JS 功能未通过 PrimeFaces.monitorDownload 触发 [英] JS function not triggered with PrimeFaces.monitorDownload

查看：14 发布时间：2021/12/31 10:16:19 jsf jsf-2 primefaces

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问题描述

我正在使用 Primefaces 4.0 进行文件下载.我只想在下载完成时触发一个 JS 函数，但似乎不起作用(在 Firefox 和 Google Chrome 中尝试过).我的测试用例看起来类似于在 PF 文档中所做的:>

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"xmlns:f="http://java.sun.com/jsf/core"xmlns:h="http://java.sun.com/jsf/html"xmlns:ui="http://java.sun.com/jsf/facelets"xmlns:p="http://primefaces.org/ui"><h:头/><h:body><script type="text/javascript">函数开始消息(){alert("下载开始了！");}函数完成消息(){alert("下载完成！");}<h:形式><p:commandButton value="下载"ajax="false"icon="ui-icon-arrowreturnthick-1-s"onclick="PrimeFaces.monitorDownload(startMessage, finishMessage)"><p:fileDownload value="#{bean.file}"/></p:commandButton></h:form></h:body>

@ManagedBean@ViewScoped公共类 Bean 实现了 Serializable {公共流内容 getFile() {返回新的 DefaultStreamedContent(new ByteArrayInputStream(new byte[0]));}}

警报会在下载开始时触发，但不会在下载完成时触发.其他人可以试试吗?

解决方案

这是一个错误

一>.

主要错误在org.primefaces.component.filedownload包的FileDownloadActionListener.

第 65 行

externalContext.addResponseCookie(Constants.DOWNLOAD_COOKIE, "true", Collections.emptyMap());

Constants.DOWNLOAD_COOKIE 是primefaces.download"，它永远不会与响应一起发送.

这会导致 PrimeFaces.monitorDownload 的 Interval 永远不会调用停止函数，因为 cookie 永远不会被写入.

I'm working in file downloading with Primefaces 4.0. I just want to trigger a JS function when download completes, but seems not to work (tried in Firefox and Google Chrome). My test case looks similar to what's done in the PF docs:

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui">
<h:head />

<h:body>
    <script type="text/javascript">
        function startMessage() {
            alert("Download started!");
        }
        function finishMessage() {
            alert("Download finished!");
        }
    </script>
    <h:form>
        <p:commandButton value="Download" ajax="false"
            icon="ui-icon-arrowreturnthick-1-s"
            onclick="PrimeFaces.monitorDownload(startMessage, finishMessage)">
            <p:fileDownload value="#{bean.file}" />
        </p:commandButton>
    </h:form>
</h:body>
</html>

@ManagedBean
@ViewScoped
public class Bean implements Serializable {

    public StreamedContent getFile() {
        return new DefaultStreamedContent(new ByteArrayInputStream(new byte[0]));
    }

}

The alert is triggered when download starts, but not when download finishes. Could anyone else give it a try?

解决方案

it's a bug.

The main bug is in FileDownloadActionListener of org.primefaces.component.filedownload package.

Line 65

externalContext.addResponseCookie(Constants.DOWNLOAD_COOKIE, "true", Collections.<String, Object>emptyMap());

The Constants.DOWNLOAD_COOKIE is "primefaces.download", and it's never sent with the response.

That would cause PrimeFaces.monitorDownload's Interval to never call the stop function, since the cookie is never written.

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