java - 动态生成jsf表单问题

Question

我正在尝试使用 jsf 和生成表单元素的 back bean 动态渲染表单。

这是后台bean的代码:

@ManagedBean(name = "reviewReportBean")
@SessionScoped
public class ReviewReportBean implements Serializable {
... ... ...
private HtmlPanelGrid dynamicPanelGrid;
... ... ...
public HtmlPanelGrid dynamicPanelGrid() {
Application application = FacesContext.getCurrentInstance().getApplication();
List childrenList = dynamicPanelGrid.getChildren();
childrenList.clear();
... ... ...
Session session = HibernateUtil.getSessionFactory().openSession();
    Transaction tx = null;
    try 
    {
    ... ... ...     
    HtmlOutputLabel label = (HtmlOutputLabel)application.createComponent(HtmlOutputLabel.COMPONENT_TYPE);
    label.setValue("Mpla Mpla Mpla");
    ... ... ...         
    childrenList.add(label);
    ... ... ...     
    String hq9 = "select ... WHERE it (:itid)";
    SQLQuery query9 = session.createSQLQuery(hq9);
    query9.setParameter("itid",imageTypeId);
    query9.addEntity(ReportFormFields.class);
    reportFormFields = query9.list();
    for(int i=0; i<reportFormFields.size(); i++){
        System.out.println("-------------------------");
        System.out.println(">> Field Id: " + reportFormFields.get(i).getRffFieldId());
        System.out.println(">> Field Name: " + reportFormFields.get(i).getRffFieldName());
        ... ... ...

        HtmlOutputLabel output = (HtmlOutputLabel)application.createComponent(HtmlOutputLabel.COMPONENT_TYPE);
        output.setValue(reportFormFields.get(i).getRffFieldLabel());
        childrenList.add(output);
        if(reportFormFields.get(i).getRffFieldType().equals("Option List")){
            HtmlSelectOneMenu combomenu = (HtmlSelectOneMenu)application.createComponent(HtmlSelectOneMenu.COMPONENT_TYPE);
            UISelectItems comboItems = new UISelectItems();
            String listOptions =reportFormFields.get(i).getRffFieldOptions();
            String array[] = listOptions.split("(?<!\\\\),");

            for(int j = 0;j<array.length;j++){
                System.out.println(">>> list option " + j + " is " + array[j]);
            }
            comboItems.setValue(array);
            combomenu.getChildren().add(comboItems);
            childrenList.add(combomenu);

            }else{
                HtmlInputText input = (HtmlInputText)application.createComponent(HtmlInputText.COMPONENT_TYPE);
                childrenList.add(input);
            }
            ... ... ...
        }
        ... ... ...
    }
    ... ... ...
    return dynamicPanelGrid;
    }
}

这就是我尝试使用 back bean 代码在我的 View (xhtml) 中动态生成表单的方法:

<h:panelGrid id="dynaPanelGrid7" 
binding="#{reviewReportBean.dynamicPanelGrid}" >
</h:panelGrid>

但是表单根本没有生成。但是，如果我这样调用它(直接调用该方法以生成表单):

<h:panelGrid id="dynaPanelGrid7" 
binding="#{reviewReportBean.dynamicPanelGrid()}" >
</h:panelGrid>

我收到以下错误:

can't parse argument number reviewReportBean.dynamicPanelGrid(): /views/view.xhtml @199,63 binding="#{reviewReportBean.dynamicPanelGrid()}": Illegal Syntax for Set Operation

但如果随后我尝试这样调用它:

<h:panelGrid id="dynaPanelGrid7" 
binding="#{reviewReportBean.dynamicPanelGrid}" >
</h:panelGrid>

表单已呈现!!

所以我猜对象dynamicPanelGrid已填充...

关于如何更改我的代码以使表单正常工作有什么想法吗？

Answer 1

dynamicPanelGrid 是您的字段(属性)的名称。 Getter 和 setter 应该如下所示:

@PostConstruct
public void init() {
    // init your dynamicPanelGrid
}

public HtmlPanelGrid getDynamicPanelGrid() {
    return dynamicPanelGrid;
}

public void setDynamicPanelGrid(HtmlPanelGrid dynamicPanelGrid) {
    this.dynamicPanelGrid = dynamicPanelGrid;
}

了解Java Beans .

你的绑定(bind)属性应该如下所示:

binding="#{reviewReportBean.dynamicPanelGrid}"