2 Replies Latest reply on Aug 26, 2008 6:56 AM by Thiagu Mariappan

    how can i sort teh computed column value in data table

    Thiagu Mariappan Novice

      Hai everyone,

      In a page with details for many products, I display the product name with its price information by using the data Table components.

      The columns used for the details of any product are sortable by design. Then I have one more dynamic column “EMIâ€Â� – Equated Monthly Installment. It is not from entity bean but it is computed in session bean and by default the EMI is for 1 year.

      In this page the user can also select payment period by using a drop down and when the EMI period is changed like this, I compute the new EMI value and then display it in the data table.

      And by design, EMI column should also be sortable. I wish to know if this is possible through any Richface component.

      This is my sample xhtml code:

      <h:selectOneMenu value="#{store.emiPerid}" >
      <f:selectItems value="#{emiPeridItems}"/>
      <a4j:support event="onchange" actionListener="#{store.updateEmi}" />
      </h:selectOneMenu >
      
      <rich:dataTable value="#{StoreList}" var="cap" >
       <rich:column sortBy="#{cap.productName}">
       <f:facet name="header">
       <h:outputText value="Product Name"/>
       </f:facet>
       <h:outputText value="#{cap.productName }"/>
       </rich:column>
       <rich:column sortBy="#{cap.price}">
       <f:facet name="header">
       <h:outputText value="Price"/>
       </f:facet>
       <h:outputText value="#{cap.price}"/>
       </rich:column>
       <rich:column>
       <f:facet name="header">
       <h:outputText value="EMI"/>
       </f:facet>
       <h:outputText value="#{StoreEmiMap[cap]}"/>
       </rich:column>
       </rich:dataTable>
      

      This is my session bean code
      @Name("store")
      public class StoreAction implements Store, Serializable
      {
      
       @Out(required=false)
       List<TblStore> StoreList;
      
       double emiPerid;
      
      @Out(required=false)
      List<SelectItem> emiPeridItems
      
      
       @Out(required=false)
       Map<TblStore, double> StoreEmiMap;
      
       @Begin(join=true)
       public String beginAction() {
       emiPeridItems=new List<SelectItem>();
      
      for(int 1=1;i<10;i++)
       emiPeridItems.add(new SelectItem(i+"Years",i));
      
       StoreList= =em.createQuery("select t from TblStore t ").getResultList();
      
       StoreEmiMap =new HashMap<TblStore, double>();
      
       For(TblStore a: StoreList)
      StoreEmiMap.put(a, emi for one year by default);
       }
      
       public void updateEmi(ActionEvent event)
      {
       //Compute the new EMI.
       //Update the computed new EMI values to the HashMap
      }
      }
      

      If the EMI is brought from the entity bean then there is no issue and the column can also be sorted.
      But it is a computed value. So I wish to know how it can be made sortable.

      Any one can help me out on this, Please?

      by
      Thiagu.m