Comments on: Preventing specific items from being selected in a Flex Tree control

By: sun

sun — Fri, 10 Dec 2010 03:11:48 +0000

If i don’t want the tree change its selecteditem when i key in any of the key, is it possible?

By: Anonymous

Anonymous — Fri, 12 Feb 2010 01:23:41 +0000

@harley
type: (event.currentTarget as Tree).
bingo – auto complete

By: Peter deHaan

Peter deHaan — Fri, 20 Nov 2009 02:55:13 +0000

@Nicolas,

I’m sure there is a better way, but here’s kind of a brute force method of keeping certain nodes open:

"1.0" encoding="utf-8"?>
 xmlns:mx="http://www.adobe.com/2006/mxml">
 
    
        
            import mx.events.ListEvent;
            import mx.events.TreeEvent;
 
            protected var lastScrollPos:uint;
 
            protected function tr_itemCloseHandler(evt:TreeEvent):void {
                if (evt.item.@lockOpen == true) {
                    var it:Object = tr.openItems;
                    it.push(evt.item);
                    tr.openItems = it;
                    // scroll back to locked item
                    callLater(correctScrollPos);
                }
            }
 
            protected function correctScrollPos():void {
                tr.verticalScrollPosition = lastScrollPos;
            }
 
            protected function tr_itemRollOverHandler(evt:ListEvent):void  {
                lastScrollPos = tr.verticalScrollPosition;
            }
        ]]>
    
 
     id="dp" xmlns="">
        "root">
            "One" />
            "Two" />
            "Three" lockOpen="false">
                "Three.1" />
                "Three.2" />
                "Three.3" />
            >
            "Four" />
            "Five" />
            "Six *" lockOpen="true">
                "Six.1" />
                "Six.2" />
            >
            "Seven" />
            "Eight *" lockOpen="true">
                "Eight.1" />
                "Eight.2" />
            >
            "Nine">
                "Nine.1" />
                "Nine.2" />
            >
        >
    >
 
     id="tr"
             dataProvider="{dp}"
             labelField="@label"
             openDuration="0"
             width="200"
             itemRollOver="tr_itemRollOverHandler(event);"
             itemClose="tr_itemCloseHandler(event);" />
 
>

Peter

By: Nicolas

Nicolas — Thu, 19 Nov 2009 23:08:12 +0000

Is it possible to lock a Tree component in it’s open or closed position?

By: Heke

Heke — Fri, 17 Jul 2009 12:14:57 +0000

okay, I give up, can’t use this posting with tags:
mx:Tree id=”myTree”

By: Heke

Heke — Fri, 17 Jul 2009 12:13:44 +0000

okay, sorry.. seem it deleted part of code:

Application.application.myTree.selectedItem

By: Heke

Heke — Fri, 17 Jul 2009 12:11:13 +0000

I’m not sure if I understood your problem, but can’t you just reference to your tree by the Tree’s ID? For example:

and reference to it by using for example:
Application.application.myTree.selectedItem

Also the Tree inherits Event called “change” which is dispatched as the selectedItem (or selectedIndex, don’t know what that is) changes. So you could call your function through that event rather than itemClick.

itemClick=”tree_itemClick(event)”
replaced by:
change=”tree_itemClick(event)”

By: harley

harley — Thu, 23 Apr 2009 19:26:34 +0000

it works well enough for me.
I do have a question. I am pretty dependent on FB’s auto “code completion” and the event.currentTarget.selectedItem just never would have occured to me since “selecedItem” doesn’t come up. is there away to create the var as a tree item?
something like: var mytreeitem:tree = new tree; I can’t figure out a simple way to do this.. thanks in advance.

By: Daniel

Daniel — Mon, 21 Apr 2008 12:34:54 +0000

It also doesn’t work if you mouse-down on the item and release outside. Then it still selects…

By: Hans

Hans — Thu, 17 Jan 2008 18:47:55 +0000

In this example, items can still be selected via keyboard up and down arrows. The example does correctly prevent navigating to parent and child nodes that are disabled via left and right arrows though.