動態生成jsf表單問題

Question

我正在嘗試使用jsf和生成表單元素的back bean動態呈現表單。

這是back bean的代碼：

@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;
    }
}

這就是我嘗試使用back bean代碼在視圖（xhtml）中動態生成表單的方式：

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

但表格根本不會生成。 但是，如果我這樣調用它（直接調用該方法以生成表單）：

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

我收到以下錯誤：

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

但是如果以后我嘗試這樣稱呼它：

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

表格呈現了！！

所以我想對象dynamicPanelGrid已填充...

關於如何更改我的代碼以使表單正常工作的任何想法？

Answer 1

dynamicPanelGrid是您的字段名稱（屬性）。 Getter和setter應該如下所示：

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

public HtmlPanelGrid getDynamicPanelGrid() {
    return dynamicPanelGrid;
}

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

閱讀有關Java Bean的信息 。

比綁定屬性應如下所示：

binding="#{reviewReportBean.dynamicPanelGrid}"