I'm assuming that, since no one has answered this, that there isn't an
easy way to do it as written. Therefore, I'm looking into extending the
Tree2 component so its action takes another parameter:
toggleActionListener="#{myListener}"
Behind the scenes, if this parameter is specified, the tree component
would execute addAction() on the expandControl, thus allowing the
application developer the ability to intercept the expand or collapse
events and do other things, such as read the database for more data
beneath that node.
Does this sound like a reasonable approach, or is the equivalent
functionality already there, and I'm just missing it?
- Brendan
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When a use clicks the "expand" icon in a serverside Tree2 component, I
would like my application to go out and grab more data from the database
to fill in the details of that node's children. What's the hook in
Tree2 that I can use to do that? Should I override one of the methods?
Should I intercept some sort of action?
At first, I tried subclassing TreeNodeBase and overriding the
getChildren method so it calls a routine in my application to get more
data. However, this results in having all the data in the entire tree
retrieved after just clicking on the root, which is not what I want. I
want just the data for the immediate children retrieved from the
database when a parent node's "expand" icon is clicked.
Any usage help would be much appreciated!
- Brendan
