[jboss-user] [JBoss Seam] - Problem of Multi selectOneMenu

[zengqi]

Hi, all. I want to setup 4 level category selectOneMenu. When the first category value change, the second category selectItems will change automaticlly according to the value of the first category. 

I use QuoteHisSearch to store search infomation:
package com.baida.beans;

import java.util.Date;
import java.util.LinkedList;
import java.util.List;

import javax.persistence.EntityManager;

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

@Name("quoteHisSearch")
public class QuoteHisSearch {
	/*
	 * search parameters
	 */
	
	private Category topCategory;
	private Category secondCategory;
	private Category thirdCategory;
	private Category fourthCategory;
	
	private List topCategories;
	private List secondCategories;
	private List thirdCategories;
	private List fourthCategories;
	
		
	public Category getTopCategory() {
		return topCategory;
	}
	public void setTopCategory(Category topCategory) {
		
		this.topCategory = topCategory;		
	}
	public Category getSecondCategory() {
			
		return secondCategory;
	}
	public void setSecondCategory(Category secondCategory) {
		this.secondCategory = secondCategory;		
	}
	
	public Category getThirdCategory() {
		
			
		return thirdCategory;
	}
	public void setThirdCategory(Category thirdCategory) {
		this.thirdCategory = thirdCategory;
		
	}
	public Category getFourthCategory() {
		 
		return fourthCategory;
	}
	public void setFourthCategory(Category fourthCategory) {
		this.fourthCategory = fourthCategory;
	}
	public List getTopCategories() {
		
		return topCategories;
	}
	
	public void setTopCategories(List topCategories) {
		this.topCategories = topCategories;
	}
	
	
	public List getSecondCategories() {
		
		return secondCategories;
	}
	
	public void setSecondCategories(List secondCategories) {
		this.secondCategories = secondCategories;
	}	
	
	public List getThirdCategories() {
		
		return thirdCategories;
	}
	
	public void setThirdCategories(List thirdCategories) {
		this.thirdCategories = thirdCategories;
	}
	
	public List getFourthCategories() {
		
		return fourthCategories;
	}
	
	public void setFourthCategories(List fourthCategories) {
		this.fourthCategories = fourthCategories;
	}	

}

In QuoteHisList.java, I add these two function:
public void updateCategories(){
		quoteHisSearch.setTopCategories(getChildrenCatgorys(null));
		if(quoteHisSearch.getTopCategory() != null)
			quoteHisSearch.setSecondCategories(getChildrenCatgorys(quoteHisSearch.getTopCategory()));
		if(quoteHisSearch.getSecondCategory() != null)
			quoteHisSearch.setThirdCategories(getChildrenCatgorys(quoteHisSearch.getSecondCategory()));
		if(quoteHisSearch.getThirdCategory() != null)
			quoteHisSearch.setFourthCategories(getChildrenCatgorys(quoteHisSearch.getThirdCategory()));
		
	}
	
	public List getChildrenCatgorys(Category category){
		EntityManager entityManager = getEntityManager();
		List children = null;
		if(category == null){
			children = entityManager.createQuery("from Category where category=null").getResultList();
		}else{
			children = (List)entityManager.createQuery("from Category where category=:category")
						.setParameter("category", category)
						.getResultList();		
		}
		if(children == null){
			children = new LinkedList();
		}
		
		return children;
	}

Then add  in QuoteList.page.xhtml.

QuoteList.xhtml's code is like that:
<s:decorate id="categoryDecoration" template="layout/display.xhtml">
                <ui:define name="label">#{messages['category.category']}</ui:define>
                <h:selectOneMenu id="topCategory" 
                				value="#{quoteHisList.quoteHisSearch.topCategory}" onchange="submit()">
                  <s:selectItems value="#{quoteHisList.quoteHisSearch.topCategories}" 
                  				var="category" 
                  				label="#{category.categoryName}"
                  				noSelectionLabel="#{messages['common.noSelection']}"
                              	hideNoSelectionLabel="false"/>
                  <s:convertEntity/>
                                 
                </h:selectOneMenu>
                <h:selectOneMenu id="secondCategory" value="#{quoteHisList.quoteHisSearch.secondCategory}" >
                  <s:selectItems value="#{quoteHisList.quoteHisSearch.secondCategories}" 
                  				var="category" 
                  				label="#{category.categoryName}"
                  				noSelectionLabel="#{messages['common.noSelection']}"
                              	hideNoSelectionLabel="false"/>
                  <s:convertEntity/>
                  <a:support event="onselectchange" reRender="categoryDecoration"/> 
                </h:selectOneMenu>
                <h:selectOneMenu id="thirdCategory" value="#{quoteHisList.quoteHisSearch.thirdCategory}" >              
                  <s:selectItems value="#{quoteHisList.quoteHisSearch.thirdCategories}" 
                  				var="category" 
                  				label="#{category.categoryName}"
                  				noSelectionLabel="#{messages['common.noSelection']}"
                              	hideNoSelectionLabel="false"/>
                  <s:convertEntity/>
                  <a:support event="onselectchange" reRender="categoryDecoration"/> 
                </h:selectOneMenu>
                
            </s:decorate>


I can get the top categories as well. But when I change the top category, the seconde category selectitems will not change. I add log to look what's the wrong, I found that the qouteHisSearch.topCategory is always not changed, so the method updateCategories() will not change the value of  quoteHisSearch.secondCategories.

Would you help me to fix this problem?

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