我在给表单添加p:remoteCommand时遇到了问题。代码大致如下:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.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:util="http://java.sun.com/jsf/composite/components/util"
xmlns:c="http://java.sun.com/jsp/jstl/core" xmlns:fn="http://java.sun.com/jsp/jstl/functions"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Reset Test</title>
<link type="text/css" rel="stylesheet" href="/treetable-sscce/css/example.css" />
<h:outputScript library="primefaces" name="jquery/jquery.js"/>
</h:head>
<div class="box">
<h2>Box</h2>
<h:panelGroup id="mypanel">
Headline: <h:outputText value="#{resetBean.headline}" />
<br/>
Message : <h:outputText value="#{resetBean.message}" />
<br/>
</h:panelGroup>
</div>
<div class="box">
<h2>Form</h2>
<h:form id="myform" acceptcharset="utf-8">
<p:growl id="growl" showDetail="true" sticky="false" severity="info, warn" />
<!-- register custom validate event -->
<f:event listener="#{resetBean.validateForm}" type="postValidate" />
<p:remoteCommand name="resetByEscape" action="#{resetBean.resetAction}"
immediate="true" update=":myform :mypanel" />
<h:outputLabel for="headline">Meldungsüberschrift</h:outputLabel>
<h:inputText id="headline" value="#{resetBean.headline}" />
<br/>
<h:outputLabel for="message">Meldungsüberschrift</h:outputLabel>
<h:inputTextarea id="message" value="#{resetBean.message}" />
<br/>
<h:commandButton action="#{resetBean.resetAction}"
value="Reset" immediate="true" onclick="resetForm()"/>
<h:commandButton action="#{resetBean.submitAction}" value="Submit" immediate="false"/>
</h:form>
</div>
<script type="text/javascript"></script>
</html>
以下是Bean代码:
package de.example.beans;
import java.io.Serializable;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.event.ComponentSystemEvent;
import javax.faces.validator.ValidatorException;
import org.apache.log4j.Logger;
@ViewScoped
@ManagedBean
public class ResetBean implements Serializable
{
private static final long serialVersionUID = 7282752623428425109L;
private static final Logger log = Logger.getLogger(ResetBean.class);
protected String headline = null;
protected String message = null;
public ResetBean() {
log.error("ResetBean");
}
@PostConstruct
public void postConstruct() {
log.error("postConstruct");
}
@PreDestroy
public void preDestroy() {
log.error("preDestroy");
}
public void resetAction() {
log.error("resetAction");
headline = null;
message = null;
}
public void submitAction() {
log.error("submitAction headline="+headline+" message="+message);
}
public void validateForm(ComponentSystemEvent event) throws ValidatorException {
log.error("validateForm");
}
public String getHeadline() {
return headline;
}
public void setHeadline(String headline) {
this.headline = headline;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
h:command
按钮和p:remoteCommand
以相同的方式执行相同的操作。区别是,h:command
按钮响应鼠标单击,而按ESC键会通过javascript触发p:remoteCommand
。
问题在于,通过p:remoteCommand
的路由似乎会破坏后端bean(该bean为@ViewScoped
)。但是,@PreDestroy
注释的方法从未被调用,然而:在使用p:remoteCommand
后,页面上的下一个动作将强制重新创建组件!将调用默认构造函数和@PostConstruct
。现在自然缺少一些重要参数,整个视图都变得混乱。
你有任何想法吗?为什么在这种情况下p:remoteCommmand
和h:commandButton
之间有差异?有没有解决问题的机会?
p:remoteCommand
有关的问题,因为该问题似乎与所有键相关,而不仅仅是ESC。也许你应该在PF论坛上开一个帖子... - Aritz