Re: How to pre-select a DropDownChoice
http://cwiki.apache.org/WICKET/dropdownchoice.html Hoover, William wrote: Can you add this to the wiki (http://cwiki.apache.org/WICKET/dropdownchoice-examples.html)? It seems like a commonly asked question :o) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How to pre-select a DropDownChoice
DropDownChoice has a lot of contructors. One of them, DropDownChoice(String id, IModel model, IModel choices, ...) The first model, could be named selectedModel. And represents the selected object, with a wicket model.
Re: How to pre-select a DropDownChoice
Funny, I answered the same question to my colleague this morning.
Below the code I gave him.
What happens is that the model is wrapped in another model. The wrapping
model has a defaultModel that is used to return a value when the
underlying model returns null.
Below the model wrapper you find an example on how to use it.
If you find something better, please let us know :)
import org.apache.wicket.model.IChainingModel;
import org.apache.wicket.model.AbstractWrapModel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.IWrapModel;
/**
*
* @author Erik van Oosten
*/
public class DefaultingModelWrapper implements IWrapModel {
private IModel wrappedModel;
private IModel defaultModel;
public DefaultingModelWrapper(IModel wrappedModel, IModel
defaultModel) {
this.wrappedModel = wrappedModel;
this.defaultModel = defaultModel;
}
public IModel getWrappedModel() {
return wrappedModel;
}
public Object getObject() {
Object value = wrappedModel.getObject();
if (value == null) {
value = defaultModel.getObject();
}
return value;
}
public void setObject(Object object) {
wrappedModel.setObject(object);
}
public void detach() {
wrappedModel.detach();
defaultModel.detach();
}
}
public class DefaultingCountryDropDown extends CountryDropDown {
public DefaultingCountryDropDown(String id, IModel model) {
super(id, new DefaultingModelWrapper(model, new Model(NL)));
}
public DefaultingCountryDropDown(String id) {
super(id, new DefaultingModelWrapper(getModel(), new Model(NL)));
}
}
Regards,
Erik.
Juan Gabriel Arias wrote:
DropDownChoice has a lot of contructors. One of them,
DropDownChoice(String id, IModel model, IModel choices, ...)
The first model, could be named selectedModel. And represents the selected
object, with a wicket model.
--
Erik van Oosten
http://day-to-day-stuff.blogspot.com/
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
RE: How to pre-select a DropDownChoice
Can you add this to the wiki
(http://cwiki.apache.org/WICKET/dropdownchoice-examples.html)? It seems like a
commonly asked question :o)
-Original Message-
From: Erik van Oosten [mailto:[EMAIL PROTECTED]
Sent: Friday, March 14, 2008 9:35 AM
To: users@wicket.apache.org
Subject: Re: How to pre-select a DropDownChoice
Funny, I answered the same question to my colleague this morning.
Below the code I gave him.
What happens is that the model is wrapped in another model. The wrapping
model has a defaultModel that is used to return a value when the
underlying model returns null.
Below the model wrapper you find an example on how to use it.
If you find something better, please let us know :)
import org.apache.wicket.model.IChainingModel;
import org.apache.wicket.model.AbstractWrapModel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.IWrapModel;
/**
*
* @author Erik van Oosten
*/
public class DefaultingModelWrapper implements IWrapModel {
private IModel wrappedModel;
private IModel defaultModel;
public DefaultingModelWrapper(IModel wrappedModel, IModel
defaultModel) {
this.wrappedModel = wrappedModel;
this.defaultModel = defaultModel;
}
public IModel getWrappedModel() {
return wrappedModel;
}
public Object getObject() {
Object value = wrappedModel.getObject();
if (value == null) {
value = defaultModel.getObject();
}
return value;
}
public void setObject(Object object) {
wrappedModel.setObject(object);
}
public void detach() {
wrappedModel.detach();
defaultModel.detach();
}
}
public class DefaultingCountryDropDown extends CountryDropDown {
public DefaultingCountryDropDown(String id, IModel model) {
super(id, new DefaultingModelWrapper(model, new Model(NL)));
}
public DefaultingCountryDropDown(String id) {
super(id, new DefaultingModelWrapper(getModel(), new Model(NL)));
}
}
Regards,
Erik.
Juan Gabriel Arias wrote:
DropDownChoice has a lot of contructors. One of them,
DropDownChoice(String id, IModel model, IModel choices, ...)
The first model, could be named selectedModel. And represents the selected
object, with a wicket model.
--
Erik van Oosten
http://day-to-day-stuff.blogspot.com/
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
RE: How to pre-select a DropDownChoice
Yeah, I figured that out last night. That's actually a great way of handling the component's state. Thanks for your input. -Original Message- From: Nick Heudecker [mailto:[EMAIL PROTECTED] Sent: Thursday, March 13, 2008 5:57 PM To: users@wicket.apache.org Subject: Re: How to pre-select a DropDownChoice Set the model of the DDC to the value you want to have selected. On Thu, Mar 13, 2008 at 7:53 PM, Michael Mehrle [EMAIL PROTECTED] wrote: I feel silly asking this, but I can't figure it out. I need to set my DropDownChoice component to the id I'm passing into my page via a pageparam. How do I do that? I don't see anything resembling setSelected(). Michael - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Nick Heudecker Professional Wicket Training Consulting http://www.systemmobile.com Eventful - Intelligent Event Management http://www.eventfulhq.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How to pre-select a DropDownChoice
Set the model of the DDC to the value you want to have selected. On Thu, Mar 13, 2008 at 7:53 PM, Michael Mehrle [EMAIL PROTECTED] wrote: I feel silly asking this, but I can't figure it out. I need to set my DropDownChoice component to the id I'm passing into my page via a pageparam. How do I do that? I don't see anything resembling setSelected(). Michael - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Nick Heudecker Professional Wicket Training Consulting http://www.systemmobile.com Eventful - Intelligent Event Management http://www.eventfulhq.com
