Expand and Collapse all Tree Nodes
APEX comes with a nice region type which is a tree view. During the wizard creation, you have the option to add buttons to expand all and collapse all nodes - but after the fact, there is no option in the tree settings to add this functionality - so you either have to recreate the tree region specifying that option or have to know what you have to do in order to add in that functionality. I came across this post on the OTN forums - http://forums.oracle.com/forums/message.jspa?messageID=4407552#4407552 - which give all the information about what you have to do to expand and collapse all nodes (I'm sure there are others, but that just happened to be the one I found). This basic gist of it is this - there are two convenience functions to do the expanding and collapsing of all nodes - apex.widget.tree.expand_all(tree_id) and apex.widget.tree.collapse_all(tree_id), respectively - where tree_id is the unique identifier of the tree. You can either hard code it in (which is what is do...