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Blazor custom validation class attributes (#19909)

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Luke Latham 2020-09-17 07:58:36 -05:00 committed by GitHub
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aspnetcore/blazor/forms-validation.md
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@ -5,7 +5,7 @@ description: Learn how to use forms and field validation scenarios in Blazor.
monikerRange: '>= aspnetcore-3.1'
ms.author: riande
ms.custom: mvc
ms.date: 08/18/2020
ms.date: 09/17/2020
no-loc: ["ASP.NET Core Identity", cookie, Cookie, Blazor, "Blazor Server", "Blazor WebAssembly", "Identity", "Let's Encrypt", Razor, SignalR]
uid: blazor/forms-validation
---
@ -1015,6 +1015,32 @@ private class CustomValidator : ValidationAttribute
> [!NOTE]
> <xref:System.ComponentModel.DataAnnotations.ValidationContext.GetService%2A?displayProperty=nameWithType> is `null`. Injecting services for validation in the `IsValid` method isn't supported.
::: moniker range=">= aspnetcore-5.0"
## Custom validation class attributes
Custom validation class names are useful when integrating with CSS frameworks, such as [Bootstrap](https://getbootstrap.com/). To specify custom validation class names, create a class derived from `FieldCssClassProvider` and set the class on the <xref:Microsoft.AspNetCore.Components.Forms.EditContext> instance:
```csharp
var editContext = new EditContext(model);
editContext.SetFieldCssClassProvider(new MyFieldClassProvider());
...
private class MyFieldClassProvider : FieldCssClassProvider
{
public override string GetFieldCssClass(EditContext editContext,
in FieldIdentifier fieldIdentifier)
{
var isValid = !editContext.GetValidationMessages(fieldIdentifier).Any();
return isValid ? "good field" : "bad field";
}
}
```
::: moniker-end
### Blazor data annotations validation package
The [`Microsoft.AspNetCore.Components.DataAnnotations.Validation`](https://www.nuget.org/packages/Microsoft.AspNetCore.Components.DataAnnotations.Validation) is a package that fills validation experience gaps using the <xref:Microsoft.AspNetCore.Components.Forms.DataAnnotationsValidator> component. The package is currently *experimental*.