Re: Re: [flexcoders] Re: How to refresh a tree

[Marcel Fahle]

Hey Guys, my problem was, that the tree was reacting weird when scrolling around after adding data to its dataprovider (XMLListCollection) using setChildren. (When the user clicks a branch node, it's childnodes should be loaded from my streamingserver (=returns XML)) I found out, that the problem was, that the tree wasn't "prepared" for the "arrival" of new childnodes.. The nodes (branchNodes) where I wanted to add children later gave me the return valueof false on asking hasChildren() And there lies the problem: The tree doesn't expect new children and reacts a little bit weird (which maybe belongs to the uncorrect use of measure, as you said, Mike). Anyway, I solved my problem like this: When first generating my DataProvider I added on each empty branch node a single node with just the label "loading...", what makes the datadescriptor return true on hasChildren. When the subenodes are loaded, I just delete the "loading..." node, as you can see on these screenshots: http://marcelfahle.com/labs/flex2/screens/cptreeproblem1.jpg http://marcelfahle.com/labs/flex2/screens/cptreeproblem2.jpg http://marcelfahle.com/labs/flex2/screens/cptreeproblem3.jpg Using this "hack" everything works good for me.. If anybody wants to see it in action, just drop me a line off-list.. Michael Schmalle wrote: Hi, There is some issues with the Tree and XML dtat provider collections. One thing I can suggest is; Add an event listener to the divider bar release, I can't remeber what it is, in that handler call myTree.invalidateList(); Give it a try and let me know. I have the same issues with using itemRenderers and changing some internal data specific things. After I am done with my process, I called invalidateList() and it did a nice redraw quickly. There probably is just an update isse and measure() is not being called correctly. Peace, Mike On 8/23/06, e baggg < [EMAIL PROTECTED]com> wrote: I too have had problems with XML nodes in tree. One thing that eliminated a lot of the issues was reassigning the dataProvider of the tree explictly (right after you update the node. so... [Bindable] private var xmlN : XML .... private function updateTreeDataProvider : void {  //code that updates xmlN    treeNav.dataProvider= xmlN; } <mx:Tree id="treeNav" Marcel Fahle <[EMAIL PROTECTED]com> wrote: Hi Dave, did you found a solution on that? I've got a similar problem here. Marcel Dave Bobby wrote: This is flaky, might be a bug. root -a --aa --ab --ac -b -c --ca --cb --cc say the last server retrieval got ca, cb and cc. but the tree did not show a scrollbar. this tree is in a vDivided box, so when i move the divider upto b, i see a scrollbar, but when i move divider to cb or cc, ca-cb and cc disappear and no scrollbar. bug? or am i doing something wrong? i think that the tree should be refreshing when i do such operations. thanks. --- In [EMAIL PROTECTED]ups.com, "Dave Bobby" <[EMAIL PROTECTED]> wrote: > > I am trying to append data retrieved to selectedItems in the tree > represented by an XMLListCollection. During the trace I see that the > retrieived items have been added to the XMLListCollection correctly > and this collection in Bindable. > > But the tree itself behaves wierd. Sometimes it shows the scrollbars, > sometimes not. Sometimes, when I scroll up and down, it collates > different nodes to different parents visually. > > Any ideas? > > Thanks. > > Dave. > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- What goes up, does come down. __._,_.___ -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com SPONSORED LINKS Web site design development Computer software development Software design and development Macromedia flex Software development best practice YAHOO! GROUPS LINKS  Visit your group "flexcoders" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. __,_._,___