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java.lang.Objectorg.apache.wicket.markup.html.form.ChoiceRenderer<T>
T - The model object typepublic class ChoiceRenderer<T>
Default implementation of IChoiceRenderer. Usage:
new DropDownChoice<User>("users", new Model<User>(selectedUser), listOfUsers)
creates a DropDownChoice of users and the display value will be toString() and the id the index
of the object in the ListOfUsers.
new DropDownChoice<User>("users", new Model<User>(selectedUser), listOfUsers,
new ChoiceRenderer<User>("name"))
creates a DropDownChoice of users and the display value will be looked up by property expression
("name") and the id the index of the object in the ListOfUsers
new DropDownChoice<User>("users", new Model<User>(selectedUser), listOfUsers,
new ChoiceRenderer<User>("name", "id"))
creates a DropDownChoice of users and the display value will be looked up by property expression
("name") and the id will be looked up by the property expression "id"
| Constructor Summary | |
|---|---|
ChoiceRenderer()
Construct. |
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ChoiceRenderer(String displayExpression)
Construct. |
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ChoiceRenderer(String displayExpression,
String idExpression)
Construct. |
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| Method Summary | |
|---|---|
Object |
getDisplayValue(T object)
Get the value for displaying to an end user. |
String |
getIdValue(T object,
int index)
This method is called to get the id value of an object (used as the value attribute of a choice element) The id can be extracted from the object like a primary key, or if the list is stable you could just return a toString of the index. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
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public ChoiceRenderer()
public ChoiceRenderer(String displayExpression)
displayExpression - A property expression to get the display value
public ChoiceRenderer(String displayExpression,
String idExpression)
displayExpression - A property expression to get the display valueidExpression - A property expression to get the id value| Method Detail |
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public Object getDisplayValue(T object)
IChoiceRenderer
getDisplayValue in interface IChoiceRenderer<T>object - the actual object
IChoiceRenderer.getDisplayValue(java.lang.Object)
public String getIdValue(T object,
int index)
IChoiceRenderer
Note that the given index can be -1 if the object in question is not contained in the
available choices.
getIdValue in interface IChoiceRenderer<T>object - The object for which the id should be generatedindex - The index of the object in the choices list.
IChoiceRenderer.getIdValue(java.lang.Object, int)
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