richfaces - RF-4.5.x 如何在支持 bean 中获取 PickList 选定项目

Question

我有一个 PickList，我想从组件中获取选定的项目并保留在数据库中。但我不确定如何在我的支持 bean 类中获取选定的值。下面是我的代码。有什么方法可以从 PickList 中获取目标值。

<rich:pickList id="userListShuttle"
       binding="#{sampleBean.pickLst}"
       var="roles"
       value="#{sampleBean.newRoles}"
       sourceCaption="Available Roles"
       targetCaption="Assigned Roles"
       listWidth="440px" listHeight="145px"
       orderControlsVisible="false"
       fastOrderControlsVisible="false">
       <f:selectItems value="#{sampleBean.availableRoles}"/>
</rich:pickList>

Java 代码：

@Component( "sampleBean" )
@Scope( "request" )
public class SampleBean {

    private List<String> newRoles;   
    private List<String> availableRoles;   
    private UIPickList pickLst = new UIPickList();

     /**
     * @return the newRoles
     */
    public List<String> getNewRoles() {
        newRoles = new ArrayList<String>();       
        newRoles.add( "Role 3" );
        newRoles.add( "Role 4" );
        newRoles.add( "Role 5" );
        newRoles.add( "Role 6" );
        Collections.sort( newRoles );
        return newRoles;
    }

    /**
     * @param newRoles the newRoles to set
     */
    public void setNewRoles( List<String> newRoles ) {
        this.newRoles = newRoles;
    }

    /**
     * @return the availableRoles
     */
    public List<String> getAvailableRoles() {
        availableRoles = new ArrayList<String>();
        availableRoles.add( "Role 1" );
        availableRoles.add( "Role 2" );
        availableRoles.add( "Role 3" );
        availableRoles.add( "Role 4" );
        availableRoles.add( "Role 5" );
        availableRoles.add( "Role 6" );
        Collections.sort( availableRoles );
        return availableRoles;
    }

    /**
     * @param availableRoles the availableRoles to set
     */
    public void setAvailableRoles( List<String> availableRoles ) {
        this.availableRoles = availableRoles;
    }

    /**
     * @return the roleShuttle
     */
    public UIPickList getPickLst() {
        return roleShuttle;
    }

    /**
     * @param roleShuttle the roleShuttle to set
     */
    public void setPickLst( UIPickList pickLst) {
        this.pickLst= pickLst;
    }
}

提前致谢。

Answer 1

我做了一些改动，结果如下：

JSF 代码：

   <h:form>
            <h:panelGrid>
                <rich:panel >
                <rich:pickList id="userListShuttle"
                        switchByClick="true"
                        value="#{testClass.newRoles}"
                        sourceCaption="Available Roles"
                        targetCaption="Assigned Roles"
                        listWidth="440px" listHeight="145px"                      
                        valueChangeListener="#{testClass.onSelectListItem}">
                    <f:ajax event="click" render=" " />  
                    <f:selectItems value="#{testClass.availableRoles}" var="label"/>
                 </rich:pickList>
                </rich:panel >
            </h:panelGrid>

        </h:form>

Java 豆：

@ManagedBean
@ViewScoped
public class TestClass {
     private List<String> newRoles;   
    private List<String> availableRoles;   

    public List<String> getNewRoles() {
        newRoles = new ArrayList<String>();       
        newRoles.add( "Role 3" );
        newRoles.add( "Role 4" );
        newRoles.add( "Role 5" );
        newRoles.add( "Role 6" );
        Collections.sort( newRoles );
        return newRoles;
    }

    /**
     * @param newRoles the newRoles to set
     */
    public void setNewRoles( List<String> newRoles ) {
        this.newRoles = newRoles;
    }

    /**
     * @return the availableRoles
     */
    public List<String> getAvailableRoles() {
        availableRoles = new ArrayList<String>();
        availableRoles.add( "Role 1" );
        availableRoles.add( "Role 2" );
        availableRoles.add( "Role 3" );
        availableRoles.add( "Role 4" );
        availableRoles.add( "Role 5" );
        availableRoles.add( "Role 6" );
        availableRoles.add( "Role 7" );
        availableRoles.add( "Role 8" );
        Collections.sort( availableRoles );
        return availableRoles;
    }


    public void setAvailableRoles( List<String> availableRoles ) {
        this.availableRoles = availableRoles;
    }

    public void onSelectListItem(ValueChangeEvent event){
        System.err.println("___________________");
       List <String> items = (List<String>)event.getNewValue();
       for (String item : items){
           System.err.println("Rol:" + item);
       }
    }
}

结果：

Answer 2

@value 是正确的属性，但我不确定如果您在newRoles每次调用 getter 时都覆盖（不要将业务逻辑放入 getter/setter），您希望您的示例如何工作。您不需要访问 UIPickList 的实例，选择的值将保存到newRoles，您可以直接从 bean 中获取。