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    <p>Not sure how you would inject javascript as you describe, but you may want to consider using the <a href="http://www.tsjensen.com/blog/2010/03/11/ASPNET+MVC+2+MinStringLength+Custom+Validation+Attribute.aspx" rel="nofollow noreferrer">custom validation pattern for ASP.NET MVC 2</a>.</p> <p>Important pieces are the ValidationAttribute, DataAnnotationsModelValidator, registering the validator in Application_Start with DataAnnotationsModelValidatorProvider.RegisterAdapter, and the client side Sys.Mvc.ValidatorRegistry.validators function collection to register your client side validation code. </p> <p>Here's the example code from my post.</p> <pre><code>[RegularExpression("[\\S]{6,}", ErrorMessage = "Must be at least 6 characters.")] public string Password { get; set; } [StringLength(128, ErrorMessage = "Must be under 128 characters.")] [MinStringLength(3, ErrorMessage = "Must be at least 3 characters.")] public string PasswordAnswer { get; set; } public class MinStringLengthAttribute : ValidationAttribute { public int MinLength { get; set; } public MinStringLengthAttribute(int minLength) { MinLength = minLength; } public override bool IsValid(object value) { if (null == value) return true; //not a required validator var len = value.ToString().Length; if (len &lt; MinLength) return false; else return true; } } public class MinStringLengthValidator : DataAnnotationsModelValidator&lt;MinStringLengthAttribute&gt; { int minLength; string message; public MinStringLengthValidator(ModelMetadata metadata, ControllerContext context, MinStringLengthAttribute attribute) : base(metadata, context, attribute) { minLength = attribute.MinLength; message = attribute.ErrorMessage; } public override IEnumerable&lt;ModelClientValidationRule&gt; GetClientValidationRules() { var rule = new ModelClientValidationRule { ErrorMessage = message, ValidationType = "minlen" }; rule.ValidationParameters.Add("min", minLength); return new[] { rule }; } } protected void Application_Start() { RegisterRoutes(RouteTable.Routes); DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(MinStringLengthAttribute), typeof(MinStringLengthValidator)); } Sys.Mvc.ValidatorRegistry.validators["minlen"] = function(rule) { //initialization var minLen = rule.ValidationParameters["min"]; //return validator function return function(value, context) { if (value.length &lt; minLen) return rule.ErrorMessage; else return true; /* success */ }; }; </code></pre>
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    1. POASP MVC 2 Validation : Passing Javascript code to the client
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    1. USTyler Jensen
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    1. COI should note that this code resolved a specific issue in MVC 2 on .NET 3.5. It's no longer needed in .NET 4.0 since they added the min length attribute into the component library classes. Still, this gives you a good example of how to hook up custom client side validation to extend standard MVC 2 client side validators.
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    2. COThank for your comments However, the main issue is how to pass Javascript code not how to do custom validation Very often, you need to pass Javascript code in such Validation routines
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    3. COUnderstood. I think that the only way you can "inject" javascript code, because of the nature of the browser, is to emit the javascript as part of your HTML output. You may be able to write a <script> to the DOM and then call the function declared in the DOM, but I've never tried that.
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