Re: [Wicket-user] DropDownChoice binding question
ok, I see where you're going with this.
very cool.
My enum is in a helper class and I started writing conversion methods in the
helper class. But I like the way you wrapped your conversion methods
in a class to use on the Page class.
I also gave some thought last night to using a MapInteger, String with
the same conversion technique. Then my dropdown uses Integers and
I can do a map.get() in getDisplayValue() for the String.
Thanks for your help, Igor.
igor.vaynberg wrote:
you are passing a list of enum objects into the list model of the dropdown
choice, that means the one selected object out of that list - of type enum
-
will be set into the model object.
so there are two ways to do this
you can pass in a list of ints into the choice component, that way the
selected int will be set into your model
or you can write a model decorator that does the transform
class SizeEnumToIntModel extends Model {
private final IModel delegate;
public SizeEnumToIntModel(IModel delegate) {
this.delegate=delegate; }
public Object getObject(Component c) {return Size.forValue(
delegate.getObject(c); // convert int to enum }
public void setObject(Component c, Object o) {
delegate.setObject(((Size)o).getintvalue();
// convert enum to int }
public void detach() { delegate.detach(); }
}
then
new DropDownChoice(id, new SizeEnumToIntModel(new PropertyModel(form,
size))
you lose the nice compound model syntax, but oh well
you might also be able to use a convert to accomplish the same, but i
havent
looked into that
-igor
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[Wicket-user] DropDownChoice binding question
Greetings,
I am trying to take the value (only) of a DropDownChoice
and put it in a model set on the Form.
Ideally, I'd like to use a (java 5) enum, but any type of
name value pair will work.
For example, if I'm trying to set the size of a Shirt class,
here is my Shirt, and a sample enum:
public class Shirt
{
private int size;
private int color;
//. . .
//(setters and getters removed to compact)
}
public static enum SIZE
{
Small(2),
Medium(4),
Large(6),
private String id;
SIZE(String id)
{
this.id = id;
}
public String getId()
{
return id;
}
public String getName()
{
return id + - + this.toString();
}
}
Now, in my Form, I set the shirt as a model. When I add my size
DropDownChoice to the form, I am binding it to the size field of my
Shirt class:
private class InputForm extends Form
{
public InputForm(String name)
{
super(name, new CompoundPropertyModel(new Shirt()));
DropDownChoice sizeChoice = new DropDownChoice(size,
Arrays.asList(SIZE.values()),
new ChoiceRenderer(name, id));
sizeChoice.setRequired(true);
add(sizeChoice);
//. . .
}
}
When I submit this form, it fails because I get a Small, Medium, or
Large
object back. What I want is the id of the selected object.
I looked at the examples in DropDownChoicePage.java in the compref package
of the
wicket examples and I could do that: create a list of Integers and use a
switch
or other technique to get the display value.
What I really want to do is bind the id property of the enum to the
Shirt.size property.
I've done this in reverse with a PropertyModel, binding a property of the
model to a field
on the page. I having some trouble doing it this way.
I read through a number of the posts on DropDownChoice as a search item.
None seem to hit the
nail on the head. One poster mentioned using ChoiceRenderer, but I'm not
following how
that would work.
Any suggestions would be greatly appreciated!
I'm using Wicket 1.2.3 and java 5 in Tomcat.
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Re: [Wicket-user] DropDownChoice binding question
IChoiceRenderer allows you to specify the id and display values for a
DropDownChoice. It's exactly what you're looking for. To explain a bit:
getDisplayValue(...) - returns the value you want the user to see. Small,
Medium, etc. This is where you'd return SIZE.getName().
getIdValue(...) returns the value submitted to the application. This is
where you'd return SIZE.getId().
On 12/30/06, Flavius [EMAIL PROTECTED] wrote:
Greetings,
I am trying to take the value (only) of a DropDownChoice
and put it in a model set on the Form.
Ideally, I'd like to use a (java 5) enum, but any type of
name value pair will work.
For example, if I'm trying to set the size of a Shirt class,
here is my Shirt, and a sample enum:
public class Shirt
{
private int size;
private int color;
//. . .
