From c0cecb0cf031959910202a3fe577167b4fb6e49f Mon Sep 17 00:00:00 2001
From: leejinho <lilis7575@gmail.com>
Date: Wed, 26 Feb 2020 12:51:02 +0900
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---
 .../app/pages/messenger/components/main.page.component.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/projects/ucap-webmessenger-app/src/app/pages/messenger/components/main.page.component.ts b/projects/ucap-webmessenger-app/src/app/pages/messenger/components/main.page.component.ts
index 15a69485..0d806824 100644
--- a/projects/ucap-webmessenger-app/src/app/pages/messenger/components/main.page.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/pages/messenger/components/main.page.component.ts
@@ -51,6 +51,7 @@ import { environment } from '../../../../environments/environment';
 import { TranslateService } from '@ngx-translate/core';
 import { LeftSideComponent } from '@app/layouts/messenger/components/left-side.component';
 import { MatDrawer } from '@angular/material/sidenav';
+import { LocationStrategy } from '@angular/common';
 
 @Component({
   selector: 'app-page-messenger-main',
@@ -100,11 +101,18 @@ export class MainPageComponent implements OnInit, OnDestroy {
     private sessionStorageService: SessionStorageService,
     private translateService: TranslateService,
     private dialogService: DialogService,
+    private location: LocationStrategy,
     private logger: NGXLogger
   ) {
     this.environmentsInfo = this.sessionStorageService.get<EnvironmentsInfo>(
       KEY_ENVIRONMENTS_INFO
     );
+
+    // preventing back button in browser
+    history.pushState(null, null, window.location.href);
+    this.location.onPopState(() => {
+      history.pushState(null, null, window.location.href);
+    });
   }
 
   ngOnInit(): void {