Styling validation messages

In this recipe, we explore the styling of form validation in Blazor. You’ve probably noticed in previous recipes that Blazor automatically applies validation classes to form fields during validation. Default validation CSS classes align with default Bootstrap styles, where invalid fields get a red accent and valid ones get a green accent. While the default settings increase the delivery velocity, in most cases, you will still have to customize the visual feedback to suit your application branding or functional requirements. Fortunately, Blazor allows customizing styling and classes appended to fields upon validation. This customization maintains the integrity of your application’s modular and loosely coupled architecture, ensuring that enhancements do not compromise the maintainability of your code.

Let’s implement a custom validation class provider, making Blazor mark missing labels in red while missing location capacity in yellow...