![]() ![]() Using the login example from above, your controller action for handling the user logging in could simply be: public ActionResult Login(string email, string password) If you create the markup yourself you can get away without having to create a model for your view. If you want to validate a text field using a regular expression for 5 to 8 digits, it would look like this: ![]() The way these work is very similar, they just need additional data-val- for their parameters. Some validation methods have parameters, for example RegularExpression. The only consequence of an error is that the span’s class is changed from field-validation-valid to field-validation-error (this happens irrespectively of the value of data-valmsg-replace="false"). If data-valmsg-replace="false" then the original message will never be replaced. This message would then be replaced by any validation error that occurs in the email field, for example “The email is required”. The data-valmsg-for‘s value is the name (not the id) of the input it refers to, and data-valmsg-replace="true" just means that the default message should be replaced, for example you could have a default message for the email field: The email must be unique This works because the MVC’s “unobtrusive validation” works by looking for inputs that are annotated with data-val attributes. data-val-required="This is the error message"). data-val-required), the value of which will be the error message presented to the user (e.g. It turns out that to enable client side validation without using the HtmlHelpers and a model you just have to add an input with data-val="true" and then data-val- followed by validation method that you want to apply (e.g. If you inspect the markup that the helpers generate you’ll see that it’s actually pretty simple: It is possible to take advantage of client side validation without having to create a model class and annotate it, which can be useful if you only use a couple of parameters (such as in the Login example). The last two requirements are actually optional. Getting away with using Client Side validation without a model The next requirement is that you use attributes from in the Model class that is used in view where you want client-side validation enabled.įor example, if we want the Email field to be a valid email, and make the password and email fields required we would create a model like this: using įinally, we have to use the HtmlHelpers that generate the correct markup for all of this to work, and they have to be inside a form, for example => => => => => => m.Password) ![]() HtmlHelper.ClientValidationEnabled = false For example this would turn off client side validation if executed inside a controller’s action: public ActionResult Index() These settings can be overridden in a controller, make sure that is not happening. Make sure your web.config has the following keys in appSettings with the follwoing values: In this blog post I’ll show you how you can take advantage of this.ĪSP.NET MVC Client Side validation requirementsįirst, here’s the list of things you need to do to enable client-side validation in an ASP.NET MVC project Make sure your client side code is loading both: ![]() Despite this, the underlying implementation is fully based on jQuery’s. It can be said that MVC’s client-side validation is an opinionated version of how jQuery validation should work in an ASP.NET MVC project. It is also possible to use resources in the error message for globalized MVC client side validation is based on the jQuery validation plugin. Data annotations for Database first implementation (model code auto-generated)įirst add the namespace: using Īnd apply the attribute on a property.Basic validation attributes used in ViewModel.Automatic client-side validation from attributes. ![]()
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