//(setters and getters removed to compact)
}
public static enum SIZE
{
Small(2),
Medium(4),
Large(6),
private String id;
SIZE(String id)
{
this.id = id;
}
public String getId()
{
return id;
}
public String getName()
{
return id + - + this.toString();
}
}
Now, in my Form, I set the shirt as a model. When I add my size
DropDownChoice to the form, I am binding it to the size field of my
Shirt class:
private class InputForm extends Form
{
public InputForm(String name)
{
super(name, new CompoundPropertyModel(new
Shirt()));
DropDownChoice sizeChoice = new
DropDownChoice(size,
Arrays.asList(SIZE.values()),
new ChoiceRenderer(name, id));
sizeChoice.setRequired(true);
add(sizeChoice);
//. . .
}
}
When I submit this form, it fails because I get a Small, Medium, or
Large
object back. What I want is the id of the selected object.
I looked at the examples in DropDownChoicePage.java in the compref package
of the
wicket examples and I could do that: create a list of Integers and use a
switch
or other technique to get the display value.
What I really want to do is bind the id property of the enum to the
Shirt.size property.
I've done this in reverse with a PropertyModel, binding a property of the
model to a field
on the page. I having some trouble doing it this way.
I read through a number of the posts on DropDownChoice as a search item.
None seem to hit the
nail on the head. One poster mentioned using ChoiceRenderer, but I'm not
following how
that would work.
Any suggestions would be greatly appreciated!
I'm using Wicket 1.2.3 and java 5 in Tomcat.
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Re: [Wicket-user] DropDownChoice binding question
I tried this:
DropDownChoice severityChoice = new
DropDownChoice(size,
Arrays.asList(SIZE.values()),
new ChoiceRenderer()
{
public Object getDisplayValue(Object object)
{
return ((SIZE)object).getName();
}
public String getIdValue(Object object, int
index)
{
return ((SIZE)object).getId();
}
});
The page renders fine. But when I submit the form, I get this error:
WicketMessage: unable to set object Small, model:
Model:classname=[wicket.model.CompoundPropertyModel]
Root cause:
wicket.util.convert.ConversionException: Cannot parse 'Small' using format
[EMAIL PROTECTED]
at
wicket.util.convert.converters.AbstractConverter.newConversionException(AbstractConverter.java:72)
As I understand it, it's trying to set an int in the Shirt model for size,
but the drop down returned the Small object. What I really need is
Small.getId(). So I need to tell the form to bind the id property of the
return object to the field size
Nick Heudecker wrote:
IChoiceRenderer allows you to specify the id and display values for a
DropDownChoice. It's exactly what you're looking for. To explain a bit:
getDisplayValue(...) - returns the value you want the user to see.
Small,
Medium, etc. This is where you'd return SIZE.getName().
getIdValue(...) returns the value submitted to the application. This is
where you'd return SIZE.getId().
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Re: [Wicket-user] DropDownChoice binding question
Can I see a bit more of your code? What you've posted looks good, so it's
possible something else is causing the problem.
You could try ##wicket on Freenode for more help.
On 12/30/06, Flavius [EMAIL PROTECTED] wrote:
I tried this:
DropDownChoice severityChoice = new
DropDownChoice(size,
Arrays.asList(SIZE.values()),
new ChoiceRenderer()
{
public Object getDisplayValue(Object
object)
{
return ((SIZE)object).getName();
}
public String getIdValue(Object object,
int index)
{
return ((SIZE)object).getId();
}
});
The page renders fine. But when I submit the form, I get this error:
WicketMessage: unable to set object Small, model:
Model:classname=[wicket.model.CompoundPropertyModel]
Root cause:
wicket.util.convert.ConversionException: Cannot parse 'Small' using format
[EMAIL PROTECTED]
at
wicket.util.convert.converters.AbstractConverter.newConversionException(
AbstractConverter.java:72)
As I understand it, it's trying to set an int in the Shirt model for size,
but the drop down returned the Small object. What I really need is
Small.getId(). So I need to tell the form to bind the id property of the
return object to the field size
Nick Heudecker wrote:
IChoiceRenderer allows you to specify the id and display values for a
DropDownChoice. It's exactly what you're looking for. To explain a
bit:
getDisplayValue(...) - returns the value you want the user to see.
Small,
Medium, etc. This is where you'd return SIZE.getName().
getIdValue(...) returns the value submitted to the application. This is
where you'd return SIZE.getId().
