使用Confirm Dialog将值从数据表传递给bean JSF

Question

我在将数据表中的单个值传递给backingbean时遇到了问题。当我试图在确认对话框中的方法中打印它时，我总是得到值0，但当我尝试在命令按钮中的方法中将它打印出来时，它会显示我需要的值。我认为它重置了价值或其他什么。

<p:dataTable id="labLists" var="lab" value="#{coltsysHome.laboratory}" >
  .....
  <p:column headerText=" ">
        <p:commandButton value="DELETE" onclick="confDlg.show()" icon="ui-icon-closethick" action="#{coltsysHome.action}">
                <f:setPropertyActionListener value="#{lab.lab_id}" target="#{coltsysHome.lab_id_del}" />
         </p:commandButton>
   </p:column>   

对于确认对话框：

<p:confirmDialog widgetVar="confDlg" header="DELETE LABORATORY" message="Are you sure you want to delete this lab?">
   <h:form id="delDlgForm">
           <p:commandButton id="confirm" value="Yes Sure" oncomplete="confDlg.hide()" actionListener="#{coltsysHome.deleteLab(event)}"/> 
            <p:commandButton id="decline" value="Not Yet" onclick="confDlg.hide()" type="button" /> 
    </h:form>

Bean(RequestScoped(:

...getter and setter (lab_id_del)
public void deleteLab(ActionEvent event) {
    FacesContext context = FacesContext.getCurrentInstance();
    String cpath = context.getExternalContext().getRequestContextPath();
    try (Connection conn = dataSource.getConnection()) {
        ColtsysDAO coltsysDAO = new ColtsysDAO(conn);
        coltsysDAO.deleteLab(lab_id_del, coltsysDAO.getUserID(getUser_name()));
    } catch (Exception e) {
        e.printStackTrace(System.err);
    }
}
public void action() {
    System.out.println("lab_id_del: " + lab_id_del);
}

Answer 1

您需要做的第一个也是最重要的更改是：如Luiggi Mendoza所建议的RequestScoped->ViewScoped。您可能需要使用p:dataTable的id将process属性添加到p:commandButton。此外，您可以将lab对象直接传递到action方法中，而无需将f:setPropertyActionListener用作：action="#{coltsysHome.action(lab)}"，并将其作为：public String action(Lab lab)。为什么不actionListener！