client/src/app/shared/forms/form-reactive.ts


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import { FormGroup } from '@angular/forms';

export abstract class FormReactive {
  abstract form: FormGroup;
  abstract formErrors: Object;
  abstract validationMessages: Object;

  abstract buildForm(): void;

  protected onValueChanged(data?: any) {
    for (const field in this.formErrors) {
      // clear previous error message (if any)
      this.formErrors[field] = '';
      const control = this.form.get(field);

      if (control && control.dirty && !control.valid) {
        const messages = this.validationMessages[field];
        for (const key in control.errors) {
          this.formErrors[field] += messages[key] + ' ';
        }
      }
    }
  }
}