--
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Re: [Wicket-user] DropDownChoice binding question
you are passing a list of enum objects into the list model of the dropdown
choice, that means the one selected object out of that list - of type enum -
will be set into the model object.
so there are two ways to do this
you can pass in a list of ints into the choice component, that way the
selected int will be set into your model
or you can write a model decorator that does the transform
class SizeEnumToIntModel extends Model {
private final IModel delegate;
public SizeEnumToIntModel(IModel delegate) {
this.delegate=delegate; }
public Object getObject(Component c) {return Size.forValue(
delegate.getObject(c); // convert int to enum }
public void setObject(Component c, Object o) {
delegate.setObject(((Size)o).getintvalue();
// convert enum to int }
public void detach() { delegate.detach(); }
}
then
new DropDownChoice(id, new SizeEnumToIntModel(new PropertyModel(form,
size))
you lose the nice compound model syntax, but oh well
you might also be able to use a convert to accomplish the same, but i havent
looked into that
-igor
On 12/30/06, Flavius [EMAIL PROTECTED] wrote:
I tried this:
DropDownChoice severityChoice = new
DropDownChoice(size,
Arrays.asList(SIZE.values()),
new ChoiceRenderer()
{
public Object getDisplayValue(Object
object)
{
return ((SIZE)object).getName();
}
public String getIdValue(Object object,
int index)
{
return ((SIZE)object).getId();
}
});
The page renders fine. But when I submit the form, I get this error:
WicketMessage: unable to set object Small, model:
Model:classname=[wicket.model.CompoundPropertyModel]
Root cause:
wicket.util.convert.ConversionException: Cannot parse 'Small' using format
[EMAIL PROTECTED]
at
wicket.util.convert.converters.AbstractConverter.newConversionException(
AbstractConverter.java:72)
As I understand it, it's trying to set an int in the Shirt model for size,
but the drop down returned the Small object. What I really need is
Small.getId(). So I need to tell the form to bind the id property of the
return object to the field size
Nick Heudecker wrote:
IChoiceRenderer allows you to specify the id and display values for a
DropDownChoice. It's exactly what you're looking for. To explain a
bit:
getDisplayValue(...) - returns the value you want the user to see.
Small,
Medium, etc. This is where you'd return SIZE.getName().
getIdValue(...) returns the value submitted to the application. This is
where you'd return SIZE.getId().
--
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Re: [Wicket-user] DropDownChoice binding question
not sure what's wrong with your code, but i've done enum selection in
voicetribe with code that looks like the following:
add(new DropDownChoice(genre, new Model()
{
@Override
public Object getObject(Component component)
{
return Genre.valuesSortedByLocalizedName();
}
}, new IChoiceRenderer()
{
public Object getDisplayValue(Object object)
{
return ((Genre)object).getLocalizedName();
}
public String getIdValue(Object object, int index)
{
return object.toString();
}
}));
Flavius wrote:
I tried this:
DropDownChoice severityChoice = new
DropDownChoice(size,
Arrays.asList(SIZE.values()),
new ChoiceRenderer()
{
public Object getDisplayValue(Object object)
{
return ((SIZE)object).getName();
}
public String getIdValue(Object object, int
index)
{
return ((SIZE)object).getId();
}
});
The page renders fine. But when I submit the form, I get this error:
WicketMessage: unable to set object Small, model:
Model:classname=[wicket.model.CompoundPropertyModel]
Root cause:
wicket.util.convert.ConversionException: Cannot parse 'Small' using format
[EMAIL PROTECTED]
at
wicket.util.convert.converters.AbstractConverter.newConversionException(AbstractConverter.java:72)
As I understand it, it's trying to set an int in the Shirt model for size,
but the drop down returned the Small object. What I really need is
Small.getId(). So I need to tell the form to bind the id property of the
return object to the field size
Nick Heudecker wrote:
IChoiceRenderer allows you to specify the id and display values for a
DropDownChoice. It's exactly what you're looking for. To explain a bit:
getDisplayValue(...) - returns the value you want the user to see.
Small,
Medium, etc. This is where you'd return SIZE.getName().
getIdValue(...) returns the value submitted to the application. This is
where you'd return SIZE.getId().
--
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