如何在下一页显示 primefaces 咆哮消息？

Question

我使用的是 primefaces 3.5，但我不知道如何在下一页上发出消息。例如，我想在数据库中添加一条记录，然后我重定向到另一个页面，我想在该页面上显示带有 "The record has been added with success!" 的咆哮消息我试过这样的事情：

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";
    }

在 listLabelsPage.xhtml 我有：

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

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

Answer 1

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

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

和一个只有

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 post 回答我自己的问题，以帮助像我一样面临同样问题的其他人：

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，显示消息后将被点击：

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>

豆子：

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？

How to show a primefaces growl message on the next page?

jsf

primefaces