Validierung Part II, neue Komponenten

bizmatch/src/app/components/validation-messages.service.ts

@@ -0,0 +1,31 @@
+import { Injectable, InjectionToken } from '@angular/core';
+import { BehaviorSubject, Observable } from 'rxjs';
+
+export interface ValidationMessage {
+  field: string;
+  message: string;
+}
+
+export const VALIDATION_MESSAGES = new InjectionToken<ValidationMessagesService>('VALIDATION_MESSAGES');
+
+@Injectable({
+  providedIn: 'root',
+})
+export class ValidationMessagesService {
+  private messagesSubject = new BehaviorSubject<ValidationMessage[]>([]);
+  messages$: Observable<ValidationMessage[]> = this.messagesSubject.asObservable();
+
+  updateMessages(messages: ValidationMessage[]): void {
+    this.messagesSubject.next(messages);
+  }
+
+  clearMessages(): void {
+    this.messagesSubject.next([]);
+  }
+
+  getMessage(field: string): string | null {
+    const messages = this.messagesSubject.value;
+    const message = messages.find(m => m.field === field);
+    return message ? message.message : null;
+  }
+}