Are you using GWT-RPC? I'm not sure I understand your problem completely.
So if I have a service like:
public interface MyService extends RemoteService {
public Entity fetchEntity(String id);
}
public interface MyServiceAsync {
void fetchEntity(String id, AsyncCallback<Entity> callback);
}
then, in the GWT code, something triggers the service. Typically it is via
a button click or some event. You seem to indicate that you are doing it by
passing the id as a URL parameter, like:
http://host/my.gwt.application/Application.html?id=123
You should be able to parse the URL using the Window.Location.getPath() to
get the url param with a regex.
Once you have that, you do this:
MyServiceAsync service = GWT.create(MyService.class);
service.fetchEntity(id, new AsyncCallback<Void>() {
onFailure(Throwable t) {
Window.alert("service call failed: "+t.getMessage());
}
onSuccess(Entity e) {
// do something with the entity
}
});
After onSuccess( ) -- you populate the form with whatever.
On Mon, Nov 16, 2009 at 5:02 PM, David C. Hicks <[email protected]> wrote:
> I'm sure I must be making this harder than it needs to be, but I'm
> having zero success doing it.
>
> Entering a new form, I'd like to display the name of an entity that was
> selected on the the calling page. The calling page is a Struts2 JSP, so
> I don't have the entire entity. I only have the entity's ID, passed in
> as a parameter on the request URL. That's easy enough to get, and I
> even have a service set up to go get the full entity once I have the
> ID. The problem is that the service is asyncronous. So, I get a Null
> Pointer Exception at the point where I try to set the data I'm
> retrieving into a label because the call hasn't yet completed.
>
> I'd rather not pass the name on the request URL - trying to avoid the
> messy encoding/decoding problems. I've tried to create an AsyncCallback
> class that included a hook that I could "wait" for, but this only seemed
> to create an infinite wait loop.
>
> So, now I'm wondering if I need to somehow "bind" the retrieved data to
> a field on my form so that it will populate when the call completes.
> Then again, maybe this is overkill, too.
>
> Is there a better way to solve this problem?
> Thanks,
> Dave
>
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