PrimeFaces民意测验不起作用 [英] PrimeFaces poll does not work
问题描述
我需要在其他一些工作中使用<p:poll />.所以我尝试了PrimeFaces ShowCase代码:-
I need to use <p:poll /> in some other work. So I was trying out the PrimeFaces ShowCase code:-
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:rich="http://richfaces.org/rich"
xmlns:p="http://primefaces.prime.com.tr/ui"
xmlns:a4j="http://richfaces.org/a4j">
<h:form>
<h:outputText id="txt_count" value="#{counterView.number}" />
<p:poll interval="3" listener="#{counterView.increment()}" update="txt_count" />
</h:form>
</html>
支持bean如下:-
package com.poll;
import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
@ManagedBean (name="counterView")
@ViewScoped
public class CounterView implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private int number;
public int getNumber() {
return number;
}
public void increment() {
number++;
System.out.println(number);
}
}
它是这样工作的:在浏览器中，number显示为0，并且没有变化.在控制台中，我可以看到它一次打印为1，然后什么也不打印.
It works as such: in browser number shows as 0 and doesn't change. In console I can see it printing as 1 once and then nothing.
这是怎么了?我在JSF 2.1上使用PrimeFaces 3.4.2
What is wrong here? I am using PrimeFaces 3.4.2 on JSF 2.1
推荐答案
p:poll标记对我有用，具有以下内容，并且我在Primefaces 5.2上.
The p:poll tag does work for me with the following content, and I am on Primefaces 5.2.
注意::<h:head/>标签是必需的，没有它，它会加载所需的与primefaces相关的js文件.我认为这是您的情况下刷新无法正常工作的原因.
NOTE: <h:head/> tag is needed and without that it does load primefaces related js files that are needed. I believe that is the reason why the refresh is not working in your case.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head/>
<h:body>
<h:form>
<h:outputText id="txt_count" value="#{counterView.number}" />
<p:poll interval="3" listener="#{counterView.increment}" update="txt_count" />
</h:form>
</h:body>
</html>
和托管bean:
@ManagedBean(name="counterView")
@ViewScoped
public class CounterView implements Serializable {
private int number = 100;
public int getNumber() {
return number;
}
public void increment() {
System.out.println("Incrementing....");
number++;
}
}
您可以尝试一下并比较是否可行.
Can you try with these and compare if it works.
更新:最终解决方案
要总结解决方案，请使用<h:head/>标记，如评论部分所述，升级到Primefaces的较新版本(5.x)可以解决此问题.
To summarize the solution, along the <h:head/> tag, upgrading to newer version (5.x) of Primefaces helped resolve the issue, as indicated in the comments section.
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