PICKLIST：如何檢索所選項目要添加或刪除

XHTML代碼：

<p:pickList id="pickList" value="#{projectAdminisrationMB.selectedUserGroups}" 
      var="group" 
      itemLabel="#{group}" itemValue="#{group.name}" 
      converter="groupConverter" 
      > 
      <f:facet name="sourceCaption">Belong To</f:facet> 
      <f:facet name="targetCaption">Exclude From</f:facet> 

       <p:column style="width:25%"> 
        <p:graphicImage value="/images/group/#{group.name}.gif" /> 
       </p:column> 

      <p:column style="width:75%;"> 
        #{group.name} 
      </p:column> 
       <p:ajax event="transfer" listener="# 
      {projectAdminisrationMB.onTransferGroup}" update="growl" /> 
      </p:pickList>

我的轉換器：

package tn.talan.testFramework.converter; 


@FacesConverter(value = "groupConverter") 
    public class GroupConverter implements Converter { 

@Override 
public Object getAsObject(FacesContext context, UIComponent component, 
     String value) { 


    return administrationProjectFinal.getGroupByName(value); 

    Object ret = null; 
     if (component instanceof PickList) { 
      Object dualList = ((PickList) component).getValue(); 
      DualListModel dl = (DualListModel) dualList; 
      for (Object o : dl.getSource()) { 
       String id = "" + ((Group) o).getIdBdd(); 
       if (value.equals(id)) { 
        ret = o; 
        break; 
       } 
      } 
      if (ret == null) 
       for (Object o : dl.getTarget()) { 
        String id = "" + ((Project) o).getIdBdd(); 
        if (value.equals(id)) { 
         ret = o; 
         break; 
        } 
       } 
     } 
     return ret; 

} 

@Override 
public String getAsString(FacesContext context, UIComponent component, 
     Object value) { 
    System.out.println("converter group getAsString " + value); 

    String str = ""; 
     if (value instanceof Group) { 
      str = "" + ((Project) value).getIdBdd(); 
     } 
     return str; 


} 
    }

我目標是從選取列表中檢索添加或刪除的項目，所以這裏是 OnTransferGroup方法：

public void onTransferGroup(TransferEvent event) { 

    if(event.isAdd()){ 

     String resMsg; 
      System.out.println("dropped group to be excluded"); 

      for(Object item : event.getItems()) { 

        Group selectedBelongToGroup =(Group) item; 




    resMsg=administrationProjectFinal.exclureUserGroupFn(selectedBelongToGroup 
    ,selectedUserRow); 

        if (resMsg.equals("The project should have at least 
           one administrator")) 
        {setDeleteGroupFlag(true); 
        showErrorMsg(resMsg); 
        } 

        else droppedBelongToGroups.add(selectedBelongToGroup); 

       } 
     } 


    else if(event.isRemove()){ 
     System.out.println("remove"); 
     System.out.println("dropped group to be included"); 
     for(Object item : event.getItems()) { 

     Group selectedExcludeFromGroup = ((Group)item); 
     System.err.println(" n" +selectedExcludeFromGroup.getName()); 
     System.err.println("d "+selectedExcludeFromGroup.getDescription()); 



     droppedExcludeFromToGroups.add(selectedExcludeFromGroup); 

     administrationProjectFinal.inclureUserGroup(selectedExcludeFromGroup 
     ,selectedUserRow); 

     } 



    }     

     }

問題是event.getItems（）列表總是空的。而當我第一次挑選物品時，onTransferGroup（TransferEvent事件）不會被啓動，但在此之後它會變成一團。

那麼如何檢索添加或刪除

來源

2012-09-26 AmiraGL

選定的項目你戴上了「的getAsObject」方法的第一個語句「返回」，這樣就不會達到邏輯的其餘部分。
此外，如果您從getItems方法中獲得空返回值，那肯定意味着轉換器問題，因此請檢查上述內容。

來源

2012-11-09 17:01:53 LdSe

PICKLIST：如何檢索所選項目要添加或刪除

回答

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