1 Reply Latest reply on May 11, 2007 11:23 AM by Zeng Qi

    Problem of Multi selectOneMenu

    Zeng Qi Newbie

      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?