I am looking to create a custom validator for reactive forms. I plan on implementing it like this:
export class CustomValidators {
isMemberOf(allowedValues: any[]) {
return (ctrl: AbstractControl) => {
//whatever
};
}
}
How can I define this method so that it becomes a part of the existing Validators class provided by the forms module? This way, it can be accessed using Validators.isMemberOf(...) similar to how we use Validators.required.
Take a look at module augmentation as it may suit your requirements
import { CustomValidators } from "your-package";
declare module "your-module" {
interface CustomValidators {
isPartOf(valuesToCheck: any[]): any;
}
}
CustomValidators.prototype.isPartOf = (valuesToCheck: any[]) => {...}
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