[flexcoders] Detect if Object exists

Thu, 20 Jul 2006 17:39:04 -0700

I've got a datagrid with a list of people, that when you double click on one, it creates a new tab with that person's data into a TabNavigator. I'm trying to get it so it will only open one instance of a tab for each person, and if you try to open a person again, it will simply select their tab that already exists. Sounds pretty straightforward, right?

Here's what I've got, when you click the button for their data or double click their name, an event is launched which then calls this function, createTab:

private function createTab(createTabName:String):void
            {
                var newVbox:VBox = new VBox();
                var newHbox:HBox = new HBox();
                var newTab:Canvas = new Canvas();
                var newSpacer:Spacer = new Spacer();
                var tabCloseBtn:Button = new Button();
               
                // create button to close tab
                tabCloseBtn.label = "Close Tab";
                tabCloseBtn.addEventListener (MouseEvent.CLICK, myClickListener);   
               
                // create spacer to position close button           
                newSpacer.percentWidth = 100;
               
                // create box layout controls
                newHbox.percentWidth = 100;
                newHbox.addChild(newSpacer);
                newHbox.addChild(tabCloseBtn);
                newVbox.addChild(newHbox);
                newVbox.addChild (getTithesComponent(this.masterList.selectedItem.ContribNum));
               
                // create tab
                newTab.label = createTabName;
                newTab.id = 'userTab' + this.masterList.selectedItem.ContribNum ;
                newTab.addChild(newVbox);
               
                var selectTab:ObjectName = newTab.id;
                   
                if (!selectTab) {
                    this.windowTabs.selectedChild = selectTab;
                } else {
                    this.windowTabs.addChild(newTab);
                    this.windowTabs.selectedChild = newTab;
                }
               
            }

Now from the docs I've found, it seems like doing an if statement with the condition of ! objectID should be checking if that id exists, right? for some reason it always returns false, even when a new canvas in the TabNavigator stack with that id value already exists.

Any ideas how I can accurately detect if the object exists?
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