3:54 a.m.
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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