Skip to main content

ASP.NET MVC 3: ViewContext.FormContext

ASP.NET MVC 3 introduced the concept of unobtrusive client validation. Based on data annotations on top of your model,  the HTML helpers render markup with validation info using the HTML5 data attribute:
<input data-val="true" 
data-val-required="The ProductName field is required."
id="ProductName" name="ProductName" type="text" />

These data attributes are picked up by the jquery.validate.unobtrusive library that constructs the correct validation rules for jquery.validate.

ViewContext.FormContext
In our project, we load some parts of the user interface dynamically based on some user actions. We noticed that the MVC framework didn’t render the data attributes in that case.


What’s the reason? We found out attributes with validation rules are rendered only if the ViewContext.FormContext property is initialized. It could be done with Html.BeginForm() method called in the beginning but, as in our case there was already a form on the page, so we set the FormContext manually:


if (ViewContext != null && ViewContext.FormContext == null)
{
 var dummyFormContext = new FormContext();
 ViewContext.FormContext = dummyFormContext;
}

Popular posts from this blog

.NET 8–Keyed/Named Services

A feature that a lot of IoC container libraries support but that was missing in the default DI container provided by Microsoft is the support for Keyed or Named Services. This feature allows you to register the same type multiple times using different names, allowing you to resolve a specific instance based on the circumstances. Although there is some controversy if supporting this feature is a good idea or not, it certainly can be handy. To support this feature a new interface IKeyedServiceProvider got introduced in .NET 8 providing 2 new methods on our ServiceProvider instance: object? GetKeyedService(Type serviceType, object? serviceKey); object GetRequiredKeyedService(Type serviceType, object? serviceKey); To use it, we need to register our service using one of the new extension methods: Resolving the service can be done either through the FromKeyedServices attribute: or by injecting the IKeyedServiceProvider interface and calling the GetRequiredKeyedServic...

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.

Kubernetes–Limit your environmental impact

Reducing the carbon footprint and CO2 emission of our (cloud) workloads, is a responsibility of all of us. If you are running a Kubernetes cluster, have a look at Kube-Green . kube-green is a simple Kubernetes operator that automatically shuts down (some of) your pods when you don't need them. A single pod produces about 11 Kg CO2eq per year( here the calculation). Reason enough to give it a try! Installing kube-green in your cluster The easiest way to install the operator in your cluster is through kubectl. We first need to install a cert-manager: kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.5/cert-manager.yaml Remark: Wait a minute before you continue as it can take some time before the cert-manager is up & running inside your cluster. Now we can install the kube-green operator: kubectl apply -f https://github.com/kube-green/kube-green/releases/latest/download/kube-green.yaml Now in the namespace where we want t...