Changes suggested by @lola27 has been made with https://github.com/freenas/webui/pull/105

src/app/components/common/dual-list/dual-list.component.ts

@@ -32,7 +32,6 @@ export class DualListboxComponent implements OnInit {
   }
 
   select() {
-    console.log('selected items called');
     const { from, to } = transfer(this.availableItems, this.selectedItems);
     this.availableItems = from;
     this.selectedItems = to;
@@ -40,7 +39,6 @@ export class DualListboxComponent implements OnInit {
   }
 
   return() {
-    console.log('return items called');
     const { from, to } = transfer(this.selectedItems, this.availableItems);
     this.selectedItems = from;
     this.availableItems = to;

src/app/components/common/dual-list/models.ts

@@ -31,6 +31,8 @@ export class ListSelectionImpl implements ListSelection {
   select(item: any): void {
     if (!this.isSelected(item)) {
       this._selectedItems.push(item);
+    } else {
+      this.unselect(item);
     }
   }
 

src/app/services/ws.service.ts

@@ -34,12 +34,14 @@ export class WebSocketService {
     this.socket = new WebSocket(
         (window.location.protocol == 'https:' ? 'wss://' : 'ws://') +
         environment.remote + '/websocket');
+    console.log(this.socket);
     this.socket.onmessage = this.onmessage.bind(this);
     this.socket.onopen = this.onopen.bind(this);
     this.socket.onclose = this.onclose.bind(this);
   }
 
   onopen(event) {
+    console.log('onpen event happened');
     this.onOpenSubject.next(true);
     this.send({"msg" : "connect", "version" : "1", "support" : [ "1" ]});
   }
@@ -117,6 +119,7 @@ export class WebSocketService {
   send(payload) {
     if (this.socket.readyState == WebSocket.OPEN) {
       this.socket.send(JSON.stringify(payload));
+      console.log('send payload', this.socket.readyState, payload);
     } else {
       this.pendingMessages.push(payload);
     }