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Building Blazor Server-Side Rendering (SSR) forms used to mean waiting.
A user fills out a form. They hit submit. The form goes to the server. The server checks the data. Only then does the user see an error message. This delay breaks the user experience.
DotNet 11 Preview 5 changes this.
Blazor SSR forms now have instant client-side validation. You no longer need a server round-trip just to show a red border or an error message.
How it works:
โข The server sends validation rules as HTML metadata. โข Blazor JavaScript reads these rules in the browser. โข The browser enforces the rules instantly. โข The server still re-validates everything on submission for security.
You do not need to change your code. If you use the DataAnnotationsValidator component, it works automatically.
Why this matters:
Before this update, developers using SSR had to choose between slow validation or adding extra JavaScript libraries. Now, you get the speed of a client-side app with the simplicity of SSR.
New features in Preview 5:
- Instant feedback: Errors show up the moment a user leaves a field.
- Async validation: New tools allow you to check things like username availability without blocking the UI.
- First-class localization: You can now manage multi-language error messages easily through the framework.
This update closes the gap between SSR and interactive Blazor modes. It makes SSR a top choice for form-heavy applications and public websites.
Are you using Blazor SSR for your production apps? Does instant validation change how you plan your next project?