我发现下面的Wicket示例代码:您如何从Wicket的下拉列表中获取值?
package org.apache.wicket.examples.ajax.builtin;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.model.AbstractReadOnlyModel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.model.PropertyModel;
/**
* Linked select boxes example
*
* @author Igor Vaynberg (ivaynberg)
*/
public class ChoicePage extends BasePage
{
private String selectedMake;
private final Map<String, List<String>> modelsMap = new HashMap<String, List<String>>(); // map:company->model
/**
* @return Currently selected make
*/
public String getSelectedMake()
{
return selectedMake;
}
/**
* @param selectedMake
* The make that is currently selected
*/
public void setSelectedMake(String selectedMake)
{
this.selectedMake = selectedMake;
}
/**
* Constructor.
*/
public ChoicePage()
{
modelsMap.put("AUDI", Arrays.asList(new String[] { "A4", "A6", "TT" }));
modelsMap.put("CADILLAC", Arrays.asList(new String[] { "CTS", "DTS", "ESCALADE", "SRX",
"DEVILLE" }));
modelsMap.put("FORD", Arrays.asList(new String[] { "CROWN", "ESCAPE", "EXPEDITION",
"EXPLORER", "F-150" }));
IModel<List<? extends String>> makeChoices = new AbstractReadOnlyModel<List<? extends String>>()
{
@Override
public List<String> getObject()
{
Set<String> keys = modelsMap.keySet();
List<String> list = new ArrayList<String>(keys);
return list;
}
};
IModel<List<? extends String>> modelChoices = new AbstractReadOnlyModel<List<? extends String>>()
{
@Override
public List<String> getObject()
{
List<String> models = modelsMap.get(selectedMake);
if (models == null)
{
models = Collections.emptyList();
}
return models;
}
};
Form<?> form = new Form("form");
add(form);
final DropDownChoice<String> makes = new DropDownChoice<String>("makes",
new PropertyModel<String>(this, "selectedMake"), makeChoices);
final DropDownChoice<String> models = new DropDownChoice<String>("models",
new Model<String>(), modelChoices);
models.setOutputMarkupId(true);
form.add(makes);
form.add(models);
makes.add(new AjaxFormComponentUpdatingBehavior("onchange")
{
@Override
protected void onUpdate(AjaxRequestTarget target)
{
target.addComponent(models);
}
});
}
}
假设我有下面的类:
public class car{
private String name;
private String model;
public setname(String n){
this.name=n;
}
public setModel(String m){
this.model=m;
}
/// and getters...
}
我想创建的示例代码car
对象,并指定选择的值在下拉到car
对象。我怎样才能做到这一点?
我做了什么,恩喜欢阿卡尔=新车说(“”” “);最终DropDownChoice makes = new DropDownChoice (“makes”, new PropertyModel (aCar,“name”),makeChoices); final DropDownChoice models = new DropDownChoice (“models”, new PropertyModel (aCar,“model”),modelChoices);它不能正常工作 –
2010-11-19 20:01:40
我通过编码aCar.setName(this.selectedMake)得到选定的汽车名称;但我不知道如何分配汽车模型 – 2010-11-19 20:15:39
@ajdar,你不应该手工分配任何东西。我正在测试。 – Pops 2010-11-19 21:03:17