[Laszlo-user] Drag and drop refresh issue using dhtml

[Charles Watt]

I went back and tested with 4.2.0.2 and the dhtml works fine in the 
older version.  This appears to be a bug in the dhtml implementation of 
4.3.0.


Charles Watt wrote:
> After running into issues with the opttree component from the 
> incubator, I've extended the standard tree component to support drag 
> and drop to allow reordering of the tree.  I used the draglib library 
> with checkdragstate and basedragimage for the implementation.
> It works great in all versions of swf.  But with dhtml there is a 
> subtle bug -- and of course dhtml is technology in which we need to 
> deliver the code.  With dhtml, if tree items are moved to a different 
> branch of the tree, subsequent operations can be flakey.  The correct 
> item will be dragged, but occasionally the wrong target will be 
> selected for the drop.  After some investigation it looks as if the 
> tracker implementing the drop does not refresh its view of the tree 
> layout.  When it tries to drop onto the Nth clone, it selects the 
> original Nth clone rather than the current.  However the displayed 
> tree looks correct and I've manually walked both the hierarchy of 
> clones and nodes and they both look correct.  Only the tracker seems 
> confused.
>
> I tried fixing this by unregistering all drop targets and then 
> re-registering them after moving a tree item.  But the tracker still 
> has the same, original view of the tree.
> Any suggestions on what I missed or how I might get the tracker 
> synched up with the current layout of the tree?
>
> Thanks!
> Charlie Watt
> Racemi