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    <p>I made some progress but I am not quite happy.</p> <p><strong>Problem #1:</strong> The client validation metadata is not generated unless you have a Html.BeginForm() in your partial. Which in my case is false because I do not update the entire form, I update portions of it.</p> <p><strong>Solution for Problem #1:</strong> Add a form in the partial view, let MVC generate the client validation MetaData and remove the form tags with a action filter. Let's call this <strong>Hack #1</strong>.</p> <pre><code>public class RemoveFormFilterAttribute : ActionFilterAttribute { private static readonly MethodInfo SwitchWriterMethod = typeof(HttpResponse).GetMethod("SwitchWriter", BindingFlags.Instance | BindingFlags.NonPublic); private TextWriter _OriginalWriter; public override void OnActionExecuting(ActionExecutingContext filterContext) { _OriginalWriter = (TextWriter)SwitchWriterMethod.Invoke(HttpContext.Current.Response, new object[] {new HtmlTextWriter(new StringWriter())}); } public override void OnResultExecuted(ResultExecutedContext filterContext) { if (_OriginalWriter != null) { HtmlTextWriter lTextWriter =(HtmlTextWriter) SwitchWriterMethod.Invoke(HttpContext.Current.Response, new object[] {_OriginalWriter}); string lOriginalHTML = lTextWriter.InnerWriter.ToString(); string lNewHTML = RemoveFormTags(lOriginalHTML); filterContext.HttpContext.Response.Write(lNewHTML); } } </code></pre> <p><strong>Problem #2:</strong> The initial client validation metadata for the page is gone by the time I have the metaData for the new content.</p> <p><strong>Solution for Problem #2:</strong> Store the initial metadata (hard copy) and update it with the new fieds, than call the methods you mentioned to let MVC know new stuff arrived. Let's call this <strong>Hack #2.</strong></p> <pre><code>&lt;script type="text/javascript"&gt; var pageMvcClientValidationMetadata; $(document).ready(function() { $("input[name='PaymentTypeName']").change(PaymentTypeChanged); //create a back-up of the ValidationMetadata pageMvcClientValidationMetadata = JSON.parse(JSON.stringify(window.mvcClientValidationMetadata)); }); function PaymentTypeChanged() { var selectedPaymentType = $("input[name='PaymentTypeName']:checked").val(); $.ajax( { url: 'PersonalData/GetPaymentTypeHtml?&amp;paymentType=' + selectedPaymentType, type: "GET", cache: false, success: GetPaymentTypeHtml_Success }); } function GetPaymentTypeHtml_Success(result) { $('#divPaymentTypeDetails').html(result); UpdateValidationMetaData(); } function UpdateValidationMetaData() { //update the ValidationMetadata for (i = 0; i &lt; window.mvcClientValidationMetadata[0].Fields.length; i++) { pageMvcClientValidationMetadata[0].Fields.push(window.mvcClientValidationMetadata[0].Fields[i]); } //restore the ValidationMetadata window.mvcClientValidationMetadata = JSON.parse(JSON.stringify(pageMvcClientValidationMetadata)); //Notify the Validation Framework that new Metadata exists Sys.Application.remove_load(arguments.callee); Sys.Mvc.FormContext._Application_Load(); } </code></pre> <p></p> <p>Now. Any improvements would be appreciated.</p> <p><strong>Hack #1:</strong> How can I generate the client validation metadata without having an actual form ?</p> <p><strong>HAck #2:</strong> How can I appent to the page validation metadata ?</p>
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    1. USRadu Negrila
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    1. COThe last 2 calls seem to work only the first time. I didn't manage to find out why. It could be because I don't resend the whole form. I don't know... I'm giving up on MicrosoftAjax. I can't believe I'm the only one trying this scenario. Who updates a whole form ? That is there left, the menu ?
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