重新创建 ViewScoped bean 而不是调用表单操作

Question

我有一个托管 bean，它是 ViewScoped。在这个 bean 中，我需要发送一个表单（使用 h:commandButton）。这工作正常，除非我更改下拉菜单条目（触发事件并更新页面）。更改下拉菜单的值后，提交表单重新创建 bean（并跳过与 h:commandButton 关联的操作）。

这是我的 XML:

<rich:panel styleClass="panel_grid_center fifty_percent"
        header="Bid matrix">

        <!-- display in case the user is not an admin -->
        <h:panelGroup rendered="#{not loginBean.isAdmin}">

            <h:outputText
                value="You do not have sufficient permission to view this page." />
            <br />
            <h:form>
                <h:commandLink action="index.xhtml"
                    value="Click here to go back to login page / search page." />
            </h:form>
        </h:panelGroup>

        <!-- display if the user is an admin -->
        <h:panelGroup rendered="#{loginBean.isAdmin}"  id="bid_matrices_panel">
                <h:panelGrid columns="2">

                    <!-- customer group panel -->
                    <rich:panel styleClass="contained_width fifty_percent"
                        header="Customer group">
                        <h:form>
                            <h:selectOneMenu
                                valueChangeListener="#{adminBean.onCustomerGroupChangeListener}"
                                value="#{adminBean.customerGroupService.displayCustomerGroup.spendMinimum}">
                                <f:selectItems
                                    value="#{adminBean.customerGroupService.customerGroups}"
                                    var="group" itemLabel="#{group.customerGroupLabel}"
                                    itemValue="#{group.spendMinimum}" />
                                <a4j:ajax event="valueChange" execute="@this"
                                    render="bid_matrices_panel" />
                            </h:selectOneMenu>
                        </h:form>
                    </rich:panel>

                    <!-- repeatables -->
                    <rich:panel styleClass="contained_width fifty_percent"
                        header="Repeatables">
                    </rich:panel>
                </h:panelGrid>

                <h:form>
                    <!-- we loop on each different commoditization (or however that's spelled) -->
                    <a4j:repeat var="bidmatrix_by_commoditization"
                        value="#{adminBean.bidMatrices}">
                        <rich:dataTable styleClass="contained_width"
                            value="#{bidmatrix_by_commoditization.bidMatricesByCoreStatus}"
                            var="matrix_by_core_status">


                            <!-- Display core status -->
                            <rich:column>
                                <f:facet name="header">
                                    <h:outputText
                                        value="#{bidmatrix_by_commoditization.commoditization}" />
                                </f:facet>
                                <h:outputText value="#{matrix_by_core_status.coreStatus}" />
                            </rich:column>

                            <!-- the percentages  -->
                            <c:forEach var="index" begin="0"
                                end="#{adminBean.columnsNumber - 1}">
                                <rich:column>
                                    <f:facet name="header">
                                        <h:outputText value="#{adminBean.columnsHeaders[index]}" />
                                    </f:facet>
                                    <h:inputText
                                        value="#{matrix_by_core_status.bidMatrices[index].percentage}">
                                        <f:convertNumber type="percent" />
                                    </h:inputText>
                                </rich:column>
                            </c:forEach>
                        </rich:dataTable>
                    </a4j:repeat>

                    <br />

                    <!-- update matrix button -->
                    <h:commandButton value="Update" action="#{adminBean.update}" />
                </h:form>
        </h:panelGroup>
    </rich:panel>

我的豆子：

@ManagedBean(name = "adminBean")
@ViewScoped
public class AdminBean implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 5917562235108703019L;

    private CustomerGroupService customerGroupService;
    private BidMatrixDao bidMatrixDao;
    private List<BidMatricesByCommoditization> bidMatrices;

    @PostConstruct
    public void init() {
        customerGroupService = new CustomerGroupService();
        bidMatrixDao = new BidMatrixDaoImpl();
        bidMatrices = bidMatrixDao.getBidMatricesByCustomerGroup(customerGroupService.getDisplayCustomerGroup());
    }

    public void onCustomerGroupChangeListener(ValueChangeEvent v) {
        customerGroupService.setDisplayCustomerGroup((BigDecimal) v.getNewValue());
        bidMatrices = bidMatrixDao.getBidMatricesByCustomerGroup(customerGroupService.getDisplayCustomerGroup());
    }

    public CustomerGroupService getCustomerGroupService() {
        return customerGroupService;
    }

    /**
     * @param customerGroupService
     *            the customerGroupService to set
     */
    public void setCustomerGroupService(CustomerGroupService customerGroupService) {
        this.customerGroupService = customerGroupService;
    }

    /**
     * @return the bidMatrices
     */
    public List<BidMatricesByCommoditization> getBidMatrices() {
        return bidMatrices;
    }

    /**
     * @param bidMatrices
     *            the bidMatrices to set
     */
    public void setBidMatrices(List<BidMatricesByCommoditization> bidMatrices) {
        this.bidMatrices = bidMatrices;
    }

    public int getColumnsNumber() {
        return bidMatrices.get(0).getColumns();
    }

    public List<String> getColumnsHeaders() {
        return bidMatrixDao.getAlignments();
    }

    public void update() {
        bidMatrixDao.updateBidMatrices(bidMatrices);
    }
}

请注意，我从 javax.faces.bean.ViewScoped; 正确导入了 ViewScoped 我还从我的 bean 中删除了 getters/setters，但它们在那里。正如我所说，在不更改 h:selectOneMenu 值的情况下提交表单时工作正常。

谢谢！

编辑：我使用的是 jsf 2.2 (mojarra)、richfaces 4.1 和 wildfly 10.1

Answer 1

我通过移动 ajax 指令中使用的 id 解决了这个问题：

<a4j:ajax event="valueChange" execute="@this" render="bid_matrices_panel" />

我本来是把id放在parent panelGroup里面的，像这样：

<h:panelGroup rendered="#{loginBean.isAdmin}"  id="bid_matrices_panel">

通过围绕我实际想要重新渲染的部分创建 rich:panel，我的问题得到解决：

<h:form>
    <rich:panel id="bid_matrices_panel">
        <! -- my data to render -->

    </rich:panel>

    <h:commandButton value="Update" action="#{adminBean.update}" />
</h:form>

我想重新呈现表单是问题的根源。

很确定我以前尝试过，但那时我也忘记了 implements Serializable 在我的 AdminBean 上...

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