JSF DocumentViewer无法在@ViewScope中显示PDF

发布于 2025-01-25 01:19:52 字数 639 浏览 3 评论 0 原文

我对JSF是相对较新的，因此需要一些帮助。
问题：我有显示PDF的网页。因此，我创建了一个XHTML，如以下

<p:panel rendered="#{mainAppView.getMessages().isEmpty()}" styleClass="preview-panel">
    <div class="document-viewer-wrapper">
        <pe:documentViewer
            url="#{previewView.previewUrl}"
            download="Document.pdf"
            id="pdfPreview"/>
    </div>
</p:panel>

URL由BackingBean PreviewView提供。因此，当JSF试图显示该文档时，它会致电WebServlet。 WebServlet下载文档并显示该文档，如果未下载，则在DocumentViewer上显示了错误消息。

有没有办法通知ViewScope Bean有关故障的信息？如果文档下载失败，我想在屏幕上禁用一个选项卡。我读到Servlet无法打电话给ViewScope Bean。

原文

I am relatively new to JSF thus need some help.
Problem: I have webpage that displays a PDF. Thus I created a xhtml as follow

<p:panel rendered="#{mainAppView.getMessages().isEmpty()}" styleClass="preview-panel">
    <div class="document-viewer-wrapper">
        <pe:documentViewer
            url="#{previewView.previewUrl}"
            download="Document.pdf"
            id="pdfPreview"/>
    </div>
</p:panel>

URL is provided by a BackingBean previewView. Thus when the jsf tries to display the document, it makes a call to WebServlet. The WebServlet downloads the document and displays it and if it fails to download, an error message is shown on the DocumentViewer.

Is there a way to I can notify the ViewScope Bean about the failure? I want to disable a tab on the screen if the document download fails. I read that servlet can't make call to viewScope Bean.

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