1 files changed, 42 insertions, 0 deletions
diff --git a/src/app/guards/pending-changes.guard.ts b/src/app/guards/pending-changes.guard.ts
new file mode 100644
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+++ b/src/app/guards/pending-changes.guard.ts
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { CanDeactivate } from '@angular/router';
+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs';
+import { TranslateService } from '@ngx-translate/core';
+
+export interface ComponentCanDeactivate {
+  canDeactivate: () => boolean;
+}
+
+@Injectable()
+export class PendingChangesGuard implements CanDeactivate<ComponentCanDeactivate> {
+  constructor(public translateService: TranslateService) {}
+
+  canDeactivate(component: ComponentCanDeactivate): boolean | Observable<boolean> {
+    // if there are no pending changes, just allow deactivation; else confirm first
+    return component.canDeactivate()
+      ? true
+      : // NOTE: this warning message will only be shown when navigating elsewhere within your angular app;
+        // when navigating away from your angular app, the browser will show a generic warning message
+        // see http://stackoverflow.com/a/42207299/7307355
+        confirm(this.translateService.instant('serviceModels.warningMessage.warning'));
+  }
+}