Question

我正在使用primefaces 3.5，我无法弄清楚如何在下一页咆哮消息。例如，我想在数据库中添加一条记录，之后我将重定向到另一个页面，在那里我要显示一条咆哮消息“记录已成功添加！” 我试过这样的事情：

public String addLabelInDB() {
        try {
            //logic to add a record in DB

            FacesContext context = FacesContext.getCurrentInstance();
            context.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Success!", "Label has been added with success!"));

        } catch (Exception e) {
            logger.debug(e.getMessage());
        }
        return "listLabelsPage";
    }

并在listLabelsPage.xhtml中我有：

<p:growl id="msgs" showDetail="true" autoUpdate="true"/>

但它不起作用。我猜这个消息会丢失，因为是另一个请求还是什么？是否有可能根据请求存储消息并在下一页显示？谢谢！

Answer 1

您可以在正在加载的 listLabelsPage.xhtml 页面上设置preRender

<f:event type="preRenderView" listener="#{yourBean.showGrowl}" />

和只有

的showGrowl方法

public void showGrowl() {
  FacesContext context = FacesContext.getCurrentInstance();
  context.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Success!", "Label has been added with success!"));
}

Answer 2

我发布了自己问题的答案，以帮助其他人像我一样面对同样的问题：

public String addLabelInDB() {
        try {
            //some logic to insert in db
            //below I set a flag on context which helps me to display a growl message only when the insertion was done with success
            ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
            ec.getRequestMap().put("addedWithSuccess","true");

        } catch (Exception e) {
            logger.debug(e.getMessage());
        }
        return "listLabelsPage";
    }

    public void showGrowl() {
            ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
            String labelAddedWithSuccess = (String) ec.getRequestMap().get("addedWithSuccess");
           //if the flag on context is true show the growl message
            if (labelAddedWithSuccess!=null && labelAddedWithSuccess.equals("true")) {
                FacesContext context = FacesContext.getCurrentInstance();
                context.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Success!", "Label has been added with success!"));
            }
        }

在我的xhtml中我有：

<f:event type="preRenderView" listener="#{labelsManager.showGrowl}" />

Answer 3

这个怎么样？制作一个单独的重定向按钮，在显示msg后会被点击：

HTML：

<h:form prependId="false">
    <p:growl />
    <p:button outcome="gotoABC" id="rdr-btn" style="display: none;" />
    <p:commandButton action="#{bean.process()}" update="@form" />
</form>

豆：

public void process(){
    addInfoMsg(summary, msgDetail); //Add msg func
    RequestContext.getCurrentInstance().execute("setTimeout(function(){ $('#rdr-btn').click(); }, 3000);"); // 3 seconds delay. I put the script in Constants to config later.
}

如何在下一页显示primefaces咆哮消息？

3 个答案: