如何在 p:tabView 组件中动态添加和删除选项卡

问题描述

我正在尝试动态添加 PrimeFaces .在添加第二个选项卡时，我收到以下异常:

I am trying to add a PrimeFaces <p:tab> dynamically. While adding the second tab I am getting the following exception:

java.lang.IllegalStateException:已在视图中找到组件 ID tab0".

"java.lang.IllegalStateException: Component ID tab0 has already been found in the view".

我该如何解决这个问题?

How can I solve this?

这是查看代码:

<h:form prependId="false">
    <p:tabView id="tabview" dynamic="true" cache="false" 
        binding="#{testBean.tabView}" 
        activeIndex="#{testBean.activeTab}" >  
        <h:commandButton value="Close" action="#{testBean.removeTab}"/>
    </p:tabView>  
    <h:commandButton value="Add Tab" action="#{testBean.addTab}"/>
</h:form>

这里是bean代码:

public String addTab() {
    String tabId="tab"+id;
    System.out.println("Gen Id: "+tabId);
    tab = new Tab();
    tab.setTitle("Title: "+tabId);
    tab.setId(tabId);

    System.out.println("Tab Id: "+tab.getId());
    tabView.getChildren().add(id,this.tab);
    id++;
    return "tabtest.jsf";
}

public String removeTab() {
    tabView.getChildren().remove(activeTab);
    return "tabtest.jsf";
}

推荐答案

如果一切都可以在视图中完成，请不要手动创建组件.如果 bean 的范围比请求范围更广，则此构造将失败.另见例如绑定属性导致在视图中发现重复的组件 ID

Don't manually create components if everything can just be done in the view. This construct will fail if the bean is in a broader scope than the request scope. See also e.g. Binding attribute causes duplicate component ID found in the view

按照展示示例TabView with Model"，您可以通过健全的模型和 <p:tabView value="..." var="..."> 像 <ui:repeat> 一样动态填充选项卡>/.

Follow the showcase example "TabView with Model" which allows you to dynamically populate tabs via a sane model and <p:tabView value="..." var="..."> like as <ui:repeat>/<h:dataTable>.

例如此视图

<h:form>
    <p:tabView value="#{bean.tabs}" var="tab">  
        <p:tab title="#{tab.title}">
            #{tab.content}
            <p:commandButton value="Close" action="#{bean.remove(tab)}" update="@form" />
        </p:tab>
    </p:tabView>  
    <p:commandButton value="Add Tab" action="#{bean.add}" update="@form" />
</h:form>

使用这个控制器

@ManagedBean
@ViewScoped
public class Bean implements Serializable {

    private List<Tab> tabs;

    @PostConstruct
    public void init() {
        tabs = new ArrayList<>();
    }

    public void add() {
        tabs.add(new Tab("tab" + tabs.size(), "some content"));
    }

    public void remove(Tab tab) {
        tabs.remove(tab);
    }

    public List<Tab> getTabs() {
        return tabs;
    }

}

还有这个模型

public class Tab {

    private String title;
    private String content;

    public Tab(String title, String content) {
        this.title = title;
        this.content = content;
    }

    public String getTitle() {
        return title;
    }

    public String getContent() {
        return content;
    }

}