Using decorators to validate in Angular 2 with TypeScript

Question

I am working on a project in which I am using Angular 2 and NodeJS with TypeScript.

Angular2 uses decorators to define Components. I would like to be able to express the validation logic on domain objects in the same way. This would be useful because I could express the validation rule 1 time and use it both on the server side and on the client side.

Instead of expressing the required field in the markup as follows:

<input required [(ng-model)]="selectedHero.name"></input>

I would like to do this:

class Hero {
    id: number;

    @Required
    name: string;
}

I am trying to figure out how to write a directive to read metadata to apply the required attribute to an input element, and also in NodeJS to generate validation errors. Any recommendations are appreciated. Thank you for your help.

Answer 1

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