a4j and SelectOneMenu again

原来想用a4j和richfaces做一点rich应用，没想到动态填充SelectItems的SelectOneMenu不能绑定值到bean。错误提示"value is not valid"。有人说是转换的时候出了问题要重写equal函数，但是我只使用字符串作为SelectItem的 label and key. 难道字符串之间也不能比较吗？不能再浪费时间了，以后有时间找到JSF的源码看看。现在还是老老实实多做几个页面算了。

页面：

<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
                             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
	xmlns:s="http://jboss.com/products/seam/taglib"
	xmlns:ui="http://java.sun.com/jsf/facelets"
	xmlns:f="http://java.sun.com/jsf/core"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:a="http://richfaces.org/a4j"
	xmlns:rich="http://richfaces.org/rich" template="layout/template.xhtml">

	<ui:define name="body">

		<div class="title"><h:outputText
			value="View dealers in a region" /></div>

		<h:form id="forma">
			<h:outputText value="Please select a country:" />
			<h:selectOneRadio value="#{Regions.country}">
				<f:selectItem itemLabel="USA" itemValue="USA" />
				<f:selectItem itemLabel="CANADA" itemValue="CANADA" />
				<a:support event="onchange" reRender="regionPanel" />
			</h:selectOneRadio>
		</h:form>

		<h:form id="formb">
			<a:outputPanel id="regionPanel">
				<s:decorate id="regionDecoration" template="layout/display.xhtml">
					<ui:define name="label">Select a region:</ui:define>
<!--					<h:selectOneMenu id="selectRegion" value="#{dealerList.region}"	converter="SelectItemConverter">-->
						<rich:comboBox id="selectRegion" value="#{dealerList.region}"
							converter="SelectItemConverter">
							<f:selectItems value="#{Regions.regionItems}" />
						</rich:comboBox>
<!--					</h:selectOneMenu>-->

				</s:decorate>
			</a:outputPanel>

			<div class="actionButtons"><a:commandButton
				id="showDealersButton" reRender="dealerResults" value="Show Dealers">
			</a:commandButton> <a:commandButton id="showAllDealersButton" reRender="dealerResults"
				value="Show All Dealers" action="#{dealerList.setRegion('%')}">
			</a:commandButton></div>
		</h:form>

		<h:messages globalOnly="true" styleClass="message" />
		<a:outputPanel id="dealerResults">
			<h:outputText value="OutText:Current region is: #{dealerList.ejbql}" />
			<h:inputText
				value="InputText:Current region is: #{dealerList.region}" />

			<rich:panel>
				<f:facet name="header">dealerList</f:facet>

				<div class="results"><h:outputText value="No dealer exists"
					rendered="#{empty dealerList.resultList}" /> <h:dataTable
					id="dealerList" var="dealer" value="#{dealerList.resultList}"
					rendered="#{not empty dealerList.resultList}">
					<h:column>
						<f:facet name="header">Id</f:facet>
						<h:outputText id="dealderId" value="#{dealer.id}">
						</h:outputText>
					</h:column>
					<h:column>
						<f:facet name="header">Name</f:facet>
						<s:link id="dealer" value="#{dealer.name}" view="/dealer.xhtml">
							<f:param name="dealerId" value="#{dealer.id}" />
						</s:link>
					</h:column>
					<h:column>
						<f:facet name="header">Region</f:facet>
						<h:outputText id="region" value="#{dealer.region}"></h:outputText>
					</h:column>
				</h:dataTable></div>
			</rich:panel>
		</a:outputPanel>

		<div class="actionButtons"><s:button id="done"
			value="Create dealer" view="/dealer.xhtml" /></div>

	</ui:define>

</ui:composition>

RegionBean：

package com.govr.catalog.session;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.ejb.Remove;
import javax.ejb.Stateful;
import javax.ejb.Stateless;
import javax.faces.model.SelectItem;

import org.jboss.seam.annotations.Destroy;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Logger;
import org.jboss.seam.log.Log;
import org.jboss.seam.faces.FacesMessages;

import com.govr.catalog.entity.CanadaProvinces;
import com.govr.catalog.entity.USAStates;

//@Stateless
@Stateful
@Name("Regions")
public class RegionsBean implements Regions {

	@Logger
	private Log log;

	@In
	FacesMessages facesMessages;

	public void regions() {
		// implement your business logic here
		log.info("Regions.regions() action called");
		facesMessages.add("regions");
	}

	private String country;
	private String selectARegionLabel;

	public List getRegionList(String country) {

		List l = new ArrayList();
	
		if ("USA".equals(country))
			l = USAStates.getRegionList();

		if ("CANADA".equals(country))
			l = CanadaProvinces.getRegionList();

		return l;

	}

	public Map getRegionMap(String country) {

		Map l = new HashMap();

		if ("USA".equals(country))
			for (String s : USAStates.states)
				l.put(s, s);

		if ("CANADA".equals(country))
			for (String s : CanadaProvinces.states)
				l.put(s, s);

		return l;

	}

	public List getRegionList() {

		List l = new ArrayList();

		if ("USA".equals(country))
			l = USAStates.getRegionList();

		if ("CANADA".equals(country))
			l = CanadaProvinces.getRegionList();

		return l;

	}

	public List<SelectItem> getRegionItems() {

		 List<SelectItem>  l = new ArrayList<SelectItem>();
//		l.add(new SelectItem(""));
		if ("USA".equals(country)) {
			for (String s : USAStates.states)
				l.add(new SelectItem(s,s));
			setSelectARegionLabel("Please select a state:");
		} else if ("CANADA".equals(country)) {
			for (String s : CanadaProvinces.states)
				l.add(new SelectItem(s,s));
			setSelectARegionLabel("Please select a provice:");

		} else {
			l.add(new SelectItem("No region to show","No region to show"));
		}
		return l;
	}

	public void setCountry(String country) {
		this.country = country;
	}

	public String getCountry() {
		return country;
	}

	public void setSelectARegionLabel(String selectARegionLabel) {
		this.selectARegionLabel = selectARegionLabel;
	}

	public String getSelectARegionLabel() {
		return selectARegionLabel;
	}

	@Remove
	@Destroy
	public void destroy() {
	}

	// add additional action methods

}

DealerList：

package com.govr.catalog.session;

import javax.faces.model.SelectItem;

import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.web.RequestParameter;
import org.jboss.seam.framework.EntityQuery;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.ScopeType;

@Name("dealerList")
@Scope(ScopeType.CONVERSATION)
public class DealerList extends EntityQuery {
	
//	@RequestParameter
//	String region = "";

//	@In
	private String region;
	private SelectItem selectedRegionItem;
	
	@Override
	public String getEjbql() {

			setRegion(((String)getRegion()).trim());
			return "select dealer from Dealer dealer where dealer.region like '"
				+ getRegion() + "'";
	}


	public void setRegion(String region) {
		this.region =  region;
	}


	public String getRegion() {
		if (region == null)
			setRegion("");
		return  region;
	}


	public void setSelectedRegionItem(SelectItem selectedRegionItem) {
		this.selectedRegionItem = selectedRegionItem;
		setRegion((String) this.selectedRegionItem.getValue());
	}


	public SelectItem getSelectedRegionItem() {
		return selectedRegionItem;
	}

}