Hmmm, interesting... Wicket components are by default created with the
idea that the model is managed at the server side.
The best solution is probably to combine this with roundtrips; so each
time you push a button, it would remove from one and add to the other
side. Combined with ajax, that might be a pretty robust solution.
Another solution might be to have 'auto growing' lists, that try to
synchronize their models with what comes in.
Could you please send us some code fragments (especially the client side
ones)?
Johan, have you made such a component yet?
Eelco
Kruger Jan Petter wrote:
I’m trying to implement a page with two selection lists. The purpose
is to have a control where one can move selected choices between the
two lists.
With a little javascript the movement of items between the lists is
easy, but the problem arises when the form embedding the lists is
submitted. If the
Content in the lists are changed, wicket gives me a runtime exception.
I guess this has something to do with the change in number of elements
in the lists, and
some checks against the model. I have used a ListMulitpleChoice
control like
new
ListMultipleChoice("availableDomainRoles",userWeb.getAvailableDomainRoles());
I could create a class that extends ListMultipleChoice. Are there any
samples doing this, or are there another approach to this that I have
missed ?
[2005-06-16 14:20:20,510] ERROR [PoolThread-49]
RequestCycle.onRuntimeException(561) | Unexpected runtime exception
[page = null]
_wicket.WicketRuntimeException_: Method public abstract void
wicket.markup.html.form.IFormSubmitListener.onFormSubmitted() of
interface IFormSubmitListener threw an exception
at
wicket.protocol.http.WebRequestCycle.invokeInterface(_WebRequestCycle.java:348_)
at
wicket.protocol.http.WebRequestCycle.invokeInterface(_WebRequestCycle.java:387_)
at
wicket.protocol.http.WebRequestCycle.callComponentListener(_WebRequestCycle.java:284_)
at
wicket.protocol.http.WebRequestCycle.parseRequest(_WebRequestCycle.java:122_)
at wicket.RequestCycle.request(_RequestCycle.java:372_)
at wicket.protocol.http.WicketServlet.doGet(_WicketServlet.java:221_)
at wicket.protocol.http.WicketServlet.doPost(_WicketServlet.java:245_)
at javax.servlet.http.HttpServlet.service(_HttpServlet.java:760_)
at javax.servlet.http.HttpServlet.service(_HttpServlet.java:853_)
at
org.mortbay.jetty.servlet.ServletHolder.handle(_ServletHolder.java:358_)
at
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(_WebApplicationHandler.java:294_)
at
org.mortbay.jetty.servlet.ServletHandler.handle(_ServletHandler.java:567_)
at org.mortbay.http.HttpContext.handle(_HttpContext.java:1807_)
at
org.mortbay.jetty.servlet.WebApplicationContext.handle(_WebApplicationContext.java:525_)
at org.mortbay.http.HttpContext.handle(_HttpContext.java:1757_)
at org.mortbay.http.HttpServer.service(_HttpServer.java:879_)
at org.mortbay.http.HttpConnection.service(_HttpConnection.java:790_)
at org.mortbay.http.HttpConnection.handleNext(_HttpConnection.java:961_)
at org.mortbay.http.HttpConnection.handle(_HttpConnection.java:807_)
at
org.mortbay.http.SocketListener.handleConnection(_SocketListener.java:218_)
at org.mortbay.util.ThreadedServer.handle(_ThreadedServer.java:300_)
at org.mortbay.util.ThreadPool$PoolThread.run(_ThreadPool.java:511_)
Caused by: _java.lang.reflect.InvocationTargetException_
at sun.reflect.NativeMethodAccessorImpl.invoke0(_Native Method_)
at
sun.reflect.NativeMethodAccessorImpl.invoke(_NativeMethodAccessorImpl.java:39_)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(_DelegatingMethodAccessorImpl.java:25_)
at java.lang.reflect.Method.invoke(_Method.java:324_)
at
wicket.protocol.http.WebRequestCycle.invokeInterface(_WebRequestCycle.java:339_)
... 21 more
Caused by: _java.lang.IndexOutOfBoundsException_: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(_ArrayList.java:507_)
at java.util.ArrayList.get(_ArrayList.java:324_)
at wicket.markup.html.form.model.ChoiceList.get(_ChoiceList.java:188_)
at
wicket.markup.html.form.model.ChoiceList.choiceForId(_ChoiceList.java:154_)
at
wicket.markup.html.form.ListMultipleChoice.updateModel(_ListMultipleChoice.java:188_)
at wicket.markup.html.form.Form$12.formComponent(_Form.java:546_)
at wicket.markup.html.form.Form$6.component(_Form.java:411_)
at wicket.MarkupContainer.visitChildren(_MarkupContainer.java:499_)
at wicket.markup.html.form.Form.visitFormComponents(_Form.java:407_)
at wicket.markup.html.form.Form.updateFormComponentModels(_Form.java:538_)
at wicket.markup.html.form.Form.validate(_Form.java:386_)
at wicket.markup.html.form.Form.onValidate(_Form.java:337_)
at wicket.markup.html.form.Form.onFormSubmitted(_Form.java:223_)
... 26 more
Jan-Petter ::-Q
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