easiest way to help you is if you create a quickstart and attach it to
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-igor
On Thu, Oct 7, 2010 at 7:08 AM, Rut Bastoni <rut.bast...@poste.it> wrote:
> Hi everyone,
> i'm trying to implement a custom TextField that fires "onchange" event
> without using Ajax (it is a requirement of my project - i have good reasons
> not to use Ajax).
>
> Looking at the source files of DropDownChoice, CheckBox etc. (they all
> implement the "wantOnSelectionChangedNotifications()" mechanism) i created a
> class:
>
> class OnChangeTextField<T> extends TextField<T> implements IOnChangeListener
> {
>
> // ..... my stuff....
>
> @Override
> public void onSelectionChanged()
> {
> updateModel();
> onSelectionChanged(getModelObject());
> }
>
> protected void onSelectionChanged(final Object newSelection)
> {
> System.out.println("Event fired");
> }
>
> /**
> * Processes the component tag - This is like DropDownChoice and other
> default FormComponents di
> */
> @Override
> protected void onComponentTag(final ComponentTag tag)
> {
> // url that points to this components IOnChangeListener method
> CharSequence url = urlFor(IOnChangeListener.INTERFACE);
>
> Form<?> form = findParent(Form.class);
> if (form != null)
> {
> tag.put("onchange", form.getJsForInterfaceUrl(url));
> }
> super.onComponentTag(tag);
> }
>
> but that doesn't work. When i type into my textfield, i get an error page
> saying:
>
> WicketMessage: Attempt to access unknown request listener interface
> IRedirectListener
>
> Root cause:
>
> org.apache.wicket.WicketRuntimeException: Attempt to access unknown request
> listener interface IRedirectListener
> at org.apache.wicket.markup.html.form.Form.dispatchEvent(Form.java:1320)
> at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:870)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
> at
> org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
>
> .... etc. etc.
>
> I looked into the sources, in particular Form.java, it seems like the url of
> my listener (obtained by "urlFor(IOnChangeListener.INTERFACE)") is wrong,
> because this is the value that get stored in the hidden fild of the form,
> and when the form dispatches events, it does not cause the correct
> IListenerInterfaceRequestTarget be created.
>
> I wonder, why does this mechanism work on DropDownChoice and others, and not
> on my component?
> Is this a bug? Or am I doing some mistake?
>
> Thanks a Lot
>
> Rut Bastoni
>
>
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