Question

我需要你帮助在方言中显示错误信息。通过点击指挥Button,方言中没有显示任何信息。

尽管我试图用方言来显示这一信息,但没有发现任何错误。

因此,我如何用方言而不是主要形式来传递信息。

The following is the JSF page Code:

<h:form id="Requests">
    <p:messages id="messages" showDetail="true" autoUpdate="true" closable="true"/>

    <p:dialog id="c1" header="C1" widgetVar="c1">
        <p:message id="messagePDFSTAR"
                   for=":Requests:DownloadPDFSTAR"
                   showDetail="true" />
        <p:commandButton id="DownloadPDFSTAR"
                         value="Download"
                         ajax="false"
                         actionListener="#{hrd.PDFSTAR}"
                         update=":Requests:messagePDFSTAR" >

            <p:fileDownload value="#{hrd.fileSTAR}" />
        </p:commandButton>
    </p:dialog>
</h:form>

这里是一部 j子法典:

public void PDFSTAR() {

    try {
        FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Ref is Null", "Ref is Null");
        RequestContext.getCurrentInstance().showMessageInDialog(message);
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_FATAL, "Fatal!", "System Error"));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 1

It s because you have ajax=false at the commandButton, so, the attribute update::Requests:messagePDFSTAR isn t going to work. You can t combine ajax=false and update="...", update attribute is only for ajax actions.

我理解你需要<条码>。由于<代码>p:fileDownload与这一条相符合,但或许可以尝试另一种方式显示你想要的信息。

我一度处理这一情况,在<代码>p:dialog 上进行工作。页: 1

<h:form id="Requests">
    <p:messages id="messages" showDetail="true" autoUpdate="true" closable="true"/>

    <p:dialog id="c1" header="C1" widgetVar="c1">
        <p:messages id="messagesPDFSTAR"
                    autoUpdate="true"
                   showDetail="true" />
        <p:commandButton id="DownloadPDFSTAR"
                         value="Download"
                         ajax="false"
                         actionListener="#{hrd.PDFSTAR}" >

            <p:fileDownload value="#{hrd.fileSTAR}" />
        </p:commandButton>
    </p:dialog>
</h:form>

我希望这将有助于你。

<><>Edit>:

RequestContext.getCurrentInstance().showMessageInDialog(message);

它用新的方言显示这一信息,但我认为它不是你想要的。请在<代码>commandButton <>/code>和上显示这一信息。



 Ajax和增编没有正确操作

Answer 2

更新内容如下:p:growl <>/code>或p:messages 下载后,或甚至在开始时仅使用p:remoteCommand和PrimeFaces.monitorDownload(start, end);,载于以下实例:。 PrimeFaces 文档下载例


我是这样做的:
<script type="text/javascript">
    function start() {
        PF( statusDialog ).show();
        //maybe some other blah blah..
        updateMyMessages();
    }

    function stop() {
        PF( statusDialog ).hide();
        //maybe some other blah blah..
        updateMyMessages();
    }
</script>

<div class="card">
    <p:dialog modal="true" widgetVar="statusDialog" header="Status" draggable="false" closable="false"
              resizable="false">
              <i class="pi pi-spinner pi-spin" style="font-size:3rem"></i>
    </p:dialog>

    <h:form>
        <p:messages id="messagesPDFSTAR"/>
        <p:remoteCommand name="updateMyMessages" update="messagesPDFSTAR" action="#{hrd.PDFSTAR}"/>
        <p:commandButton value="Download" ajax="false" onclick="PrimeFaces.monitorDownload(start, stop);"
                         icon="pi pi-arrow-down" styleClass="p-mr-2">
            <p:fileDownload value="#{fileDownloadView.file}"/>
        </p:commandButton>
</div>

Please note that I called the remote command twice so you get two updates to your messages, also this will execute your action #{hrd.PDFSTAR} twice, once on download start and the other on download finish, so modify as you see fit.
You can always upgrade to PrimeFaces 10+ and use ajax="true" (the default) on the download command button.

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