嗨，我正在使用PrimeFaces创建一个数据表，其中有1列，该数据表的每一行都包含一个手风琴。我想使用与每行关联的一些输入框中的值更新数据表中的特定行。
当我每行提交表单时首先，永远不会调用 set 属性操作侦听器，并且其次，我正在更新的字段的二传手被多次调用。事实上，它们被称为数据表中的每一行一次。
问题是在调试时，我可以看到无论我正在编辑哪一行，都会为数据表中的所有行调用 setter。因此，除非我正在编辑最后一行，否则我设置的值总是会被覆盖。 任何人都知道这种情况正在发生，因为我认为它每行编辑只会调用一次二传手。
更新：最坏的情况是，我可以通过输入空检查来绕过被调用的setter。 但是我不知道我正在使用哪一行，因为没有调用set属性操作侦听器
JSF 页面
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui"
xmlns:ui="http://java.sun.com/jsf/facelets">
<h:form id="userDetailsForm" style="padding:5px">
<p:growl id="messages" showDetail="true" autoUpdate="true" life="2000"/>
<p:spacer height="15"></p:spacer>
<div class="row">
<div class="col-lg-4">
<div class="input-group">
<p:inputText type="text" styleClass="form-control" value="#{emailArticleBean.searchText}" />
<span class="input-group-btn" style="margin:3px;">
<p:commandButton actionListener="#{emailArticleBean.search}" value="Go!" update=":userDetailsForm:emailArticleTable" />
</span>
</div><!-- /input-group -->
</div><!-- /.col-lg-6 -->
</div><!-- /.row -->
<p:spacer height="15"></p:spacer>
<div class="row">
<div class="col-lg-1">
</div>
<div class="col-lg-11">
<p:dataTable var="email" value="#{emailArticleBean.emailArticles}" scrollRows="20"
scrollable="true" liveScroll="true" scrollHeight="750" id="emailArticleTable"
>
<p:column>
<p:accordionPanel multiple="true" activeIndex="-1" id="panel#{email.id}">
<p:tab title="#{email.headline}" titleStyleClass="email-header">
<div style="clear:both;margin-bottom:10px;">
<h6 style="font-weight:bold;">Summary</h6>
<h:outputText
value="#{email.summary}" />
</div>
<div style="clear:both;margin-bottom:10px;">
<h6 style="font-weight:bold;">Implication</h6>
<h:outputText
value="#{email.implication}" />
</div>
<div style="float:left;clear:both">
<p:commandButton value="View Existing Actions"
oncomplete="PF('dlg2').show();" update=":userDetailsForm:emailActionDialog">
<f:setPropertyActionListener value="#{email}" target="#{emailArticleBean.selectedEmail}" />
</p:commandButton>
</div>
<br/>
<br/>
<div style="margin-top:10px;">
<h:inputTextarea id="accordian1" value="#{emailArticleBean.emailAction}" cols="90" rows="3" />
</div>
<h6 style="font-weight:bold;">Due Date</h6>
<p:calendar value="#{emailArticleBean.actionDueDate}" id="popupCal" pattern="dd MMM, yyyy"/>
<p:commandButton actionListener="#{emailArticleBean.updateAction}" value="Add Action"
style="margin-left:5px;">
<f:setPropertyActionListener value="#{email}" target="#{emailArticleBean.selectedEmail}" />
</p:commandButton>
</p:tab>
</p:accordionPanel>
</p:column>
</p:dataTable>
</div>
</div>
<p:dialog id="emailActionDialog" header="Email Actions" widgetVar="dlg2" modal="true" height="100">
<h3>Email Actions</h3>
<p:dataList value="#{emailArticleBean.selectedEmail.actions}" var="action" itemType="disc">
#{action.action} --- #{action.username}
</p:dataList>
</p:dialog>
</h:form>
</html>
我的背豆
@ManagedBean
@Configurable
@ViewScoped
public class EmailArticleBean implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
@Autowired
EmailArticleService emailArticleService;
private List<EmailArticle> emailArticles;
private String searchText;
private String emailAction;
private EmailArticle selectedEmail;
private Date actionDueDate;
/**
* Using the search term entered will
* query the database and return a list of articles
* that match that parameter
* @param ae
*/
public void search(ActionEvent ae) {
emailArticles = emailArticleService.findEmailArticles(searchText);
}
/**
* add the inputted action to the list of existing actions
* @param ae
*/
public void updateAction(ActionEvent ae) {
selectedEmail.getActions().add(new EmailActions(emailAction, "testUser", actionDueDate));
selectedEmail.merge();
emailAction = "";
actionDueDate = null;
}
public List<EmailArticle> getEmailArticles() {
return emailArticles;
}
public void setEmailArticles(List<EmailArticle> emailArticles) {
this.emailArticles = emailArticles;
}
public String getSearchText() {
return searchText;
}
public void setSearchText(String searchText) {
this.searchText = searchText;
}
public String getEmailAction() {
return emailAction;
}
public void setEmailAction(String emailAction) {
//putting this check in because it the jsf lifecycle
//seems to be calling the setter once for every row overwriting the new value set by the user
if(StringUtils.isEmpty(this.emailAction)) {
this.emailAction = emailAction;
}
}
public EmailArticle getSelectedEmail() {
return selectedEmail;
}
public void setSelectedEmail(EmailArticle selectedEmail) {
if(selectedEmail == null) {
this.selectedEmail = selectedEmail;
}
}
public Date getActionDueDate() {
return actionDueDate;
}
public void setActionDueDate(Date actionDueDate) {
if(this.actionDueDate == null) {
this.actionDueDate = actionDueDate;
}
}
}
您确实将所有行的输入字段的值绑定到同一个 bean 属性。
<p:dataTable var="email" value="#{emailArticleBean.emailArticles}" ...>
...
<h:inputTextarea value="#{emailArticleBean.emailAction}" ... />
从逻辑上讲，这是没有意义的。您描述的症状正是预期的后果。您应该将输入字段的值绑定到当前迭代的行。
<p:dataTable var="email" value="#{emailArticleBean.emailArticles}" ...>
...
<h:inputTextarea value="#{email.emailAction}" ... />