feat: add error handling to CashboxExportDialog

myteamwallet_frontend_modern/src/app/features/team/cashbox/cashbox-export-dialog/cashbox-export-dialog.spec.ts

@@ -1,6 +1,6 @@
 import { ComponentFixture, TestBed } from '@angular/core/testing';
 import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';
-import { of } from 'rxjs';
+import { of, throwError } from 'rxjs';
 import { CashboxExportApi } from '../../../../core/team/cashbox-export-api';
 import { FileDownloadService } from '../../../../shared/file-download/file-download.service';
 import { CashboxExportDialog } from './cashbox-export-dialog';
@@ -46,4 +46,26 @@ describe('CashboxExportDialog', () => {
     expect(save).toHaveBeenCalledWith(expect.any(Blob), 'kassenbuch_2026-08-01_2026-08-31.csv');
     expect(dialogRef.close).toHaveBeenCalled();
   });
+
+  it('displays error message and does not close dialog on export failure', () => {
+    exportCashbox = vi.fn(() => throwError(() => new Error('network error')));
+    TestBed.resetTestingModule();
+    TestBed.configureTestingModule({
+      imports: [CashboxExportDialog],
+      providers: [
+        { provide: MAT_DIALOG_DATA, useValue: { teamId: 5 } },
+        { provide: MatDialogRef, useValue: dialogRef },
+        { provide: CashboxExportApi, useValue: { exportCashbox } },
+        { provide: FileDownloadService, useValue: { save } },
+      ],
+    });
+    fixture = TestBed.createComponent(CashboxExportDialog);
+    fixture.detectChanges();
+
+    fixture.componentInstance['form'].setValue({ from: '2026-08-01', to: '2026-08-31', format: 'csv' });
+    fixture.componentInstance['download']();
+
+    expect(dialogRef.close).not.toHaveBeenCalled();
+    expect(fixture.componentInstance['downloadError']()).toBe('Export konnte nicht heruntergeladen werden.');
+  });
 });

myteamwallet_frontend_modern/src/app/features/team/cashbox/cashbox-export-dialog/cashbox-export-dialog.ts

@@ -1,4 +1,4 @@
-import { Component, inject } from '@angular/core';
+import { Component, inject, signal } from '@angular/core';
 import { FormBuilder, ReactiveFormsModule, ValidationErrors, ValidatorFn, Validators } from '@angular/forms';
 import { MatButtonModule } from '@angular/material/button';
 import { MAT_DIALOG_DATA, MatDialogModule, MatDialogRef } from '@angular/material/dialog';
@@ -29,6 +29,9 @@ const rangeValid: ValidatorFn = (group): ValidationErrors | null => {
     <h2 mat-dialog-title>Kassenbuch exportieren</h2>
     <form [formGroup]="form" (ngSubmit)="download()">
       <mat-dialog-content>
+        @if (downloadError()) {
+          <p class="error">{{ downloadError() }}</p>
+        }
         <mat-form-field appearance="outline">
           <mat-label>Von</mat-label>
           <input matInput formControlName="from" type="date" />
@@ -59,6 +62,8 @@ export class CashboxExportDialog {
   private readonly api = inject(CashboxExportApi);
   private readonly fileDownload = inject(FileDownloadService);
 
+  protected readonly downloadError = signal<string | null>(null);
+
   protected readonly form = this.formBuilder.nonNullable.group(
     {
       from: ['', Validators.required],
@@ -70,10 +75,16 @@ export class CashboxExportDialog {
 
   protected download(): void {
     if (this.form.invalid) return;
+    this.downloadError.set(null);
     const { from, to, format } = this.form.getRawValue();
-    this.api.exportCashbox(this.data.teamId, from, to, format).subscribe((blob) => {
+    this.api.exportCashbox(this.data.teamId, from, to, format).subscribe({
+      next: (blob) => {
         this.fileDownload.save(blob, `kassenbuch_${from}_${to}.${format}`);
         this.dialogRef.close();
+      },
+      error: () => {
+        this.downloadError.set('Export konnte nicht heruntergeladen werden.');
+      },
     });
   }
 }