Rendering table h:dataTable with f:ajax when select h:selectOneMenu confuses f:validateLength
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【中文标题】Rendering table h:dataTable with f:ajax when select h:selectOneMenu confuses f:validateLength【英文标题】： 【发布时间】：2015-08-02 09:15:00 【问题描述】：试图解决这个问题。
如果我单击添加主题按钮，必填消息将显示在字段名称中。但是，如果我选择部门并再次单击添加主题，则不会显示所需的消息！
如果我删除 ajax 调用：
f:ajax event="valueChange" render="topics"
有效！但是，然后，选择元素时，我不会更新我的表。 有没有办法在没有 ajax 调用的情况下更新表？还是我做错了什么？
另外，如果调用了 ajax，TopicBean 中的 showMessageInDialog 将不再起作用...
topics.xhtml
<?xml version='1.0' encoding='UTF-8' ?>
<!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://xmlns.jcp.org/jsf/facelets"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<h:outputStylesheet name="./css/pure-release-0.6.0/pure-min.css"/>
<h:outputStylesheet name="./css/pure-release-0.6.0/grids-responsive-min.css"/>
<title>Company</title>
</h:head>
<h:body>
<h:form id="divisions_list" class="pure-form pure-form-stacked" enctype="multipart/form-data" style="margin: 15px">
<div>
<img src="images/logo.png" />
<br/><br/>
</div>
<fieldset>
<div class="pure-g">
<legend style="margin-top: 15px">Filters</legend>
<div class="pure-u-1 pure-u-md-1-3">
<label for="divisions">Division Name:</label>
<h:selectOneMenu id="divisions" value="#TopicsBean.topic.division.id">
<f:selectItem itemLabel="Select..." itemValue="-1" />
<f:selectItems value="#TopicsBean.divisions" var="division" itemValue="#division.id" itemLabel="#division.name" />
<f:ajax event="valueChange" render="topics" />
</h:selectOneMenu>
</div>
<legend style="margin-top: 15px">Topic List</legend>
<div class="pure-table">
<h:dataTable id="topics" value="#TopicsBean.topics" var="topics_list">
<h:column >
<f:facet name="header">#</f:facet>
<h:outputText value="#topics_list.id"/>
</h:column>
<h:column>
<f:facet name="header">Name</f:facet>
<h:outputText value="#topics_list.name"/>
</h:column>
</h:dataTable>
</div>
<legend style="margin-top: 15px">Add Topic</legend>
<div class="pure-u-1 pure-u-md-1-3">
<label for="topic_name">Name:</label>
<h:inputText id="topic_name" size="30" maxlength="50" value="#TopicsBean.topic.name" validatorMessage="required" immediate="true">
<f:validateLength minimum="3" />
</h:inputText>
<h:message for="topic_name" style="color:red" showSummary="false"/>
</div>
<legend style="margin-top: 15px"></legend>
<br/>
<h:commandButton id="addTopic" value="Add Topic" action="#TopicsBean.addTopic" class="pure-button pure-button-primary"/>
</div>
</fieldset>
</h:form>
<p:dialog id="errorID" widgetVar="errorVar">
<h:form id="errorForm">
<p:commandButton value="OK" type="button" onclick="errorID.hide()" />
</h:form><br/>
</p:dialog>
</h:body>
</html>
TopicsBean.java
import buildgc.jdbc.DBConnection;
import buildgc.model.Company;
import buildgc.model.Division;
import buildgc.model.Topic;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import org.primefaces.context.RequestContext;
@ManagedBean(name="TopicsBean")
@SessionScoped
public class TopicsBean implements Serializable
private Division division;
private Topic topic;
private List<Division> divisions = new ArrayList<Division>();
private List<Topic> topics = new ArrayList<Topic>();
public TopicsBean()
defaultValues();
public void defaultValues()
this.division = new Division();
this.topic = new Topic();
public void addTopic()
if(this.topic.getDivision().getId() == -1)
FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_ERROR, "Missing data", "Please select a Division.");
RequestContext.getCurrentInstance().showMessageInDialog(message);
return;
if(DBConnection.getInstance().saveTopic(this.topic))
FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Success", "Topic successfully added.");
RequestContext.getCurrentInstance().showMessageInDialog(message);
this.topic = new Topic();
else
FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_FATAL, "Error", "Please contact the administrator.");
RequestContext.getCurrentInstance().showMessageInDialog(message);
public Division getDivision()
return division;
public void setDivision(Division division)
this.division = division;
public List<Company> getCompanies()
return DBConnection.getInstance().getCompanies();
public List<Division> getDivisions()
return DBConnection.getInstance().getDivisions();
public List<Topic> getTopics()
return DBConnection.getInstance().getTopics(this.topic.getDivision());
public Topic getTopic()
return topic;
public void setTopic(Topic topic)
this.topic = topic;
【问题讨论】：
【参考方案1】：如果有人遇到同样的问题，我找到了一个简单的解决方案...... 而不是使用：
<f:ajax event="valueChange" render="topics" />
用途：
<p:ajax event="valueChange" update="topics" />
这解决了我两个问题：
-
f:validateLength @topics.xhtml 工作正常
FacesMessage (showMessageInDialog) 工作正常@TopicsBean.java
【讨论】：
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