add chat offline

src/app/services/chat/ws-chat-methods.service.ts

@@ -131,7 +131,7 @@ export class WsChatMethodsService {
   /**
    * @description sort room list by last message date
    */
-  sortRoomList() {
+  sortRoomList =() => {
     this._dm = this.sortService.sortDate(this._dm,'_updatedAt').reverse()
     this._group = this.sortService.sortDate(this._group,'_updatedAt').reverse()
   }
@@ -207,6 +207,7 @@ export class WsChatMethodsService {
     room.receiveMessage()
     room.getAllUsers = this.getUsers
     room.receiveMessageDelete();
+    room.sortRoomList = this.sortRoomList
 
     let roomId = this.getRoomId(roomData)