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Asked: 2026-05-27T08:33:14+00:00

Have an ASP.NET MVC3 app with model validation using FluentValidation . User enters some

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Have an ASP.NET MVC3 app with model validation using FluentValidation. User enters some html in a regular text field, and is presented with a user-friendly error on submit (because of the “A potentially dangerous Request.Form value” error).

What I’d really like to do is show a validation message right on the form itself (“Oops, no html allowed”) which shows up right next to the field – similar to model validation errors. That way, the user (malicious or not), knows about it before the entire form is actually filled out and submitted.

Would appreciate any ideas on how to go about implementing this apart from what’s shown here (i.e. without having to add [AllowHtml] + a regex to almost every field in almost every viewmodel)

Thanks!

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1 Answer

  1. Editorial Team

    You will need to write a custom ProertyValidator for server-side FluentValidation with client-side support. I think you can follow this article, here, to create client-side jquery validation rule and the adapter.

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