Validating user input on the server side in a Typescript and .NET Core application

I am working on a .NET Core app with Angular and I need to implement server-side validation using TypeScript.

Specifically, I have a button on the screen that should only trigger an action if certain fields have valid values. These values need to be checked against data in the database, so a server-side action is required.

Although I am not performing POST/PUT actions on button click, I do require mandatory field validation before triggering any action. Once the mandatory fields are filled in with valid values, clicking the button should open a pop-up window. In between these TypeScript actions, a server-side action needs to be performed.

What would be the most effective approach to achieve this functionality?

Answer №1

When it comes to server-side validation, there are numerous methods that can be utilized.

An article provides an overview of server-side validation in an Angular 2 app with Rails, but a similar approach can also be applied to a .NET core application.

In essence, you must incorporate an error handler in your POST/PUT requests to the server that detects error codes such as 422, and then appropriately handles field errors on the client side. The server-side code must validate the submitted values (which may involve database queries) and is responsible for setting the appropriate error code (e.g. 422) in the response sent back to the client.

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