Question

我被要求编写一个处理结果分页的JSF组件。该组件接受实现接口的bean。在运行时，调用getter方法，但从不调用setter。这是代码

<cc:interface>
    <cc:attribute name="pagableResultsBean" />
</cc:interface>

<!-- Question: We can't have a form inside of a form. Do we ecapsulate form operations here or 
    should the client handle them? -->
<cc:implementation>
    <c:set var="pagableResultsBean" value="#{cc.attrs.pagableResultsBean}" />
    <div
        style="background-color: #F0F3FA; border: 1px solid #ABABAB; height: 25px; margin: 0px; padding: 2px 8px; position: relative; vertical-align: middle;">
        <h:panelGroup>
            <div style="float: left; width: auto;">
                Showing Results <h:outputLabel value="#{pagableResultsBean.showingRecordMin}" />  - <h:outputLabel value="#{pagableResultsBean.showingRecordMax}" /> of
                #{pagableResultsBean.totalRecordsNum} Results per Page:
                <h:selectOneMenu value="#{pagableResultsBean.resultsPerPage}" onchange="$j(document).find('.pageBarSubmitBtn').click();">
                    <f:selectItems value="#{pagableResultsBean.resultsPerPageItems}" />
                </h:selectOneMenu>
            </div>
            <div style="float: right; width: auto;">
                Showing Page #{pagableResultsBean.currentPageNum} of #{pagableResultsBean.totalPagesNum} Jump
                to Page
                <h:selectOneMenu id="_pagesMenu" value="#{pagableResultsBean.currentPageNum}" onchange="$j(document).find('.pageBarSubmitBtn').click();">
                    <f:selectItems value="#{pagableResultsBean.resultsPerPageItems}" />
                </h:selectOneMenu>

                <h:commandLink style="position: relative; top: 3px;" action="#{pagableResultsBean.goToFirstPage()}"> 
                    <h:graphicImage value="/images/arrow-first.gif" />
                </h:commandLink>
                <h:commandLink style="position: relative; top: 3px;" action="#{pagableResultsBean.goToPreviousPage()}">
                    <h:graphicImage value="/images/arrow-previous.gif" />
                </h:commandLink>
                <h:commandLink style="position: relative; top: 3px;" action="#{pagableResultsBean.goToNextPage()}">
                    <h:graphicImage value="/images/arrow-next.gif" />
                </h:commandLink>
                <h:commandLink style="position: relative; top: 3px;" action="#{pagableResultsBean.goToLastPage()}">
                    <h:graphicImage value="/images/arrow-last.gif" />
                </h:commandLink>

            </div>
            <h:commandButton style="visibility: hidden;" styleClass="jsfHidden pageBarSubmitBtn"/>
        </h:panelGroup>
    </div>
</cc:implementation>

这是支持bean实现的接口：

public interface PagableResults {
    public int getShowingRecordMin();
    public int getShowingRecordMax();

    public ResultsPerPage getResultsPerPage();
    public void setResultsPerPage(ResultsPerPage rpp);

    public int getCurrentPageNum();
    public void setCurrentPageNum(int pageNum);

    public int getTotalPagesNum();
    public int getTotalRecordsNum();

    public List<SelectItem> getResultsPerPageItems();
    public List<SelectItem> getResultsPagesItems();

    public void goToFirstPage();
    public void goToLastPage();
    public void goToPreviousPage();
    public void goToNextPage();
}

以下是使用控件的代码段

<h:form>
    <ndar:pagingBar pagableResultsBean="#{pageBean}" />
</h:form>

任何人都可以看到为什么只有被吸引者被召唤而不是被设定者？

Answer 1

当您似乎使用JSP JSTL核心标记库中的c:set时，这可能不适用于JSF，尤其是JSF Composite Component系统。

您是否尝试将pagableResultsBean的所有实例替换为cc.attrs.pagableResultsBean，因为这样可以消除错误的一个可能原因？

另外，将调试器放在你认为没有被调用的set-method上 - 并验证它是否真的没有被调用，或只是html结果看起来像。

更新2014-12-31

还要确保为jsf添加h:messages标记，以确保JSF告诉您可能的转换错误。

JSF只调用getter但从不调用Composite Component

1 个答案: