If your selection is based on an object id it seems to me that you
could have in each item:
oninit="this.setAttribute('selected', selectedID === this.ID)";
thus each time items ar refreshed, they will set themselves to
selected or not, as appropriate. Each item worries about itself,
rather than trying to have a global handler that worries about all
the items.
On 9 Feb 2006, at 22:44, James Howe wrote:
The main reason I want to know is that it seems that if replication
isn't done, I'm not able to select a particular item. For example,
my grid displays a list of items. A user can select one row which
display some other information related to that item. Periodically
the grid may refresh itself from the server. I don't want the
selection to change just because the data refreshed. I want to
reselect the same item as before. I'm using an ID associated with
the row so even if the position of the object changes, I can still
find it. To date, I have been unable to get anything but a
selectItemAt(0) to work, and even that only works part of the
time. I assumed it had something to do with the replication, but
perhaps that's not the problem.
Of course, this raises an interesting question. Suppose the user
has selected the 500th object in the list. The grid is using lazy
replication. When the grid refreshes I want to reselect the same
object (from a logical perspective). Perhaps the object is now at
position 480. With lazy replication, will I be able to find out
that the object i'm interested in is at position 480? Right now
I'm using an xpath query to find a data node and then telling the
grid to select based on that data. Of course, as I mention above,
that doesn't work, even for a small number of items in a grid.
Any thoughts on how to make this work, with or without determining
when replication has completed, would be appreciated.
Thanks.
On Thu, 09 Feb 2006 17:59:31 -0500, P T Withington
<[EMAIL PROTECTED]> wrote:
I'd be interested to know why you need to know when replication is
done. I'd like to see an easy way to do this that did not involve
counting clones and adding delegates, but every time I've thought
I really needed to know when replication was done, it turned out
there was a different way of looking at my problem that did not
require it. For instance, it is usually sufficient to add a
handler for oninit in the replicated nodes.
On 9 Feb 2006, at 17:39, James Howe wrote:
I've been trying to figure out how to know when data replication
has finished with a grid. I've looked at the examples which use
List or other components, but Grids seem to work differently. I
think it has to do with the fact that grids have both a datapath
and a contentdatapath, and it's the contentdatapath which
triggers replication. In most examples I've seen for dealing
with data replication I'll see something like this:
<class name="repltabelt" extends="tabelement" text="$path
{'@name'}" visible="true"/>
<tabslider width="150" name="gs" height="150" spacing="2">
<repltabelt name="pane">
<datapath>
<method event="onclones">
if (!this['doneDel']) {
this.doneDel = new LzDelegate(this, 'openOH')
this.doneDel.register(clones[clones.length - 1],
'oninit')
}
</method>
...
</datapath>
...
In this example, if I'm interpreting it correctly, the datapath
associated with the 'repltabelt' will trigger clones and the code
can hook into this by adding a method to the datapath (via
<datapath>) to catch and do something with this information. A
grid is more like:
<grid datapath="..." contentdatapath="...">
<gridcolumn datapath="..."/>
<gridcolumn datapath="..."/>
</grid>
The replication is on contentdatapath. How do I define a method
to handle the onclones event in this situation? It seems like
things would be clearer if grids were defined like this:
<grid datapath="...">
<gridrow datapath="...">
<gridcolumn .../>
<gridcolumn .../>
</gridrow>
</grid>
where the datapath for the gridrow was what is currently known as
contentdatapath in grid. Then you could use the <datapath>
syntax on <gridrow> to define the onclones handling method.
Anyway, does anyone know how to deal with 'onclones' with respect
to the contentdatapath in a grid?
Thanks.
--James Howe
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James Howe
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