I've always been under the impression that events are guaranteed to
be fired _at_least_ once, hence your event handler has to be
[idempotent](http://en.wikipedia.org/wiki/Idempotence_%
28computer_science%29). In particular, it may be that when you
register an event at init time, it is fired immediately (in case the
event you wanted has already happened).
If my impression is true, I hope it is documented. If not, I am at a
loss to explain the behaviour you are seeing.
On 2006-09-25, at 16:07 EDT, James Howe wrote:
> In my application I've set up a tree which looks roughly like this:
>
> <tree name="treeRoot" showroot="false" isleaf="false" datapath="ds:/">
> <tree isleaf="false" datapath="foo/bar">
> <tree datapath="*"/>
> </tree>
> <tree isleaf="false" datapath="baz/bar">
> <tree datapath="*"/>
> </tree>
> </tree>
>
> The dataset contains other elements which I don't want to be in the
> tree
> which is why I have the two subtrees setup to use a specific datapath
> instead of simply using "*". I want the root tree to do something
> when
> new data arrives. My assumption was that whenever I requested data
> from the dataset (ds) I would receive an ondata event at my root tree.
> I added a method to "treeRoot" which does this:
>
> <method event="ondata>
> Data.write("On data");
> </method>
>
> When I start my application, I immediately get the 'On data' message,
> even though I haven't requested any data from my dataset. However,
> when
> I actually do request data from the dataset, my ondata event
> doesn't get
> called. The tree, however, displays correctly. I'm sure I'm doing
> something stupid, but can anyone offer ideas on what I might be doing
> wrong?
>
> Thanks!
> --
> James Howe
>
>
>
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