The Remote Attribute
Explore how to use the Remote Attribute in ASP.NET Core MVC to validate user inputs on the server side. Learn to implement validation endpoints that return JSON results, handle multiple fields, and provide instant feedback for inputs like unique identifiers and names. This lesson helps you create responsive, user-friendly forms with server-driven validation logic.
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There are situations when an input must be validated as soon as it is provided, but the information needed for the validation is available only on the server-side. A common example is the validation of unique identifiers chosen by the user, such as an email address, a username, or the subdomain name for a blog or any other personal set of pages.
It is important to furnish immediate feedback on the availability of the name so that the user can easily check several names till they find an available name they like. The verification requires a check on the server’s permanent storage.
The RemoteAttribute was conceived to face situations like the ones depicted above. While all other validation ...