code>ModelClientValidationRegexRule</code> as it is already has all necessary setup for your case (i.e. already existing adapter <code>regex</code>).</p> <pre><code>[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)] public class AlphaNumericAttribute : RegularExpressionAttribute, IClientValidatable { public AlphaNumericAttribute() : base("^[-A-Za-z0-9]+$") { } public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context) { yield return new ModelClientValidationRegexRule(FormatErrorMessage(metadata.GetDisplayName()), Pattern); } } </code></pre> <p>But if there should be additional logic on client side behind the regex validation you should write and register your own unobtrusive adapter.</p> <p>To get the bigger image and for better undestanding of how custom validation could be implemented in ASP.NET MVC you can reffer to the blog post of Brad Wilson <a href="http://bradwilson.typepad.com/blog/2010/10/mvc3-unobtrusive-validation.html">Unobtrusive Client Validation in ASP.NET MVC 3</a>, see <code>Custom adapters for unusual validators</code> section.</p>

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