Question

我有一个remmoteCommand更新List，在项加载后重复渲染selectBooleanCheckbox。但是，未在复选框中正确设置值，所有这些值都未选中，旁边有一些具有selected属性（布尔值）的项设置为true。

如果我只是在加载列表后在支持bean中设置一个Item，它只适用于该Item。可能是什么问题？

的index.xhtml

 <h:form>
        <h:panelGroup id="itemsHolder">
            <h:panelGrid rendered="#{backingBean.items != null}">
                <h:selectBooleanCheckbox value="#{backingBean.item.selected}" disabled="#{backingBean.rendered}" /> #{backingBean.item.name}
                <ui:repeat value="#{backingBean.items.toArray()}" var="option" >
                    <h:selectBooleanCheckbox value="#{option.selected}" disabled="#{backingBean.rendered}" />
                    #{option.name}
                    <br />
                </ui:repeat>
            </h:panelGrid>
        </h:panelGroup>
        <p:remoteCommand rendered="#{backingBean.rendered}"
                         name="initItems"
                         actionListener="#{backingBean.initItems()}"
                         process="@this"
                         update="itemsHolder"/>

    </h:form>

    <ui:fragment rendered="#{backingBean.rendered}">
        <script>
            $(document).ready(function () {
                setTimeout(function () {
                    initItems();
                }, 3000);

            });
        </script>
    </ui:fragment>

BackingBean.java

@Component
@ManagedBean
@Scope("view")
public class BackingBean {

private boolean rendered = true;

private Set<Item> items;

private Item item;

public void initItems() {
    items = new LinkedHashSet<>();
    items.add(new Item("item 1", true, "1"));
    items.add(new Item("item 2", false, "2"));
    items.add(new Item("item 3", true, "3"));

    item = new Item("lonely item", true, "4");
   }

//Getters and setters
}

更新我在SandBox中创建了一个真实代码的副本，我仍然无法重现，我想我将不得不从实际代码中添加更多依赖项。

Answer 1

我已经重新创建了你的案例，它可以正常使用以下简单的托管bean

@ManagedBean(name = "bean")
@ViewScoped
public class YourBean implements Serializable {
    List<YourItem> items=new ArrayList<>();
    YourItem anItem=new YourItem();

    @PostConstruct
    public void init() {
        System.out.println("Bean is created");
        //initialize items
        anItem.setSelected(false);
        //add 5 items to list
        for (int i=0;i<5;i++){
            YourItem item=new YourItem();
            item.setSelected(false);
            items.add(item);
        }
    }

    public void onUpdateItems(){
        System.out.println("Items will be updated...");
        anItem.setSelected(true);
        //modify 1st and 3rd item
        items.get(0).setSelected(true);
        items.get(2).setSelected(true);
        //remove 4th item
        items.remove(3);
    }

    public List<YourItem> getItems() {
        return items;
    }

    public void setItems(List<YourItem> items) {
        this.items = items;
    }

    public YourItem getAnItem() {
        return anItem;
    }

    public void setAnItem(YourItem anItem) {
        this.anItem = anItem;
    }
}

p:command应按以下方式实施

          <h:form id="form">
            <h:panelGroup id="itemHolder">
                <h:panelGrid rendered="#{bean.items != null}">
                    <h:selectBooleanCheckbox value="#{bean.anItem.selected}" />
                    <ui:repeat value="#{bean.items}" var="item">
                        <h:selectBooleanCheckbox value="#{item.selected}" />
                        #{item.selected}
                        <br />
                    </ui:repeat>
                </h:panelGrid>
            </h:panelGroup>

            <p:remoteCommand name="startUpdate" 
                             actionListener="#{bean.onUpdateItems()}" 
                             update=":form:itemHolder"/>
            <p:commandButton value="Update items" onclick="startUpdate();"/>
        </h:form>

将您的代码与此示例进行比较。您的托管bean方法很可能存在更新items列表或更新h:panelGroup的方式的问题。

remoteCommand后未设置selectBooleanCheckbox

1 个答案: